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Well-defined side-chain liquid-crystalline polysiloxanes

✍ Scribed by Mark A. Hempenius; Rob G. H. Lammertink; G. Julius Vancso

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
251 KB
Volume
17
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

A route to well‐defined side‐chain liquid‐crystalline polysiloxanes (ratio of weight‐to number‐average molar masses M̄~w~/M̄~n~ < 1.2 is reported. Anionic ring‐opening polymerization of pentamethylvinylcyclotrisiloxane yielded a poly(dimethylsiloxane‐co‐methylvinylsiloxane) backbone. A flexible disiloxane spacer was used to connect 4‐(ω‐alkenyloxy)‐4′‐cyanobiphenyl mesogenic molecules to the vinyl groups which belong to the backbone, leading to a side‐chain liquid‐crystalline polysiloxane (SCLCP) which has its mesogens distributed regularly along the main chain. Preliminary measurements indicate an electro‐optic switching time τ~s~ = 1 min at 20°C and 7 s at 32°C (dc, 5 V/μm)).

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