Abstract in English

References used

Lyman, D. J. (1972). “Step Growth Polymerization“. d.h solmon editor vol 3.95
Sanunders, J. H. (1975). High Polymer k. c. Frisch, s. c. reegen Editors Vol 16, part 1. “polyurethanes chemistry and technology
Camberlin, Y., Pascault, J. P. (1994). J. Die. Makromol.chem 350, 32

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