Inhibited transesterification and enhanced fibrillation of TLCP by nano-SiO2 in polycarbonate matrix |
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| Authors: | Lichuan Wu Peng Chen Jun Zhang |
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| Affiliation: | a Key laboratory of Engineering Plastics, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
b Graduate School, Chinese Academy of Sciences, Bejing 100039, China |
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| Abstract: | Hybrid composites composed of a thermotropic liquid crystalline polymer (TLCP), nano-SiO2 and polycarbonate (PC) were prepared by melt blending in a twin-screw extruder. Infrared spectroscopy analysis indicated that the transesterification between PC and TLCP molecules during melt blending was significantly reduced in TLCP/PC blends filled with nano-SiO2, compared to the unfilled TLCP/PC one. Scanning electron microscopy (SEM) observation showed that better compatibility and finer TLCP dispersion were reached in the unfilled blend, which made the fibrillation of TLCP difficult in capillary flow even at high shear rate. In contrast to this, well-developed TLCP fibrils were formed by capillary flow in nano-SiO2 filled TLCP/PC blends. By increasing the nano-SiO2 concentration and shear rate, the fibrillation of TLCP was significantly enhanced. Thermodynamically the interfacial tension between these components and dynamically the viscosity ratio of TLCP to PC were used to investigate the mechanism of nano-SiO2 in inhibiting the transesterification and enhancing the fibrillation of TLCP droplets in these hybrid composites. |
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| Keywords: | Transesterification Nano-SiO2 TLCP |
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