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The effect of composition on thermal, mechanical, and morphological properties of thermotropic liquid crystalline polyester with alkyl side‐group and polycarbonate blends
Author(s) -
Chang JinHae,
Choi BongKu,
Kim JaeHoon,
Lee SooMin,
Bang MyungSik
Publication year - 1997
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.11804
Subject(s) - thermotropic crystal , materials science , polycarbonate , scanning electron microscope , ultimate tensile strength , alkyl , composite material , polyester , rheometry , thermal stability , rheology , polymer , rheometer , chemical engineering , liquid crystalline , organic chemistry , chemistry , engineering
A thermotropic liquid crystalline polymer (LCP) with an alkyl side‐group was synthesized. Blends of the LCP with polycarbonate (PC) were prepared by coprecipitatton from a common solvent. The rheological behavior of the LCP/PC blends was found to be very different from that of PC, and significant viscosity reductions were observed in the temperature range of 200–230°C. Blends of different LCP compositions were extruded with different draw ratio from a capillary rheometer. The ultimate tensile strength showed a maximum at a 10 wt% LCP composition in the blends. It decreased for compositions greater the 10 wt% LCP, whereas the initial modulus increased with increasing LCP content. The morphology of the blends was found to be affected by their compositions. Scanning electron microscopy (SEM) studies revealed finely dispersed spherical LCP domains in the PC matrix. The SEM micrographs also showed a poor adhesion between the two phases.