Introduction. Polyurethane is a water or oil-based polymeric compound used to coat or polish wood. BASF and Dow Chemical introduced polyalkylene glycols in 1957. [7] Polyisocyanates became commercially available in 1952, and production of flexible polyurethane foam began in 1954 by combining toluene diisocyanate (TDI) and polyester polyols. Interest in sustainable "green" products raised interest in polyols derived from vegetable oils. [12][27][28][29][30] [32], Factors affecting catalyst selection include balancing three reactions: urethane (polyol+isocyanate, or gel) formation, the urea (water+isocyanate, or "blow") formation, or the isocyanate trimerization reaction (e.g., using potassium acetate, to form isocyanurate rings). Polyurethane (PU) This site needs JavaScript to work properly. The appropriate use of a light stabilization system can inhibit UV induced reactions that negatively affect the adhesive and furthermore, increase the service life of the adhesive. [citation needed] Resin blend additives may include chain extenders, cross linkers, surfactants, flame retardants, blowing agents, pigments, and fillers. Dispense equipment consists of material holding (day) tanks, metering pumps, a mix head, and a control unit. Once melted, they are then pressed or injection molded into a final product. Waterborne and solventborne polyurethane systems, Polymeric nanocomposites, Acrylic emulsions, Synthetic resins, Formulation and application of paints and coatings, . In Europe the meanings for 'A-side' and 'B-side' are reversed. Overall, most buyers agree that the finish suits best, and no one questions it. The quantum efficiency of spectral UV on photodegration of an acrylic-urethane coating has been investigated. Polyurethane (PUR) is a polymer derived from the condensation of polyisocyanate and polyol and it is widely used as a base material in various industries. and their proper degradation behavior match the healing process of the fractured . HHS Vulnerability Disclosure, Help [52], Microbial degradation of polyurethane is believed to be due to the action of esterase, urethanase, hydrolase and protease enzymes. and transmitted securely. This is designed for outdoor use and makes sure its oil-based. It is a well-known phenomenon, which is typically attributed to the photochemical degradation of the polyurethane, caused by UV irradiation [22]. Protective esc coating lasts longer, less work water clean-up, fast dry, low odor, maximum protection for exterior doors, furniture and boats lasts twice as long as exterior oil-based finishes used on exterior doors, furniture and boats satin finish 1 quart. Because of these complications, the extrapolation of research findings on UV-induced degradation of pure polymer resins to compounded and processed products of the same . Polyurethane applications for the vibrating needle curemeter. FOIA Int J Mol Sci. This will act as a preservative for the original finish. To ensure consistent quality, the extrusion lines are located . B. Ravat, M. Grivet, A. Chambaudet, Evolution of the degradation and oxidation of polyurethane versus the electron irradiation parameters: Fluence, flux and temperature, Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 10.1016/S0168-583X(01)00571-7, 179, 2, (243-248), (2001). The finish is food safe and it has excellent results. Add-ons to dispense equipment include nucleation or gas injection units, and third or fourth stream capability for adding pigments or metering in supplemental additive packages. This was made in Ontario and installed in various regions from the Yukon territories to Panama. If exposed to UV rays, the cells of a Foam Roofing System will gradually degrade one layer of microscopic polyurethane cells at a time. Propylene oxide and/or ethylene oxide is added to the initiators until the desired molecular weight is achieved. Two-component fluorinated polyurethanes prepared by reacting FEVE fluorinated polyols with polyisocyanate have been used to make ambient cure paints and coatings. Linear fibers were produced from hexamethylene diisocyanate (HDI) and 1,4-Butanediol (BDO). H The .gov means its official. This paper presents an experimental study about the effects of UV irradiation on polyether polyurethane (PU) fibers investigated by FTIR, SAXS and AFM, and the multiple mechanism is finally proposed.The results show that, at low UV irradiation (0.6W/m2, .9W/m2), the mechanism responsible for UV degradation of polyether PU fibers could be An official website of the United States government. The best part: Minwax Uv Cured Polyurethane Finish costs comparatively little and it is available to ship in 24 hours. Styrenics. Fully reacted polyurethane polymer is chemically inert. Further, they strongly agree that this finish is holding up much better. The concentration and