AAS核壳结构共聚物的制备及其改性SAN树脂的性能  

Preparation and Application in Toughening SAN Resin of BA/St-co-AN Core-Shell Structured Copolymer

作　　者：赵海燕[1] 王江涛[1] 赵惠珠[1] 解金鹏[1] 张立群[2] 瞿雄伟[1] 

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 [2]北京化工大学材料科学与工程学院,北京100074

出　　处：《高分子材料科学与工程》2011年第1期9-11,16,共4页Polymer Materials Science & Engineering

基　　金：河北省自然科学基金资助项目(E2010000107)

摘　　要：随着社会对环保问题的关注,乳液聚合用于脆性聚合物的改性研究越来越受到重视。文中采用种子乳液聚合方法制备了核壳结构聚丙烯酸丁酯/苯乙烯-丙烯腈共聚物(PBA/AS,简称AAS),单体总转化率达99.35%,乳胶粒理论粒径与实测值基本一致,说明该体系没有明显的二次成核过程。当乳胶粒粒径在326 nm、橡胶质量分数为15%时,AAS改性苯乙烯-丙烯腈共聚物的共混体系发生明显的脆-韧转变,而拉伸强度保持较高的值。DMA谱图表明,随橡胶相含量的增大,两相转变峰越来越接近,相容性提高;SEM观察证实了这种力学性能的转变。n-butyl acrylate/styrene-co-acrylonitrile structured core/shell copolymer（AAS） was prepared by seeded emulsion polymerization.Gravimetric analysis was used to measure the conversion of monomer to polymer throughout the reactions and revealed that the polymerizations had proceeded under monomer-starved conditions （the instantaneous conversion93%）.The good agreement shown between experimental and theoretical particle diameters throughout the polymerization for all latexes provides strong evidence that the particles are grown without significant secondary nucleation and all the polymer particles formed are spherical.The molecular movements of AAS/ acrylonitrile-co-styrene blends with different PBA contents were characterized by dynamic mechanical analysis（DMA）.The low Tg1s,corresponding to that of poly（n-butyl acrylate）（PBA） are changed slightly,while the high Tg2s,corresponding to that styrene-co-acrylonitrile copolymer,are changed greatly.This shows the significant gradient layer is formed at the surface of core and shell layers.The AAS/SAN blend occurrs from the brittle fracture to ductile one when the PBA content accounts for about 15%,and the tensile strength keeps relative high values.The SEM observation proves results of mechanical properties.

关 键 词：种子乳液聚合 核壳结构共聚物 改性苯乙烯-丙烯腈共聚物 力学性能 

分 类 号：TQ316.342[化学工程—高聚物工业]