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A gradient structure formed in injection‐molded polycarbonate in situ hybrid composites and its corresponding performances
Author(s) -
Zhang Baoqing,
Zhang Jun,
He Jiasong
Publication year - 2004
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.20847
Subject(s) - polycarbonate , materials science , composite material , optical microscope , core (optical fiber) , scanning electron microscope , glass transition , ultimate tensile strength , polymer , molding (decorative) , in situ , phase (matter) , polarized light microscopy , glass fiber , tensile testing , optics , chemistry , physics , organic chemistry , meteorology
Three polycarbonate (PC) composites that were reinforced, respectively, with liquid crystalline polymer (LCP), glass fibers, and both of them were prepared by a single injection‐molding process. The role of LCP in improving the processibility of the composites was characterized by torque measurement test. The transitions of LCP morphology in two‐ and three‐component composites were investigated by using polarizing optical microscopy and scanning electron microscopy. The micrographs showed a skin–core gradient structure in all three systems investigated, and the addition of glass fiber to the PC/LCP blend affected the morphological transition and content distribution of dispersed LCP phase through the thickness of the injection‐molded samples. These results were correlated well with the measurements of tensile mechanical properties and dynamic mechanical analysis. How to fully use the dispersed LCP phase in PC in situ hybrid composites was discussed for the thickness change of core layer and the heterogeneous distribution of more LCP in the core. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: 625–634, 2004