【作者】 王兆滨；

【导师】 王满力； 周元康；

【作者基本信息】 贵州大学 ， 化学工艺， 2006， 硕士

【摘要】 酚醛树脂是一种最早发现并获得广泛应用的合成树脂，作为原料可用于模塑料、胶黏剂、涂料等。但是随着现代工业的飞速发展，一些领域对树脂的耐热性及其它性能提出了更高的要求，因此，对酚醛树脂进行各种化学改性，是研究高性能酚醛树脂复合材料的发展方向。 本文在制备纯酚醛树脂和硼改性酚醛树脂的基础上采用原位聚合法合成了硼酚醛／SiO₂纳米复合材料。采用IR、TEM、SEM和热分析（TG和DSC）技术，研究了所制备的改性酚醛树脂的结构和热稳定性能，研究相关反应机理和复合材料性能的变化规律，并研究了以该改性酚醛树脂为基体树脂制成的摩擦材料的摩擦磨损性能。结果表明：经表面化学处理的纳米粒子能均匀地分散到改性酚醛树脂基体中，纳米粒子的分散粒径为30～300nm，纳米粒子的加入和均匀分布还可缩短凝胶化时间。所制备的硼酚醛／SiO₂纳米复合材料具有优异的对热稳定性，能获得较高的残碳率，可达到高性能摩擦材料对酚醛树脂基体性能的要求。与普通酚醛树脂相比，由该纳米复合材料制成的摩擦材料摩擦性能显著改善，摩擦系数稳定、高温下磨损率小，有效地避免了摩擦磨损性能的热衰退，扩大了高温制动条件范围，可作为高性能摩擦材料使用。 本文通过热分析和摩擦性能分析等研究了反应条件及投料比对复合材料结构和性能的影响。并确定了一条较佳的工艺路线。更多还原

【Abstract】 Phenolic resin is a kind of synthetic resin which found early and applied widely, and it can be used as material for molding compound, adhesive, paint, and so on.With the development of industry, the request for it’s heat-stability and other quality is increasing. The tendency of phenolic resin composite is to improve it’s character by chemical modification.In this paper, boron phenolic resin/nano-SiO₂ composite was synthesized in-situ technique based on the preparation of phenolic resin and boron modified phenolic resin. The structure, curing behavior and heat-stability of modified phenolic resin nanocomposite were studied by IR,TEM,SEM and thermoanalysis（TG and DSC）. This paper also investigated the mechanism of reaction and variety of nanocomposite. On the basis of this, the article researched the friction and wear properties of braze zone which prepared by modified phenolic resin nanocomposite. The experiments showed that the modified nanoparticle which particle size was distribution 30-300nm could disperse to phenolic resin equably,and the nanoparticle could shorten the time of gelation. The phenolic resin nanocomposite could satisfy the request of friction materials. Compared with ordinary phenolic resin, the nanocomposite improved many performance: the outstanding friction properties, steady friction coefficient, lesser wear rate, the ability of anti-heat fade, and all of this made the nanocomposite become high-powered friction materials.The structure and capability of nanocomposite was analyzed by thermoanalysis and friction analysis. The effect of reaction factors and molar ratio on the structure and performance of nanocomposite was studied. The results showed that the phenolic resin nanocomposite had superior thermostabity and pliability, could increase char yield. Through experiments in the laboratory , the optimum process conditions were defined.更多还原