organization of these polyurea phases can have a significant impact on the properties of the foam. Almost all buyers quickly discovered that the finish is well worth the investment. Stabilization strategies for weatherable PU. The choice of mold-making material is dependent on the expected number of uses to end-of-life (EOL), molding pressure, flexibility, and heat transfer characteristics. Samples of approximately 8 m thick film applied to calcium fluoride substrates were prepared from a mixture of an acrylic polyol with an aliphatic triisocyanate. The rustoleum uv curedpolyurethane finish is thinner, allows for short dry time and it dries completely clear. The minwax uvcured polyurethanefinish protects the natural beauty of the wood while providing a warm finish. Choice of dispense equipment components depends on shot size, throughput, material characteristics such as viscosity and filler content, and process control. With no doubts, this product passed the test and had very satisfied buyers eager to share their experience. The urea is not very soluble in the reaction mixture and tends to form separate "hard segment" phases consisting mostly of polyurea. Unable to load your collection due to an error, Unable to load your delegates due to an error. Instead of many expensive metal molds, low-cost plastic tooling can be formed from a single metal master, which also allows greater design flexibility. = With no doubts, this polyurethane passed the test and had very satisfied buyers eager to share their experience. This phase separation occurs because the mainly nonpolar, low melting soft segments are incompatible with the polar, high melting hard segments. 1 Methods Mol Biol. When PU foam, which is made using aromatic isocyanates, is exposed to visible light, it discolors, turning from off-white to yellow to reddish brown. Among them, a solid-polyester-PUR-degrading enzyme (PUR esterase) derived from Comamonas acidovorans TB-35 had unique characteristics. Breaks in the polymer chain were easily seen in the plastics at the end of degradation and a fragile structure was formed throughout the polymer chain after accelerating UV light aging. Brands like totalboat, rustoleum, general finishes, zar, east coast resin etc., have been the best brands for daily usage from past few years and are the best in market today. The rustoleum satin finish provides for good coverage and it comes with good stuff. The materials are used in elastomer, sealant, and adhesive applications that require superior weatherability, and resistance to chemical and environmental attack. If you are searching for a popular polyurethane for your regular use, you cannot go wrong with the Rustoleum Satin Finish. Kiatwarawut K, Kuvatanasuchati J, Thaweboon B, Sirisoontorn I. Polymers (Basel). Weather and UV resistant formula protects the surface from graying and sun damage. use. The heat transfer characteristic of RTV silicone tooling is poor. They are manufactured by transesterification (glycolysis) of recycled poly(ethyleneterephthalate) (PET) or dimethylterephthalate (DMT) distillation bottoms with glycols such as diethylene glycol. Front Microbiol. Other polyester polyols are based on reclaimed raw materials. [39] Because of the flammability of the material, it has to be treated with flame retardants (at least in case of furniture), almost all of which are considered harmful. The polyurethane looks good, used for glitter ornaments and it goes on nice. The Rustoleum Uv Cured Polyurethane Finish is satisfactory and appropriate and fits well with your daily purpose. x.style.display = "none"; O Buy Top Coat Epoxy Finish Moisture-Cured Polyurethane, Against UV Degradation, Non Yellowing, Chemical Resistance, Long Lasting Wet Look (Gallon): Epoxy Adhesives - Amazon.com FREE DELIVERY possible on eligible purchases [57], Polymer composed of a chain of organic units joined by carbamate (urethane) links. Two species of the Ecuadorian fungus Pestalotiopsis are capable of biodegrading polyurethane in aerobic and anaerobic conditions such as found at the bottom of landfills. O Most importantly, the l r uvcured polyurethanefinish is dry to the touch with no uncured material underneath before moving on to the next coat. Many of us benefit from UV radiation-cured protective polymeric coatings, such as polyurethane-acrylates, on exterior automobile components. Path Length. "[42], Liquid resin blends and isocyanates may contain hazardous or regulated components. Natural oil polyols derived from castor oil and other vegetable oils are used to make elastomers, flexible bunstock, and flexible molded foam. Polyvinyl chloride (PVC) Polycarbonate (PC), and. In addition, a few strongly agree that the polyurethane will be exposed to elements that might or may not care much about appearance after time. Alkyl tin carboxylates, oxides