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Molecular orientation of extruded PET/LCP blend films. Part I: Polarized infrared spectroscopy by Marcia C. Branciforti; Lucineide B. Silva; Rosario E. S. Bretas is a Materials Science article available to read on EtoBox.

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## Abstract The polarized infrared (IR) spectroscopy technique was used to evaluate the surface uniaxial molecular orientation of films of poly(ethylene terephthalate) (PET), two thermotropic liquid crystalline polymers (LCPs), Vectra®A950 and Rodrun®LC5000, and their blends obtained by extrusion. The molecular orientation of the LCP and of the crystalline and amorphous PET phases in the draw direction was evaluated along the transverse section of the films and as a function of the blend composition. A compatibilizer agent was used to improve the interfacial adhesion between the PET and LCPs. The results showed that the surface molecular orientation of both LCPs was very high along the draw direction. However, when blended, the orientation of the LCP phase decreased drastically, it was dependent of its content and varied along the transverse section of the extruded films. The maximum orientation was observed in the blend with 5 wt % LCP content and at the position where the shear rate was maxima. The LCP Vectra®A950 showed higher orientation than the Rodrun®LC5000, as a pure material and as blended. For the PET phases, an alignment of the amorphous phase in the draw direction due t

Who reads Molecular orientation of extruded PET/LCP blend films. Part I: Polarized infrared spectroscopy?

Author

Marcia C. Branciforti; Lucineide B. Silva; Rosario E. S. Bretas

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0021-8995)

Published

2006

Language

EN

Field

Materials Science (Physical Sciences)