Urethane is the trivial name of carbamic acid NH2.CO.OH
Though apparently polyurethaneformation is an addition reaction, the mode of formation, however, involvesstep growth mechanism only. That is, the polymeric chains are not formed allat once as in the case of true addition polymers; but only gradually asdimmers, trimers, tetramers, pentamers etc.
Author is Faculty inFootwear Design Development Institute, Fursatganj, Raebareli.
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