摘要
为了实现拉挤工艺成型纤维增强聚甲基丙烯酸甲酯(PMMA)复合材料的生产,采用了不同的助剂来调控PMMA聚合反应过程,改善甲基丙烯酸甲酯(MMA)单体的本体聚合。其中邻苯二甲酸二丁酯(DBP)作为增塑剂,N,N-二甲基苯胺(DMA)和乙酸丁酯(BAC)作为反应调整助剂,将各种助剂以一定比例混入树脂体系中进行聚合。首先将各树脂体系在60℃进行20 min预聚合得到预聚体,再对不同体系的预聚体进行差示扫描量热(DSC)测试和反应动力学分析。结果表明,在不同升温速率(β)下,加入DMA体系的反应起始温度都有所降低,DMA能够加快聚合初期的反应进程,而加入BAC则使得β为25℃/min时的反应温度区间从36.1℃提高到41.3℃。使用Kissinger法和Ozawa法进行拟合分析,得到各体系反应的平均活化能(Ea),其中加入DMA使得体系Ea降低至40.71 kJ/mol,比未添加反应调整助剂的体系下降了16.9%。最终用各体系树脂进行拉挤实验,发现仅有添加了BAC的体系能够生产质量合格的产品。在拉挤工艺生产纤维增强PMMA复合材料过程中,加入一定量BAC助剂能够减缓树脂聚合集中放热,提高产品质量。
In order to achieve the production of fiber reinforced polymethyl methacrylate(PMMA)composites through pultrusion process,different additives were used in the experiment to regulate the polymerization process of PMMA and improve the bulk polymerization of methyl methacrylate(MMA)monomer.Among them,dibutyl phthalate(DBP)was used as a plasticizer,N,Ndimethylaniline(DMA)and butyl acetate(BAC)were used as polymerization reaction adjustment additives,and various additives were mixed into the resin system in a certain proportion for polymerizing.Firstly,the prepolymerization of each resin system was done at 60℃for 20 min to obtain prepolymers.Then,differential scanning calorimetry(DSC)and reaction kinetics analysis were performed on the prepolymers of different systems.The results indicate that the reaction initiation temperature of the system with addition of DMA at different heating rates(β)decreases,and DMA can accelerate the reaction process in the initial stage of polymerization.Whenβis 25℃/min,adding BAC increases the reaction temperature range from 36.1℃to 41.3℃.The Kissinger method and Ozawa method were used for fitting analysis to obtain the average activation energy(Ea)of each system reaction.The addition of DMA reduces the Ea of the system to 40.71 kJ/mol,which is 16.9%lower than the system without the addition of an adjustment additive.Finally,pultrusion experiments were conducted using various resin systems.It is found that only the system with added BAC is able to produce products with qualified quality.Adding a certain amount of BAC additive in the production of fiber reinforced PMMA composite materials through pultrusion process can slow down the concentrated heat release of resin polymerization and improve product quality.
作者
曾鑫志
师俊峰
关静
刘佩佩
杨威
张彦飞
ZENG Xinzhi;SHI Junfeng;GUAN Jing;LIU Peipei;YANG Wei;ZHANG Yanfei(School of Materials Science and Engineering,North University of China,Taiyuan 030051,China;Guodian United Power Technology Co.,Ltd.Beijing Management Service Branch,Beijing 100080,China;Zhongfu Carbon Fiber Core Cable Technology Co.,Ltd.,Lianyungang 222042,China)
出处
《工程塑料应用》
CAS
CSCD
北大核心
2024年第6期142-148,169,共8页
Engineering Plastics Application
关键词
聚甲基丙烯酸甲酯
反应动力学
自由基聚合
本体聚合
拉挤工艺
polymethyl methacrylate
reaction kinetics
free radical polymerization
bulk polymerization
pultrusion
