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PU -By Wikipedia
publisherTony
time2012/09/01
A polyurethane (PUR and PU) is polymer composed of a chain of organic units joined by carbamate (urethane) links.
Polyurethane polymers are formed by combining two bi- or higher functional monomers. One contains two or moreisocyanate functional groups (with formula –N=C=O) and the other contains two or more hydroxyl groups (with formula –OH). The alcohol and the isocyanate groups combine to form a urethane linkage: