出典:Wikipedia
出典:『Wikipedia』 (2011/07/07 18:55 UTC 版)
A polyurethane (PUR and PU) is any polymer composed of a chain of organic units joined by carbamate (urethane) links. Polyurethane polymers are formed through step-growth polymerization, by reacting a monomer (with at least two isocyanate functional groups) with another monomer (with at least two hydroxyl or alcohol groups) in the presence of a catalyst.
polyurethane foam made from polyurethane
a synthetic fiber made of polymides, called nylon
5葉の.
5‐foliate