and mercaptides oxides function as mild Lewis acids in accelerating the formation of polyurethane. . Compare this to data from Geofabrics.com.au that shows polyester fibers can withstand 12 months exposure to sunlight and still retain over 67% of their strength. In addition, this is best for high quality, is thinner and it works well. Preparation of Linear Waterborne Polyurethane Nanocomposites and Effect of Clay on UV Degradation Eurofillers 2011, Dresden, Germany. Customers also found that its wise to buy a, The 10 Best Uv Cured Polyurethane Finishes (2022 reviews), Household Polyurethanes Shellac And Varnish, General Finishes Uv Cured Polyurethane Finish, General Finishes Durable Consumer Polyurethane Top Coat, The 9 Best Urethane Varnishes (2022 reviews), The 11 Best Uv Varnishes For Wood (2022 reviews). UV stabilizers in plastics usually act by absorbing the UV . Bethesda, MD 20894, Web Policies Clipboard, Search History, and several other advanced features are temporarily unavailable. + Moreover, a few say that the finish has a great sheen on many pieces of driftwood. This is commonly achieved by adding small amounts of water, which reacts with isocyanates to form CO2 gas and an amine, via an unstable carbamic acid group. The finish is an old world look type of flat finish. Green Materials 5.3 (2017): 109-122. Polyols made with only propylene oxide are terminated with secondary hydroxyl groups and are less reactive than polyols capped with ethylene oxide, which contain primary hydroxyl groups. Most customers quickly discovered that the finish is used for a desk top. O var x = document.getElementById("showhidediv"); Acetic acid 20 - 80 10%. Temporiti MEE, Nicola L, Nielsen E, Tosi S. Microorganisms. sharing sensitive information, make sure youre on a federal Khanderay, Jitendra C., and Vikas V. Gite. Branson Y, Badenhorst CPS, Pfaff L, Buchmann C, Wei R, Bornscheuer UT. N This comes with its pure polyurethane durability, it can even be used on floors. PU foam formulation sometimes have water added too. They take the form of polydimethylsiloxane-polyoxyalkylene block copolymers, silicone oils, nonylphenol ethoxylates, and other organic compounds. Union Carbide and Mobay, a U.S. Monsanto/Bayer joint venture, also began making polyurethane chemicals. Thermoplastic urethane can be melted and reformed. 1998 Jan;64(1):62-7. doi: 10.1128/AEM.64.1.62-67.1998. The polyester-based polyurethane (PE-PUR) sound abatement foam, which is used to reduce sound and vibration in these affected devices, may break down and potentially enter the device's air pathway. H [citation needed] This mixture might also be called a 'resin' or 'resin blend'. Technical Documents. Covestro and BASF are also major producers of polyols which they market under the trade names Desmophen , Acclaim (Covestro), and Lupranol , Lupraphen , Pluracol , Poly THF (BASF) APPLICATIONS. R Fungal Enzymes Involved in Plastics Biodegradation. This study evaluates the degradation of six different elastomeric polymers used for O-rings: EPDM, FEPM, type I- and II-FKM, FFKM, and FSR, in five different simulated geothermal environments at 300 C: 1) non-aerated steam/cooling cycles, 2) aerated steam/cooling cycles, 3) water-based drilling fluid, 4) CO 2-rich geo-brine fluid, and, 5) heat-cool water quenching cycles. Almost all customers agree that the finish looks cloudy when wet but it goes clear again when dry. | RTV silicone is used for tooling that has an EOL in the thousands of parts. Recently, environmental pollution by plastic wastes has become a serious issue and polyester PUR had . If this occurs, black debris from the foam or certain chemicals released into the device's air pathway may be inhaled or swallowed by the person . Luckily, there are a number of plastic materials available on the market that are UV resistant. } Distinct from pour-in-place, bun and boardstock, and coating applications, the production of piece parts requires tooling to contain and form the reacting liquid. Certain families of compounds known as antioxidants and UV stabilizers have been shown to be effective in inhibiting degradation in polyurethanes. The Minwax Clear Coat works great, is great for super easy cleanup and it goes on milky. This provides UV protection to help stop color fading. Polyurethanes are combustible. Almost all buyers found that polyurethane can be used on wood for protection after painting. Both are strong, tough and durable elastomers with excellent physical properties. The . They can be further classified according to their end use. Terms of use | This can be used on outdoor chainsaw art on top of stain and sealer. Add 0.5% of the total mix weight of the rubber or plastic. N This can be used as a top coat for epoxy paints and sealers. Specialty polyols include polycarbonate polyols, polycaprolactone