【作者】 吉祥波；

【导师】 王贵宾； 姜振华；

【作者基本信息】 吉林大学 ， 高分子化学与物理， 2005， 硕士

【摘要】 本文通过控制磺化反应条件对线形聚醚醚酮（PEEK）进行了磺化,通过控制反应时间和反应温度,制备了不同磺化度的磺化聚醚醚酮（SPEEK）。磺化度为84%SPEEK 的作为对CaCO3的表面处理剂,低磺化度SPEEK 作为CaCO3和PEEK 基体之间的增容剂,制备了不同添加量的CaCO3/PEEK 复合材料。并研究了各种因素对复合材料力学性能的影响。低磺化度SPEEK 改善了碳酸钙颗粒在聚醚醚酮基体中的分散状态,高磺化度的SPEEK 可以直接和碳酸钙颗粒表面发生偶联,得到力学性能和热学性能优异的复合材料。另一方面,低磺化度的SPEEK 和PEEK 的相容性随着磺化度的提高而降低,在对基体树脂的增强方面,有一定的削弱作用。通过调控碳酸钙含量以及颗粒尺寸,同时使用表面改性剂SPEEK 处理CaCO₃ 后增强了填料颗粒和基体之间的相互作用,促进颗粒在基体中的分散,使材料具有良好的加工性能。耐高温表面处理剂磺化聚醚醚酮应用于CaCO₃/PEEK 复合材料中,实现了对体系的改性目的,同时为制备新型颗粒填充聚醚醚酮复合材料开辟了新的领域。更多还原

【Abstract】 The challenge of improving the mechanical of semi-crystalline polymers continues to receive considerable interest. Among the effective methods particulate polymer composites represent growth sector in industry due to their competitiveness in terms of cost and performance. The properties of particulate composite are influenced by many factors such as filler characteristics, filler content, interfacial adhesion, and etc. One common purpose for adding mineral fillers to polymers is cost reduction. Fillers have also been used increasingly to fulfill additional roles, such as enhancing stiffness, decreasing dielectric loss or increasing absorption of infrared radiation. The mechanical and thermal properties of composites are strongly dependent on the reinforcement and interfacial compatibility of the composite system. The characteristics of particulate filled polymers are determined by the properties of their components, composition, structure and interactions. A possible way for the improvement of composite properties is the modification of interfacial interactions either through changing the size of the interface or through altering the strength of the interaction, and the surface treatment is the obvious way to modify interaction. Particulate filled polymers are prepared by melt mixing of the components, thus the major attractive and separating forces must be considered under these conditions. And also the surface properties of the fillers are concerned in thermal compounding. Therefore, the application of some coupling agents in particulate filled polymer have generally been directed to overcome the dispersion problem and to enhance the mechanical strength of composites by improving adhesion across the interface and thus upgrade the performance of composites. Calcium carbonate is a common filler that can be obtained in a variety of sizes and surface treatment. Many types of specially precipitated calcium carbonate filler particles have relatively regular, nearly equiaxed shapes. PEEK is a semi-crystalline, high performance thermoplastic with Tg of 143oC and Tm of 334oC. Its superior mechanical properties and excellent resistance to hydrolysis and thermal stability have resulted in its extensive usage as structural and load bearing materials in the aerospace and marine industries. In this study, calcium carbonate particles were incorporated into poly ether ether ketone(PEEK) for potential use in major load bearing applications and biomaterial field. The temperature of the compounding of PEEK with inorganic fillers was above 350oC, under which most of the common coupling agents are not suitable to this compounding system. Therefore, an attempt was made to find a new type of coupling agent based on PEEK applied in this compositesystem, and it was found that sulfonated PEEK (SPEEK) can offer active groups of –SO3H in the backbone of PEEK. Treatment with SPEEK can effectively modify the dispersion of the calcium carbonate particles in the PEEK matrix, and a surface layer between the fillers and the matrix can also influence the behavior of the polymer chains. CaCO3/PEEK (Poly ether ether ketone) composites were prepared on a twin-screw extruder with different mass ratio of CaCO3/PEEK from 0-30%. The influence of surface treatment with sulfonated PEEK(SPEEK) of the particles on the mechanical and thermal properties of the composites was studied. And the melting rheology behavior of CaCO3/PEEK composites was also investigated. The experiments included tensile tests, flexural tests, notched Izod impact tests, TGA, DSC, SEM and dynamic melting rheology tests. The modulus and yield stress of the composites increased with CaCO3 particles loadings. This increasement was attributed to the bonding between the particles and the PEEK matrix, as can be proved by the SEM picture of tensile fracture surface of the composites. The impact strength of the composites was modified by the SPEEK coated on the CaCO3 particle surface. The dynamic melting rheology of CaCO3 /PEEK with different particle size was studied, the results showed that the viscosity of CC0.1/PEEK composites decreased with the loadings of CC0.1, and was lower than those of CC2.0/PEEK and CC3.0/PEEK composites.更多还原