Well‐defined side‐chain liquid‐crystalline polysiloxanes | Zendy

Hempenius Mark A. | Zendy; Lammertink Rob G. H. | Zendy; Vancso G. Julius | Zendy

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Well‐defined side‐chain liquid‐crystalline polysiloxanes

Author(s) -

Hempenius Mark A.,

Lammertink Rob G. H.,

Vancso G. Julius

Publication year - 1996

Publication title -

macromolecular rapid communications

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.348

H-Index - 154

eISSN - 1521-3927

pISSN - 1022-1336

DOI - 10.1002/marc.1996.030170503

Subject(s) - disiloxane , mesogen , side chain , polymer chemistry , liquid crystalline , polymerization , chain (unit) , molar mass , molar ratio , materials science , liquid crystal , chemistry , organic chemistry , polymer , composite material , optoelectronics , physics , astronomy , catalysis

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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