Knowra Polyurethane Polyurethane Polyurethane is a family of polymers whose chains contain urethane linkages. Its chemistry can produce flexible or rigid foams, elastomers, adhesives, and protective coatings.
Polyaddition : A polymer-forming reaction in which molecules add together without releasing small-molecule byproducts. Many polyurethanes form by adding isocyanates to compounds bearing hydroxyl groups.
Polymer : A substance composed of molecules built from repeating or recurring structural units. Polyurethane belongs to this broad family of large-chain molecules.
Flexible polyurethane foam : A resilient, open-cell polyurethane foam used chiefly for cushioning and comfort. It is widely used in furniture, mattresses, and vehicle seating.
Polyethylene : A widely used thermoplastic polymer whose chains consist mainly of repeating ethylene units. Unlike polyurethane, polyethylene contains no urethane linkages and has a simpler hydrocarbon backbone.
Isocyanate exposure : Human contact with isocyanate chemicals, which can irritate or sensitize the respiratory system and skin. Workers handling polyurethane precursors may face exposure risks before the material cures.
Isocyanate : A reactive chemical group, –N=C=O, used to make polyurethanes and other compounds. Isocyanate groups react with polyols to create the polymer’s urethane linkages.
Polymerization : A chemical process that joins small molecules into larger molecules or networks. It provides the general framework for understanding how polyurethane chains form.
Rigid polyurethane foam : A stiff, often closed-cell polyurethane foam used for thermal insulation and structural support. Its low thermal conductivity makes it useful in building and appliance insulation.
Polyvinyl chloride : A chlorine-containing thermoplastic polymer used in construction, products, and medical devices. PVC is a major alternative for flexible tubing and coatings, but its polymer chemistry differs.
Chemical recycling : Recycling that breaks materials into chemical feedstocks or smaller molecules for reuse. It is one route explored for recovering value from polyurethane waste.
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