Qu'est-ce que le polyuréthane (Unité centrale) Fil
Polyuréthane, communément abrégé PU, est tout polymère constitué d'une chaîne d'unités organiques reliées par des maillons uréthane.
Polyurethane polymers are formed by reacting a monomer containing at least two isocyanate functional groups with another monomer containing at least two alcohol groups in the presence of a catalyst.
Polyurethane formulations cover an extremely wide range of stiffness, hardness, and densities. These materials include:
1.low density flexible foam used in upholstery and bedding,
2.low density rigid foam used for thermal insulation and e.g. automobile […]
