γ甲基丙烯酰氧丙基三甲氧基硅烷%2f丙烯酸酯、苯乙烯共聚合反应的研究.pdf

摘要摘要以含碳碳双键的有机硅氧烷活性单体和丙烯酸酯、苯乙烯类单体共聚可以对聚合物进行改性,共聚物在使用过程中硅氧烷部分水解缩合形成自交联的网状结构,提高了其耐水性、耐溶剂性和耐污性,成为具有优异性能的新材料。本文分别采用溶液聚合法和乳液聚合法,(TMSPMA)改性的丙烯酸酯、苯乙烯共聚物,并对其结构进行了表征。(1)采用溶液聚合法,以乙酸丁酯为溶剂,制备了甲基丙烯酸甲酯(MMA) ffMSPMA共聚物。用红外光谱仪、核磁共振仪和热重分析仪对共聚物进行了表征。研究了反应温度、引发剂浓度对溶液聚合转化率的影响。结果表明:红外谱图中1085 cm"1 =,都证明 TMSPMA已经与MMA共聚;升高反应温度、延长反应时间和增大引发剂浓度都提高了聚合反应转化率;未交联的共聚物熟稳定性随TMSPMA浓度增加而下降;有机硅烷交联后,共聚物(单体浓度比16:1)的起始分解温度为250℃,具有较高的热稳定性。(2)以阴离子型乳化荆十二烷基硫酸钠(SDS)和非离子型乳化剂辛基酚聚氧乙烯醚()为复合乳化剂(SDS/),通过乳液共聚合反应分别制备了有机硅改性的MMA/丙烯酸丁酯(BA)乳液和苯乙烯(St)/BA乳液。用红外光谱仪和热重分析仪对共聚物进行了表征。结果表明tTMSPMA与MMA/BA、St/BA发生了有效的共聚合反应;加入TMSPMA后,提高了共聚物的起始热分解温度。并对乳液共聚合体系表观动力学进行了初步研究;测定了反应温度、引发剂、乳化剂用量以及TMSPMA摩尔浓度对乳液共聚合反应速率的影响,得到了聚合反应的表观活化能和表观动力学方程。关键词有机硅丙烯酸酯苯乙烯溶液聚合乳液聚合 Abstract 鲁皇詈皇皇詈曼!皇詈皇皇!!!曼!!!!詈詈鼍皇皇I Abstract The eopolymers anosilicone,acrylate and(or)styrene(St)were synthesized by eopolymerization inorder tomodify part ofthepolymer was hydrolyzed toform self CROSS—linked reticulate structure intheusing process inorder tO improve thewater-resistant and solvent-resistant performance. In this dissertation,the copolymer modified by 3-(trimethoxysilyl)propyl methacrylate(TMSPMA)was synthesized by solutionand emulsion polymerization, respectively. (1)Thecopolymer ofmethylmethacrylate(MMA)and TMSPMA Wassynthesized by solution polymerization usingn-Butyl acetate ofreaction temperature and concentration of initiator on the conversion ofsolutionpolymerization were resultanteopolymers were characterizedby Fourier transforminfraredfiT-m)spectrometer, nuclear ic resonance(NMR)spectrometer and+thermalgravimetric frG)analyzer, resultsshow thatTMSPMA haseopolymerized withMMA because ofthe appearance oftheabsorption peal(at 085 em。1(Si-O-Cbond)in IRspectrum andthe resonance pe呔at&--O.******@hydrogen nucleus ofSi)in 1H-NMR conversion of polymerization isincreased谢th theincreasing ofthepolymerization temperature,time an