Journal article
Ordering-induced micro-bands in thin films of a main-chain liquid crystalline chloro-poly(aryl ether ketone)
Polymer (Guilford), v 45(11), pp 3967-3972
2004
Abstract
Micro-banded textures developed from thin films of a main-chain thermotropic liquid crystalline chloro-poly(aryl ether ketone) in the melt were investigated using transmission electron microscopy (TEM), selective area electron diffraction, and atomic force microscopy techniques. The micro-banded textures were formed in the copolymer thin films after annealing at temperatures between 320 and 330 °C, where a highly ordered smectic crystalline phase is formed without mechanical shearing. The micro-banded textures displayed a sinusoidal-like periodicity with a spacing of 150 nm and an amplitude of 2 nm. The long axis of the banded texture was parallel to the
b-axis of an orthorhombic unit cell. In the convex regions, the molecular chains exhibited a homeotropic alignment, i.e. the chain direction was parallel to the film normal. In the concave regions, the molecular chains possessed a tilted alignment. In addition to the effects of annealing temperatures and times, the thickness of the film played a vital role in the formation of the banded texture. A possible formation mechanism of this banded texture was also suggested and discussed. It was suggested that the micro-bands were formed during cooling.
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Details
- Title
- Ordering-induced micro-bands in thin films of a main-chain liquid crystalline chloro-poly(aryl ether ketone)
- Creators
- Shanju Zhang - State Key Laboratory of Polymer Physics and ChemistryLuxiang Fu - State Key Laboratory of Polymer Physics and ChemistryJian Zhang - State Key Laboratory of Polymer Physics and ChemistryJingjiang Liu - State Key Laboratory of Polymer Physics and ChemistryDecai Yang - State Key Laboratory of Polymer Physics and ChemistryJason J Ge - University of AkronChristopher Y Li - Drexel UniversityStephen Z.D Cheng - University of Akron
- Publication Details
- Polymer (Guilford), v 45(11), pp 3967-3972
- Publisher
- Elsevier
- Number of pages
- 6
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000221486300046
- Scopus ID
- 2-s2.0-2342492842
- Other Identifier
- 991019168641704721
InCites Highlights
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Polymer Science