Journal
COLLOID AND POLYMER SCIENCE
Volume 288, Issue 8, Pages 859-867Publisher
SPRINGER
DOI: 10.1007/s00396-010-2208-8
Keywords
Liquid crystalline polymers (LCP); Parallel and perpendicular orientation; Smectic mesophases; Synchrotron diffraction; Uniaxial deformation
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Funding
- MICIIN [MAT2007-65519-C02-01, MAT2007-65519-C02-02]
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The phase transitions and the orientational behavior of liquid crystalline poly(triethylene glycol p,p'-bibenzoate) have been studied. The real-time synchrotron diffraction results indicate that, on cooling from the isotropic melt, an orthogonal SmA mesophase is formed first, and later it is transformed into a tilted SmC mesophase. However, the SmA mesophase is stable in a rather wide temperature interval, and the transformation into the SmC phase occurs at temperatures close to the glass transition, so that not very high tilting angles are attained. The uniaxial deformation of the SmC mesophase indicates that usual parallel orientation of the molecular axes in relation to the stretching direction is obtained at high strain rates, while anomalous perpendicular orientation occurs at low deformation rates, with the smectic layers aligned with the stretching direction and the molecular axes almost perpendicular. A mixture of the two types of orientation is observed at intermediate rates, with rather interesting features.
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