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PolyJet (3D printing)
PolyJet is a material jetting 3D printing process, owned by Stratasys, that jets liquid photopolymer droplets cured with UV light to build smooth, accurate, multi-material parts.
Polylactic acid recycling
Polylactic acid recycling (PLA recycling) recovers the biobased polyester PLA from waste by mechanical, chemical, and biological means, such as depolymerizing it back to lactic acid.
Polymarket
Polymarket is a prediction market platform founded in 2020 by Shayne Coplan on which users buy and sell shares in outcomes of events such as elections and sports.
Polymer aerogel insulation
Polymer aerogel insulation is thermal insulation made from aerogels whose solid skeleton is an organic polymer rather than silica, combining very low thermal conductivity with the toughness and flexibility of plastics.
Polymer blend
A polymer blend is a physical mixture of two or more polymers that combines their properties in one material; most blends are immiscible and need compatibilizers.
Polymer brushes
A polymer brush is a layer of polymer chains tethered by one end to a surface at a density so high that the chains stretch away from it.
Polymer clay
Polymer clay is an oven-hardening modeling material made of PVC particles in a liquid plasticizer; it never dries in air and is used for jewelry, beads, miniatures, and sculpture.
Polymer crystallinity
Polymer crystallinity is the fraction of a polymer existing in ordered crystals rather than the disordered amorphous phase. Semicrystalline polymers form thin lamellar platelets, often arranged as spherulites.
Polymer degradation
Polymer degradation is the change in a polymer's chemical structure, molecular weight, or properties caused by heat, oxygen, UV radiation, moisture, mechanical stress, chemicals, or microorganisms.
Polymer flooding
Polymer flooding is an enhanced oil recovery method that thickens injection water with polymers like HPAM, improving sweep efficiency; China's Daqing oilfield is its largest application.
Polymer Genome
Polymer Genome is a free web-based platform that predicts polymer properties from chemical structure in seconds, developed by Rampi Ramprasad and co-workers at Georgia Tech.
Polymer informatics
Polymer informatics is the application of data science and machine learning to polymer composition, processing, and characterization data to predict properties and choose experiments rationally.
Polymer nanocomposite
A polymer nanocomposite is a composite material in which nanoparticles 1 to 100 nm in size are dispersed in a polymer matrix to improve its properties.
Polymer solar cell
A polymer solar cell is a lightweight, flexible photovoltaic device that converts light into electricity using a thin film of conjugated polymer donor paired with an acceptor material.
Polymer solid-state electrolytes
Polymer solid-state electrolytes are salt-doped polymer membranes that conduct lithium ions between battery electrodes while remaining solid, safer than liquids but so poorly conducting at room temperature that cells usually run warm.
Polymer thermoelectrics
Polymer thermoelectrics are polymer-based materials that convert heat directly into electricity or cooling through the Seebeck and Peltier effects, with PEDOT the most developed example.
Polymer-bonded explosive
A polymer-bonded explosive (PBX), also called a plastic-bonded explosive, binds explosive crystals such as RDX or HMX in a synthetic polymer matrix that reduces shock sensitivity; the first PBX was made at Los Alamos in 1952.
Polymer-ceramic composite electrolyte
A polymer-ceramic composite electrolyte is a solid ion-conducting battery material combining a polymer-salt matrix with a ceramic phase, studied as a safer, nonflammable route toward solid-state lithium and sodium batteries.
Polymer-derived ceramics
Polymer-derived ceramics (PDCs) are ceramic materials produced by heating preceramic polymers above about 800 °C, allowing shaping by molding or 3D printing before the ceramic exists.
Polymer-modified asphalt
Polymer-modified asphalt, also called polymer-modified bitumen, is an asphalt binder produced by dispersing 3 to 7 percent polymer into molten asphalt to resist rutting, fatigue cracking, and thermal cracking.
Polymorphic code
Polymorphic code is software that mutates into a different version of itself with each run while keeping the same function, a technique used by malware to evade antivirus detection.
Polymorphism (computer science)
Polymorphism, also known as type polymorphism, is a computer science concept letting code work with values of many types, including subtype, parametric, and ad hoc polymorphism.
Polynomial cam profile
A polynomial cam profile defines a cam follower's displacement by a polynomial of the cam angle, with standard 3-4-5 and 4-5-6-7 forms ensuring smooth, continuous motion.
Polynomial interpolation
Polynomial interpolation, also called interpolating polynomial, is the problem of finding the unique polynomial of degree at most n that passes exactly through n+1 given data points.
Polynomial kernel
The polynomial kernel is a kernel function in machine learning that computes a scaled, shifted inner product raised to a degree, letting support vector machines learn nonlinear boundaries.
Polynomial spiral path
A polynomial spiral path is a plane curve whose curvature is a polynomial function of arc length, used in robotics and autonomous driving to generate smooth vehicle paths.
Polyolefin upcycling
Polyolefin upcycling is the catalytic conversion of polyolefin plastics like polyethylene and polypropylene into higher-value products, cleaving only a small fraction of the polymer's bonds.
Polyolefin upcycling by hydrogenolysis
Polyolefin upcycling by hydrogenolysis is a catalytic chemical recycling method using metal catalysts and hydrogen to convert waste polyethylene and polypropylene into fuels, lubricants, and waxes below 300 °C.
Polyphenylene sulfide
Polyphenylene sulfide (PPS) is a semicrystalline engineering thermoplastic combining heat, flame, and chemical resistance with electrical insulation, first commercialized by Phillips Petroleum in 1973 as Ryton.
Polyphon (company)
Polyphon was a Leipzig company founded in 1887 as Brachhausen & Rießner, best known for its disc-playing music boxes and largest in Europe around 1900.