利用聚丙烯酸正丁酯@聚甲基丙烯酸甲酯核/壳结构聚合物增韧氰酸酯树脂  

Toughening Cyanate Ester Resin by Using Poly(n-butyl acrylate ) @ Polymethyl Methacrylate Core-Shell Structured Polymer Particles

作　　者：翟乐 吉海峰 姚艳梅[1] 瞿雄伟[1] ZHAI Le;JI Haifeng;YAO Yanmei;QU Xiongwei(Institute of Polymer Science and Engineering,Hebei University of Technology,Tianjin 300130)

机构地区：[1]河北工业大学高分子科学与工程研究所,天津300130

出　　处：《材料导报》2019年第4期705-708,共4页Materials Reports

基　　金：河北省自然科学基金(E2016202036);天津市科技计划项目(17YFCZZC00280)~~

摘　　要：采用半连续种子乳液聚合方法制备了以聚丙烯酸正丁酯(PBA)为核、聚甲基丙烯酸甲酯(PMMA)为壳、粒径为346 nm的核/壳型改性剂(Poly(BA)/Poly(MMA)),简称PBMMA,改变两种单体的质量比分别为:60/40、65/35、75/25、70/30、80/20,以及调整添加量研究其对氰酸酯树脂(CE)的增韧改性效果。结果表明,该种子乳液聚合反应具有很高的瞬时转化率(> 90%)和总转化率(> 95%),且改变核/壳质量比对乳液聚合反应过程没有影响。经透射电镜表征发现,PBMMA乳液有明显的核/壳结构。对CE/PBMMA共混物进行了力学性能测试,用扫描电镜观察其断裂表面形貌,并利用动态力学分析研究了CE/PBMMA共混物的分子运动。当核/壳质量比为60/40、添加量为5%(质量分数)时,增韧剂PBMMA在基体中均匀分散并出现脆性-韧性转变点。CE/PBMMA共混物的抗冲击强度是纯CE树脂的3. 78倍,力学性能与断面SEM观察结果一致。Aseries of core-shell structured poly( n -butyl acrylate)@poly(methyl methacrylate)(named PBMMA) impact modifiers differing in core/shell weight ratio (60/40,65/35,75/25,70/30,to 80/20) with an average particle size of 346 nm were prepared by seed emulsion polymerization.The toughening effects of the core-shell structured particles with various compositions and under different adding amounts toward cyanate ester (CE) resin were investigated.It was found that the polymerization had a very high instantaneous conversion (90wt%) and overall conversion (95wt%).The PBMMA latexes had an obvious core-shell structure confirmed by transmission electron microscope,and the weight ratio of core/shell had inconspicuous influence on the seed-emulsion polymerization process.The mechanical properties of the PBMMA/CE blends were evaluated,and scanning electron microscope (SEM) was used to observe the fractured surface morphology.We also conducted the dynamic mechanical analysis by which the molecular movement of the CE/PBMMA blends could be revealed.The results showed that PBMMA can be dispersed well in the matrix,and the brittle-ductile transition point emerges under an appropriate value of the core-shell weight ratio (60/40) and the adding amount of the core-shell structured particles (5wt%).As a result,the PBMMA/CE blend was determined to have a high impact strength which is 3.78 times of pure CE resin.The mechanical properties agreed well with the SEM observation.

关 键 词：氰酸酯树脂 丙烯酸酯聚合物 核壳结构 种子乳液聚合 增韧 

分 类 号：TQ323.9[化学工程—合成树脂塑料工业]