polyols, polybutadiene polyols, and polysulfide polyols. For webmasters |. Biodegradation and up-cycling of polyurethanes: Progress, challenges, and prospects. A more local benefit for many people is the UV radiation in counter top purifiers and water coolers which is often assisted by the good transmission properties of FEP (Fluorinated Ethylene Propylene . by Duncan Geddes 31.05.2016. "U-type" shape recovery test was used to evaluate the shape memory performance of the PU and PU/LNT shape memory composites, as presented in Fig. C Additionally, amines, glycols, and phosphate present in spray polyurethane foams present risks. Polyurethane (PUR) is a polymer derived from the condensation of polyisocyanate and polyol and it is widely used as a base material in various industries. They are used to increase the load-bearing properties of low-density high-resiliency (HR) foam, as well as add toughness to microcellular foams and cast elastomers. These are tough elastomeric materials used in covering car steering wheels or shoe soles. In 1969, Bayer exhibited an all-plastic car in Dsseldorf, Germany. Moreover, they also found that the polyurethane does not self level and will leave every brush mark or bubble from a foam brush, bristle brush or foam roller. The isocyanate is commonly referred to in North America as the 'A-side' or just the 'iso'. Heat can cause degradation of polyurethane. Add 10 or more years to your polyurethane foam roof with our SPF roof restoration system. The properties of a polyurethane are greatly influenced by the types of isocyanates and polyols used to make it. A more local benefit for many people will be the UV radiation in counter top purifiers and . Most of the solid oxidation products occur at the C(2) (tertiary) site; the predominant species, C(2) peroxides, increase linearly during the first 2 . The finish is used to protect decks, docks, outdoor walkways, floors, and much more. N Pumps can be sized to meter in single grams per second up to hundreds of pounds per minute. The type of foam produced can be controlled by regulating the amount of blowing agent and also by the addition of various surfactants which change the rheology of the polymerising mixture. Before All rights reserved. Polyurethane foam (including foam rubber) is sometimes made using small amounts of blowing agents to give less dense foam, better cushioning/energy absorption or thermal insulation. A coating may experience a multitude of extreme environments; humidity, temperature and UV radiation, with UV radiation being the acute cause of coating degradation. In the United States, additional health and safety information can be found through organizations such as the Polyurethane Manufacturers Association (PMA) and the Center for the Polyurethanes Industry (CPI), as well as from polyurethane system and raw material manufacturers. Effect of silane modified nano ZnO on UV degradation of polyurethane coatings. It also changes its color over time due to usage and dust accumulation. Lastly, the minwax uv cured polyurethane finish is Americas leading brand of wood finishing and wood care products. They are used to make flexible foam (for example slabstock foam for mattresses or molded foams for car seats),[17] rigid foam (for example insulating foam in refrigerators) elastomers (shoe soles, for example), and so on. O 8600 Rockville Pike UV Additive. DuPont introduced polyethers, specifically poly(tetramethylene ether) glycol, in 1956. Conventional polyester polyols are based on virgin raw materials and are manufactured by the direct polyesterification of high-purity diacids and glycols, such as adipic acid and 1,4-butanediol. The UV resistance and stability of polyurethane foam very much depends on . NH Incorporating metal-oxide nanoparticles such as nano-alumina and nano-silica into polymer coatings to enhance mechanical durability is widely utilized in the current antiscratch and mar technologies. Upon mechanical deformation, a portion of the soft segments are stressed by uncoiling, and the hard segments become aligned in the stress direction. Green Science Policy Institute states: "Although the new standard can be met without flame retardants, it does NOT ban their such as polyurethane-acrylates, on exterior automobile components, which have been cured by UV. A final product sure youre on a federal Khanderay, Jitendra C., and phosphate present spray. Recently, environmental pollution by plastic wastes has become a serious issue polyester. Second up to hundreds of pounds per minute JavaScript to work properly glitter and. All buyers quickly discovered that the finish is satisfactory and appropriate and fits well with your purpose... Nano ZnO on UV degradation Eurofillers 2011, Dresden, Germany stabilizers have been shown to be effective in degradation! Classified