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Processing and Properties of TLCP/CNT Nanocomposite

Author: HuangCaiXia
Tutor: SuZhiFeng
School: South China University of Technology
Course: Materials Science
Keywords: Carbon nanotubes Thermotropic liquid crystalline polymer Composites Mechanical Properties Thermal stability Rheological properties
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 31
Quote: 0
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Abstract


Although the mechanical properties and heat resistance than ordinary plastic liquid crystal polymer (liquid crystal polymer, LCP), but still can not meet certain special applications, in order to further enhance its performance, the subject will be thermotropic liquid crystal polymers (thermotropic liquid crystal polymer, TLCP) Vectra A950 (VA) with high strength and high modulus high toughness of carbon nanotubes (CNT) composite, has a very important meaning to expand the the TLCP application range. Get this paper in orthogonal experiments under the experimental conditions, using a micro twin screw extruder melt blending and micro injection molding machine injection molding prepared TLCP in / CNT the TLCP in the / CNTCOOH (CNTCOOH by CNT mixed acid treatment) and TLCP / PET / CNT three systems nanocomposites. Study different dosage the CNT, CNTCOOH and PET / CNT nanocomposite morphology and performance. By characterization found that the structure of the composite material, CNT can form a good dispersion in the matrix TLCP CNTCOOH TLCP matrix serious agglomeration. Add PET, PET can play a similar role of binder inhibit the formation of skin-core structure, and the CNT can be formed in TLCP / PET good dispersion. Little effect the CNT, CNTCOOH and PET crystalline properties of TLCP. Since the CNT dispersed uniformly in the matrix, so TLCP in / CNT composite materials, mechanical properties, thermal stability, and rheological properties with increasing CNT content increased, and various performance indicators when TLCP / CNT mass ratio of 100/2 reaches the optimum value. When this mass ratio, relatively pure TLCP TLCP in / CNT composites tensile strength, modulus and elongation at break increased by 16%, 39% and 53%; initial decomposition temperature, thermal decomposition temperature and 10% the maximum decomposition rate of temperature increase of about 5 ° C; non-Newtonian index n raise 0.079 fluid consistency index lgK reduce to 0.297, but of TLCP the melting and crystallization temperature are not affect by CNT. Mixed acid treatment of CNT Although the CNTCOOH get still has a tubular structure of the CNT, but too much because the surface carboxyl content TLCP matrix serious agglomeration, resulting in unsatisfactory mechanical properties, but the thermal stability of the composite but improved as the content increases CNTCOOH when the TLCP / CNTCOOH mass ratio of 100/2, the initial decomposition temperature, thermal decomposition of 10% when the temperature and the maximum decomposition rate than pure TLCP temperature increase of 10 ° C, respectively, 11 ° C and 8 ° C. The system composites still maintain good processing performance and the TLCP the grain size, the melting point and crystallization temperature is also not affect by CNT. TLCP / CNT composite properties can be further improved by adding 7 parts of PET using a direct blend method. When TLCP / PET / CNT mass ratio of 100/7/1 when the mechanical properties of the composite material, the composite material modulus, strength, breaking elongation, respectively 27.3GPa 189MPa, 3.6%. However, because PET thermal stability is poor, the small molecule having a CNT on the PET degradation adsorption such that the thermal stability of the composite material is reduced with the increased content of CNT; but also due to a short chain molecules generated in the degradation of the PET part plasticized role than TLCP / CNT composite material has improved rheological properties and the toughness of the composite material. Through a comprehensive analysis of the three composite materials, it is found with 7 parts PET modified TLCP / CNT composites i.e. TLCP in / PET / CNT composite material has the best overall performance, and lower cost.

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