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| polypropylene | |
|---|---|
| Name | Polypropylene |
| IUPAC name | Poly(1-propene) |
| Other names | Polypropylene |
| Density | ~0.90 g/cm³ |
| Melting point | 130–171 °C |
| Chemical formula | (C3H6)n |
polypropylene Polypropylene is a thermoplastic polymer used widely in Boeing, Toyota, Unilever, Procter & Gamble, 3M products and in applications across New York City, London, Tokyo, Shanghai and Mumbai. It combines low density, chemical resistance, and ease of processing, making it central to industries such as Ford Motor Company, General Motors, Siemens, Samsung Electronics and Apple Inc. manufacturing. The material appears in packaging, textiles, automotive components, and medical devices deployed by institutions like Mayo Clinic, Johns Hopkins Hospital, Cleveland Clinic and companies including Pfizer, Johnson & Johnson and Merck & Co..
Polypropylene serves as a lightweight, semi-crystalline polymer integral to supply chains in Walmart, IKEA, Costco, Target Corporation and Amazon (company). Its combinations of stiffness and toughness enable use in consumer goods sold by Nike, Adidas, L’Oréal, Estée Lauder Companies and PepsiCo. Engineers at MIT, Stanford University, California Institute of Technology, Imperial College London and ETH Zurich study its morphology, while standards bodies like ISO and ASTM International specify test methods.
Early work on polypropylene chemistry occurred in laboratories associated with ICI and researchers influenced by discoveries at BASF, Dow Chemical Company, DuPont, ExxonMobil, and Shell plc. Landmark patents and commercial scale-up involved collaborations with manufacturers supplying General Electric, Hitachi, Mitsubishi Heavy Industries and Sumitomo Chemical. Industrial adoption accelerated during post‑World War II expansion in Detroit, Pittsburgh, Ruhr (region), Yokohama and Rotterdam as companies like Honda, Nissan, Volkswagen and Renault integrated the polymer into mass-produced vehicles and consumer appliances.
Polypropylene is a polyolefin derived from the monomer 1‑propene; its repeat unit has the formula C3H6 and yields isotactic, syndiotactic, and atactic stereoregular forms characterized by tacticity first rationalized in studies at Cambridge University, Harvard University, Yale University and Princeton University. Crystallinity and melting behavior relate to chain microstructure, influencing thermal and mechanical properties measured to standards from IEEE, SAE International, DIN, and British Standards Institution. Its low density (~0.90 g/cm³) contrasts with polyethylenes used by companies like Chevron Phillips Chemical and polymers in specialty products from DuPont Performance Elastomers.
Commercial polymerization uses Ziegler–Natta and metallocene catalysts developed from research tied to Nobel Prize–winning chemistry and firms such as W.R. Grace and Company, Bayer, Lummus Technology and INEOS. Processes operate in reactors at sites in Houston, Corpus Christi, Antwerp, Ulsan, Port of Barcelona and Jubail and rely on feedstock ethylene/propylene supplies from refineries owned by Saudi Aramco, Gazprom, Rosneft, PetroChina and BP. Techniques include bulk, slurry, and gas‑phase polymerization optimized by licensors like TechnipFMC and KBR, Inc..
Commercial grades vary among homopolymers, random copolymers, and impact copolymers tailored for firms such as Johnson Controls, Boeing, Airbus, General Dynamics and Lockheed Martin. Additive packages from suppliers like Clariant, Eastman Chemical Company and Evonik Industries impart UV stability, flame retardance, and color matching for brands like Sony, Panasonic, LG Electronics, Heineken and Coca-Cola. Specialty medical grades meet regulatory expectations from FDA, EMA, Health Canada and TGA (Australia).
Polypropylene appears in packaging produced for Nestlé, Mars, Incorporated, Kellogg Company, Mondelez International and Conagra Brands; in textiles marketed by H&M, Zara, Gap Inc., Fast Retailing and VF Corporation; and in automotive parts specified by Daimler AG, BMW, Hyundai Motor Company, Kia and BYD Company. In construction it is used in piping and insulation projects by contractors working with Bechtel, Fluor Corporation, Skanska, Vinci SA and ACS Group. Medical uses include syringes and implantable devices deployed by Roche, Abbott Laboratories, Medtronic and Stryker Corporation.
Life‑cycle assessments produced by research centers at University of Cambridge, University of Oxford, ETH Zurich, National Renewable Energy Laboratory and Fraunhofer Society compare polypropylene to alternatives in studies funded by European Commission, United Nations Environment Programme, World Bank, OECD and EPA (United States Environmental Protection Agency). Recycling programs run by municipalities like Los Angeles, New York City Department of Sanitation, London Boroughs, Paris and Tokyo Metropolitan Government and corporate initiatives from Loop Industries, TerraCycle, PlasticsEurope and Ellen MacArthur Foundation promote mechanical and chemical recycling. Concerns about microplastics cited in reports by WHO, Greenpeace, WWF, Sierra Club and Friends of the Earth have led to regulatory scrutiny by European Parliament, U.S. Congress, Parliament of the United Kingdom, Indian Parliament and Australian Parliament and to innovations in biodegradable additives from startups incubated by Y Combinator and accelerators like Plug and Play Tech Center.
Category:Plastics