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PU -By Wikipedia

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PU -By Wikipedia
Issue Time:2012-09-01
 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:

ROH + R'NCO → ROC(O)N(H)R' (R and R' are alkyl or aryl groups)