Shear Flow Induced Transition from Liquid-Crystalline to Polymer Behavior in Side-Chain Liquid Crystal Polymers

Journal Article · Tue Dec 31 23:00:00 EST 1996 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.78.70· OSTI ID:432551

Noirez, L; Lapp, A ^[1]

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1. Laboratoire Leon Brillouin (CEA-CNRS), Ce-Saclay 91191, Gif-sur-Yvette (France)

We determine the structure and conformation of side-chain liquid-crystalline polymers subjected to shear flow in the vicinity of the smectic phase by neutron scattering on the velocity gradient plane. Below the nematic-smectic transition we observe a typical liquid-crystal behavior; the smectic layers slide, leading to a main-chain elongation parallel to the velocity direction. In contrast,a shear applied above the transition induces a tilted main-chain conformation which is typical for polymer behavior. {copyright} {ital 1996} {ital The American Physical Society}

• OSTI ID: 432551
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 1 Vol. 78; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHAINS
CONFORMATIONAL CHANGES
LIQUID CRYSTALS
PHASE TRANSFORMATIONS
POLYMERS
SHEAR
SOLIDS FLOW