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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 预览

Toughening Cyanate Ester Resin by Using Poly(n-butyl acrylate)@Polymethyl Methacrylate Core-Shell Structured Polymer Particles
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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346nm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.
作者 翟乐 吉海峰 姚艳梅 瞿雄伟 ZHAI Le;JI Haifeng;YAO Yanmei;QU Xiongwei(Institute of Polymer Science and Engineering,Hebei University of Technology,Tianjin 300130)
出处 《材料导报》 EI CAS CSCD 北大核心 2019年第4期705-708,共4页 Materials Review
基金 河北省自然科学基金(E2016202036) 天津市科技计划项目(17YFCZZC00280).
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 cyanate ester resin acrylate ester core-shell structure seed emulsion polymerization toughening
作者简介 翟乐,女,1991年,2018年6月毕业于河北工业大学高分子化学与物理专业,获得理学硕士学位。研究方向为多相多组分聚合物体系;瞿雄伟,河北工业大学化工学院教授、博士研究生导师。1985年6月本科毕业于北京航空学院聚合物复合材料专业,1988年6月在成都科技大学获得高分子材料硕士学位,1999年6月在北京化工大学材料学专业获得博士学位,2004—2005年在英国曼彻斯特大学材料科学中心作访问学者。获国家发明专利23项,河北省技术发明一等奖1项,河北省省管优秀专家。主要研究兴趣在于核壳结构聚丙烯酸酯的可控合成及其在极性基础树脂中的增韧改性,以及增强和导热功能高分子材料的研究。xwqu@hebut.edu.cn.
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