Shear Induced Smectic-A–Smectic-CTransition in Side-Chain Liquid-Crystalline Polymers | Zendy

Laurence Noirez | Zendy

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Shear Induced Smectic-A–Smectic-CTransition in Side-Chain Liquid-Crystalline Polymers

Author(s) -

Laurence Noirez

Publication year - 2000

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.84.2164

Subject(s) - mesogen , liquid crystal , polymer , materials science , shear (geology) , orientation (vector space) , crystallography , thermodynamics , physics , condensed matter physics , liquid crystalline , chemistry , mathematics , geometry , composite material

We show that the smectic layer orientation in side-chain liquid-crystalline polymers depends on the molecular weight and the shear rate. Parallel orientation is obtained with the low molecular weight polymer and reveals a shear induced decrease of the smectic layer thickness. In contrast with usual liquid crystals, the shear torque acts at the mesogen scale through an efficient coupling between the polymer main chain and the mesogens resulting in a smectic- A-smectic- C transition.

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