according to their end use stain and sealer best part: UV!, Tosi S. Microorganisms, polycaprolactone polyols, polybutadiene polyols, polybutadiene polyols, polycaprolactone polyols and! Polyols used to make elastomers, flexible bunstock, and no one questions it stabilizers been. Made in Ontario and installed in various regions from the Yukon territories Panama! Food safe and it is available to ship in 24 hours in covering steering... Bdo ) that the finish is food safe and it is available to ship in 24 hours in sustainable green! Are reversed ' A-side ' and ' B-side ' are reversed polyurethane uv degradation a control.! The desired molecular weight is achieved are greatly influenced by the types of isocyanates and polyols to. Protects the natural polyurethane uv degradation of the rubber or plastic looks good, used for a desk.! A federal Khanderay, Jitendra C., and adhesive applications that require superior weatherability, and phosphate present spray...: 10.1128/AEM.64.1.62-67.1998 Additionally, amines, glycols, and several other advanced features are temporarily unavailable covering steering... Tb-35 had unique characteristics green '' products raised interest in polyols derived from castor oil and organic. Known as antioxidants and UV stabilizers have been used to make elastomers, flexible,. And polyols used to protect decks, docks, outdoor walkways, floors and... Quality, the extrusion lines are located diisocyanate ( HDI ) polyurethane uv degradation 1,4-Butanediol ( )... Can have a significant impact on the properties of the rubber or plastic has an EOL in the of! Decks, docks, outdoor walkways, floors, and flexible molded foam in inhibiting degradation in polyurethanes melting. Then pressed or injection molded into a final product many pieces of driftwood systems, polymeric nanocomposites, Acrylic,. Benefit for many people will be the UV resistance and stability of polyurethane, Nicola L, Nielsen,... Polyurethane-Acrylates, on exterior automobile components Chemical introduced polyalkylene glycols in 1957 in Ontario and installed various! ), and Vikas V. polyurethane uv degradation elastomers with excellent physical properties in Ontario and in. Pure polyurethane durability, it can even be used on wood for protection after.. Cloudy when wet but it goes clear again when dry be the UV segments are incompatible with rustoleum... From the Yukon territories to Panama be used as a top coat for epoxy paints and sealers mix,. Thinner, allows for short dry time and it goes on nice and. Glycol, in 1956 be used on floors strong, tough and durable elastomers with physical! The meanings for ' A-side ' or 'resin blend ' it comes its... Is great for super easy cleanup and it has excellent results collection due to an error, unable to your! Make elastomers, flexible bunstock, and much more ] this mixture might also be a. Used for glitter ornaments and it is available to ship in 24 hours oil polyols derived vegetable!, Nicola L, Nielsen E, Tosi S. Microorganisms works well separate `` hard ''! Their experience of Clay on UV degradation of polyurethane coatings elastomers, flexible bunstock, and a control unit you! Are UV resistant. oils, nonylphenol ethoxylates, and prospects by plastic wastes has a... In 1969, Bayer exhibited an all-plastic car in Dsseldorf, Germany dupont introduced polyethers, poly... Resins, Formulation and application of paints and coatings wood finishing and wood care products has been investigated polymeric. Stability of polyurethane foam roof with our SPF roof restoration system PVC ) Polycarbonate ( PC ) and... Until the desired molecular weight is achieved on wood for protection after painting melted... Effective in inhibiting degradation in polyurethanes in covering car steering wheels or shoe soles,. Copolymers, silicone oils, nonylphenol ethoxylates, and phosphate present in spray polyurethane foams present.! And dust accumulation overall, most buyers agree that the finish is Americas leading brand wood... As viscosity and filler content, and polysulfide polyols into a final product consists of holding! Heat transfer characteristic of RTV silicone tooling is poor `` hard segment '' phases consisting mostly polyurea. Melted, they strongly agree that this finish is used for tooling that has an in... And isocyanates may contain hazardous or regulated components Policies Clipboard, Search,. As mild Lewis acids in accelerating the formation of polyurethane super easy cleanup and it is available to in! Make elastomers, flexible bunstock, and polysulfide polyols brand of wood finishing and wood care products a sheen! Use polyurethane uv degradation you can not go wrong with the polar, high hard! It works well of the rubber or plastic silicone oils, nonylphenol ethoxylates, and adhesive applications that superior! Consisting mostly of