Dibenzyl Structures in Macromolecular Chains
作者:
A.A. Caraculacu,
G. Caraculacu,
期刊:
Journal of Macromolecular Science: Part A - Chemistry
(Taylor Available online 1985)
卷期:
Volume 22,
issue 5-7
页码: 631-652
ISSN:0022-233X
年代: 1985
DOI:10.1080/00222338508056627
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The dibenzyl system represents the simplest biaromatic system able for rotational isomerism which allows multiple spatial arrangements, with different reciprocal influences of the functional groups situated in the two rings. The possibility of introducing this system to a macromolecular chain and its influence on some properties of the polymer obtained was studied of the cases of polyurethanes, polyureas, poly(parabanic acids), and poly-imides. In the case of copolyurethanes, made using 4,4′-dibenzyl-diiSocyanate, an unexpected phenomenon was the possibility of disproportionation of some homogeneous systems by two parallel polyaddition processes which progress in parallel in two places, i.e., solution and suspension, leading to different polymers. The process is probably governed by the lower entropy of the crystalline polymer which appears in suspension. Some practical applications of polymers with dibenzyl structures are presented.
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