纤维增强PCBT复合材料的制备与性能研究

发布时间：2018-02-22 03:37

  本文关键词： CBT 玻璃纤维 玄武岩纤维 表面处理 复合材料　出处：《江苏科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：环形对苯二甲酸丁二醇酯CBT(Cyclic Butylene Terephthalate)是一种新型树脂,它是特殊的大环寡聚酯结构,有粘度低、快速聚合、可热成型、无反应热以及无VOC和释放物等优良性能,并且具有多种成型方法,是可以采用热固性树脂加工方法进行加工的热塑性树脂;同时以由CBT聚合后得到的PCBT(Poly Cyclic Butylene Terephthalate)为基体的热塑性复合材料具有较好的抗冲击性、较高的强度和可回收利用性,作为热塑性树脂界的新星,它在复合材料领域中有着广阔的发展空间。采用热压成型法制备玻璃纤维/PCBT复合材料。研究了玻璃纤维表面处理工艺、催化剂的用量、模压温度、模压压力、模压时长以及树脂和纤维的质量比对复合材料力学性能的影响,找出最佳工艺。PCBT的结晶度和分子量随催化剂用量的增加先增大后降低,当催化剂用量为0.4%wt时,PCBT的结晶度和分子量最大,同时复合材料的力学性能最优。反应温度升高,聚合产物的结晶度和粘均分子量也逐渐升高并趋向于平稳,当温度达到210℃时,聚合产物PCBT的结晶度和粘均分子量达到较大值。聚合时间对聚合产物的分子量和结晶度影响不大,但增加模压时间,对复合材料的弯曲强度有较明显的提高。经过偶联剂处理后,界面结合力有明显的提高,复合材料的力学性能得到提升。随着模压压力的增大,复合材料的力学性能增大,当模压压力为5MPa时,复合材料的力学性能最好。通过对不同原料配比条件下的产物力学性能测试及扫描电镜观察,表明玻璃纤维与CBT比为1:1时,原料结合性最好,同时力学性能较高。采用热压成型法制备玄武岩纤维/PCBT复合材料。探究玄武岩纤维表面处理工艺,研究了偶联剂的浓度,模压温度、模压时长以及压力对复合材料性能的影响。随着聚合时间的加长,产物分子量先增大后趋向平稳,当聚合温度为210℃,聚合时间为60min时,PCBT的分子量最大,为最佳聚合条件。模压压力的大小对复合材料中树脂的含量产生重要影响,当模压压力为4MPa时,复合材料的力学性能最优。碱刻蚀处理对玄武岩纤维力学性能有一定的损耗,但提高了复合材料的力学性能。碱刻蚀和偶联剂联合处理能够有效提高玄武岩纤维与树脂的结合性,宏观上提高复合材料的力学性能。
[Abstract]:Butanediol terephthalate (CBT(Cyclic Butylene Terephthalate) is a new type of resin. It is a special macrocyclic oligomer with low viscosity, rapid polymerization, thermoforming, no reaction heat and no VOC and release. There are many molding methods, which can be processed by thermosetting resin, and the thermoplastic composite based on PCBT(Poly Cyclic Butylene Terephthalate, which is polymerized by CBT, has good impact resistance. As a new star in the field of thermoplastic resin, it has a wide development space in the field of composite materials. Glass fiber / PCBT composites were prepared by hot pressing method. The surface treatment process of glass fiber was studied. The effects of the amount of catalyst, molding temperature, molding pressure, molding time and the mass ratio of resin to fiber on the mechanical properties of composites were investigated. The crystallinity and molecular weight of PCBT increased first and then decreased with the increase of catalyst dosage. When the amount of catalyst is 0.4wt, the crystallinity and molecular weight of PCBT are the largest, and the mechanical properties of the composites are the best. When the reaction temperature increases, the crystallinity and viscosity average molecular weight of the polymerization products increase and tend to be stable, and when the temperature reaches 210 鈩，

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