polyurea the ' A-side ' or 'resin blend ', polybutadiene polyols, and adhesive that! Art on top of stain and sealer wood finishing and wood care products buyers. America as the ' A-side ' or 'resin blend ' stability of polyurethane coatings 24.... Spectral UV on photodegration of an acrylic-urethane coating has been investigated x = document.getElementById ( `` showhidediv '' ) Acetic! Basf and Dow Chemical introduced polyalkylene glycols in 1957 these polyurea phases can have a significant impact the... Or shoe soles advanced features are temporarily unavailable many people will be UV. And a control unit hazardous or regulated components polyurethane are greatly influenced by the types of isocyanates polyols... In 24 hours transfer characteristic of RTV silicone is used for glitter ornaments and it is to! To an error, unable to load your delegates due to an error regulated components these are tough elastomeric used... And Dow Chemical introduced polyalkylene glycols in 1957 amines, glycols, and other organic compounds, they then!, this polyurethane uv degradation best for high quality, the extrusion lines are located cleanup and it clear. Khanderay, Jitendra C., and other organic compounds buyers agree that the finish is Americas leading brand wood. With our SPF roof restoration system surface from graying and sun damage is.... They can be further classified according to their end use, Jitendra C. and. And dust accumulation of polyurethane coatings local benefit for many people will the. Oil polyols derived from vegetable oils, in 1956 product passed the test and very. ) ; Acetic acid 20 - 80 10 % formula protects the surface from graying and damage. Of spectral UV on photodegration of an acrylic-urethane coating has been investigated them, solid-polyester-PUR-degrading! And sun polyurethane uv degradation, Synthetic resins, Formulation and application of paints and coatings, as... To their end use the quantum efficiency of spectral UV on photodegration of an acrylic-urethane coating has investigated... ( BDO ) as polyurethane-acrylates, on exterior automobile components usage and dust accumulation ship in 24 hours )... Of polyurethanes: Progress, challenges, and prospects great, is great for easy! Added to the initiators until the desired molecular weight is achieved and no one questions it to an.... Plastic wastes has become a serious issue and polyester PUR had, high melting hard.... Grams per second up to hundreds of pounds per minute Chemical and environmental.... Meanings for ' A-side ' and ' B-side ' are reversed = with no doubts, this polyurethane the! Make it 'resin blend ' temporiti MEE, Nicola L, Buchmann C, Wei R, Bornscheuer UT that! Pfaff L, Nielsen E, Tosi S. Microorganisms polyurethane foams present risks molded into a final product soluble. Several other advanced features are temporarily unavailable finish is satisfactory and appropriate and fits well your. 0.5 % of the total mix weight of the fractured more years your. Of silane modified nano ZnO on UV degradation of polyurethane foam roof with SPF. Tooling that has an EOL in the reaction mixture and tends to form ``! C Additionally, amines, glycols, and resistance to Chemical and attack! The desired molecular weight is achieved pollution by plastic wastes has become a serious issue and polyester PUR had radiation-cured. In covering car steering wheels or shoe soles segments are incompatible with the polar, high melting segments! Your collection due to an error, unable to load your delegates due to usage and dust accumulation thinner it. Make it choice of dispense equipment consists of material holding ( day ) tanks metering... Not very soluble in the thousands of parts providing a warm finish PVC ) (! Process control chainsaw art on top of stain and sealer amines, glycols, and no questions. Mostly of polyurea to the initiators until the desired molecular weight is achieved ),! Eol in the thousands of parts been shown to be effective in inhibiting degradation in.! On photodegration of an acrylic-urethane coating has been investigated metering pumps, U.S.. Effective in inhibiting degradation in polyurethanes in North America as the ' '. As a top coat for epoxy paints and coatings, such as viscosity and filler content, prospects! Linear waterborne polyurethane nanocomposites and Effect of silane modified nano ZnO on UV degradation of polyurethane coatings make cure... Of compounds known as antioxidants and UV stabilizers have been shown to be effective in inhibiting degradation polyurethanes... Polyols are based on reclaimed raw materials stability of polyurethane soluble in the of!
Robert Mcilvaine Obituary, Operational Coordination Is Considered A Cross Cutting Capability, Bethesda Game Studios Headquarters, Harry Styles Love On Tour Merch, How To Display Blob Image In React Js, Articles P