Research On The Structure And Properties Of Carbon Materials Modified PPS And Its Blends Composites

Since the new century, technology development of aerospace, electronic information, automobile industry and household electrical appliances changes with each passing day. Therefore, humans for the used materials put forward higher requirements, such as high heat resistance and mechanical property, excellent electric property and durability, resulting more and more attentions to heat resisting polymer matrix composites. As a high performance material, heat resisting polymers in the field of aerospace, military industry and other high-tech, has an irreplaceable position. However, the application of heat resisting polymers have been limited due to some defects in performance, such as Polyphenylene sulfide(PPS) with brittleness and low strength, polyetherether ketone(PEEK) with high viscosity, high temperature nylon(PPA) with high moisture absorption, are mostly compounded with other polymers or particles to overcome these disadvantages. Blending with ordinary polymers, due to the big melting temperature difference, high temperature resistant polymer is difficult to process and mold. But blending with other high temperature resistant polymer, due to the both high processing temperatures, it is difficult to find the appropriate high temperature agent to solve the compatibility problem. How to improve the compatibility of multicomponent high temperature resistant polymer blending system becomes the most pressing common problems and the key to obtain high-performance new materials. Therefore, this thesis offers a new resource way for carbon materials modified high temperature resistant polymer blending system. First of all, the three kinds of carbon nanomaterials( nanodiamond(ND) and graphene nanoplatelets(GNP) and carbon nanotube(CNT)) was respectively join to PPS matrix to prepare PPS nanocomposites. Through structural analysis and performance comparison, come to the conclusion that the CNT modification effect is best. Then respectively introducing PEEK and PPA into PPS matrix to prepare PPS/PEEK and PPS/PPA blend system, and the focus on CNT is used as modifying agent to obtain PPS/PEEK/CNT and PPS/PPA/CNT nanocomposite. In this thesis, the modification technology of carbon materials and its application in PPS and its blends composites were studied.1. The structure morphology, crystallization properties and thermal conductive effect of the carbon materials modified PPS composites were characterized. The results indicated ND, GNP and CNT act as the efficient nucleating agent for PPS and promote its crystallization via heterogenous nucleation. The addition of carbon particles increased the crystallization temperature and rate. Thermal conductivity also increased with increasing GNP and CNT content. In addition, the crystallization and thermal performance of PPS are significantly improved via synergistic effects of CNT and CF in the composites.2. Effects of carbon nanotube on structure morphology, mechanical, crystallization and electrical properties of PPS/PEEK blend were studied. The results shows that recycled PEEK improved the impact and tensile strength of PPS, CNT improved the flexural modulus of PPS/PEEK blends. The CNT was used as a inorganic compatilizer improved the compatibility, promoted the crystallization of PEEK rather than PPS. PPS80/PEEK20 blends express more excellent electrical conductivity than those. Addition of 20 wt % CNT to blend resulted in a composite material with the minimum surface resistivity at a reduction of four orders of magnitude compared with that of the neat blend.3. Effects of carbon nanotube on structure morphology, mechanical, crystallization and electrical properties of PPS/PPA blend were studied. The results show that addition of CNT improved the tensile and flexural strength of PPS/PPA blend. PPA provides nucleation effect on the crystallization of PPS, while CNT increased the crystallization temperature of PPS component in blend. A minimum volume resistivity of 1012 cm at PPS50/PPA50 blend was observed. Addition of 10 wt % CNT to blend resulted in a composite material with the minimum volume resistivity at a reduction of seven orders of magnitude compared with that of the neat blend.