Processing and characterization of liquid crystalline copoly-(ethylene terephthalate-co-2(3)-chloro-1,4-phenylene terephthalate)/polycarbonate blends |
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| Authors: | Do Mook Rhee Wan Shik Ha Ji Ho Youk Dong Il Yoo |
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| Institution: | (1) Department of Textile Engineering, Chonnam National University, 300 Yongbong-dong, Puk-ku, 500-757 Kwangju, Korea;(2) Samyang Group Central R & D Center, 63-2 Hwaam-dong, Yusung-ku, 305-348 Taejeon, Korea;(3) Department of Fiber and Polymer Science, Seoul National University, Shinlim-dong, Kwanak-ku, 151-742 Seoul, Korea;(4) Department of Chemistry, University of Alabama at Birmingham, 35294-1240 Birmingham, AL, USA |
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| Abstract: | Liquid crystalline (LC) poly(ethylene terephthalate-co-2(3)-chloro-1,4-phenylene terephthalate) (50/50, mole/mole) PECPT] was synthesized and blended with polycarbonate (PC).
LC properties of PECPT and thermal, morphological, and rheological behaviors of the PECPT/PC blend were studied. PECPT showed
the nematic LC phase and much longer relaxation time than poly(ethylene terephthalate) (PET). The apparent melt viscosity
of PECPT was one third of that of PET. An abrupt torque change was observed during the blending process due to the orientation
of LC domains. For the blends containing 10∼30 wt% of PECPT, the complex viscosities were higher than that of PC. As PECPT
content increases above 40 wt%, shear thinning was observed. The lowest complex viscosity was obtained at 40∼50 wt%. Transesterification
of PECPT and PC was confirmed by the selective chemical degradation of carbonate groups in PC. |
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| Keywords: | PECPT PC Rheological property Blend Morphology Transesterification |
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