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Relationship between processing, microstructure, and mechanical properties of injection molded thermotropic LCP

✍ Scribed by Y. L. Wang; C. Y. Yue; K. C. Tam; X. Hu

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
93 KB
Volume
88
Category
Article
ISSN
0021-8995

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✦ Synopsis

Abstract

A commercial thermotropic liquid crystalline polymer (LCP), Vectra A950, was injection molded into rectangular sheets of thickness ranging from 1 to 4 mm. By changing the thickness of the mold, the shear rate experienced by the TLCP melt in the mold could be varied. The 1‐mm test sample was highly anisotropic while that with larger thickness (4 mm) was less anisotropic. X‐ray diffraction profile at various depths for each of the test sample corresponded to the degree in the fiber orientation present in the test samples. The anisotropy can be described macroscopically by measuring the tensile strength and modulus in the longitudinal and transverse direction. The ratio between the longitudinal and transverse property decreases proportionally to the thickness of the test sample. This reduction corresponded to the reduction in the shear field as the thickness of the mold was increased. Β© 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 1713–1718, 2003

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