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Synthesis and properties of liquid crystalline polyurethanes

✍ Scribed by Haobo Xin; Yunfeng Zhang; Zheng Xing


Book ID
107373479
Publisher
Higher Education Press and Springer
Year
2006
Tongue
English
Weight
508 KB
Volume
1
Category
Article
ISSN
1673-3495

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Novel type of mesogenic chain extenders used in this study are N,NЈ-bis(4hydroxyphenyl)-3,4,3Ј,4Ј-biphenyldicarboxyimide (BPDI) and N, NЈ-bis[4-(6-hydroxyhexyloxy) phenyl]-3,4,3Ј,4Ј-biphenyldicarboxyimide (BHDI). BHDI has a flexible spacer of 6-methylene units but BPDI does not. The liquid crystalli

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## SYNOPSIS Four series of thermotropic polyurethane elastomers (TPUEs) were synthesized in this study. The hard segments were formed by using 4,4'-methylenedicyclohexyl diisocyanate (H,,MDI) reacted with various mesogenic units, such as benzene-1,4-di(4-iminophenoxyn-hexanol), benzene-1,4-di(4-im

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## Abstract Side‐chain liquid‐crystalline (SCLC) polyurethane elastomers with methoxybiphenyl mesogens pendant on the chain extenders were synthesized by the conventional prepolymer technique and condensation reaction. Two SCLC polyurethanes with mesogens having spacers of six and eight methylene u