ポリウレタンウレアの合成反応および副反応の解析 [in Japanese] THE ANALYSTS OF SYNTHETIC AND SIDE REACTIONS OF POLYURETHANEUREA [in Japanese]
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Reaction conditions giving linear prepolymers and polyurethaneureas which have less branching were investigated. The content of the main bonds such as allophanates and biurets formed by side reactions in the preparation of prepolymer were measured.<br>The stability of isocyanates in dimethylacetamide is lower than that in bulk, therefore the bulk method is preferable for preparation of prepolymers.<br>Reaction of n-butylphenylurea with phenylisocyanate was studied as a model reaction of biuret bond formation, and the rate constant was high enough to make branch in polymerization.<br>From the results of solvent extraction tests, it was supposed that polyurethaneureas have large composition distribution.
GOMU 72(3), 139-143, 1999-03-15
THE SOCIRETY OF RUBBER SCIENCE AND TECHNOLOGYY, JAPAN