聚醋酸乙烯酯反向核壳结构乳胶粒制备及形成机制  

Fabrication and Formative Mechanism of Poly( Vinyl Actate)-Based Inverse Core/Shell Structural Latex Particles

作　　者：张霄[1] 白龙[1] 娄春华[2] 李铁强[1] 顾继友[1] 李志国[1] 

机构地区：[1]东北林业大学材料科学与工程学院,黑龙江哈尔滨150040 [2]齐齐哈尔大学材料与工程学院,黑龙江齐齐哈尔161006

出　　处：《高分子材料科学与工程》2016年第2期150-154,共5页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(31270609,31570557);教育部博士点基金(373-20130062110002);黑龙江省博士后科研启动基金(LBH-Q14004);黑龙江省自然科学基金资助项目(E201230);中央高校基本科研业务费基金(2572015AB01)

摘　　要：以马来酸酐(MA)作为接枝共聚单体,亲水性的聚醋酸乙烯酯(PVAc)为核,疏水性的聚苯乙烯(PSt)为壳,成功构建出一种新颖的PVAc-MA/PSt反向异形核壳结构乳胶粒,从而解决了因竞聚率差异大而无法实现醋酸乙烯酯(VAc)与苯乙烯(St)复合的难题。同时,利用接枝共聚所形成的过渡层,能够很好地抑制核壳翻转,从而成功地解决了反向核壳结构乳胶粒容易发生核壳翻转的问题。所制备出的反向核壳结构乳胶粒子平均粒径为330 nm左右,粒径大小均一。通过热力学分析发现所制备的乳胶粒呈明显的相分离结构,且存在PVAc-MA-PSt过渡层结构;乳胶粒的形貌随着MA含量的变化发生明显的衍变趋势,且粒子形貌变化可控。提出了PVAc-MA/PSt反向核壳乳胶粒子的形成机制。Using maleic anhydride（ MA） as graft-copolymeric monomer,a novel inverse anomalous core / shell latex particle of PVAc-MA / PSt was successfully structured with hydrophilic poly（ vinyl acetate）（ PVAc） as core and hydrophobic polystyrene（ PSt） as shell by semi-continuous seed emulsion polymerization. Based on this,the compound difficulty owing to the reactivity ratio difference and the influence of ＂core / shell turning＂due to hydrophilic difference between vinyl acetate and styrene of the two monomer can be eliminated. The particle size of the latex particles is 330 nm and has a uniform distribution. The special structure of core / shell latex particle,the phase separation structure and transition layer structure that was comprised of PVAc-MA / PSt compound,was revealed by thermodynamic analysis. Meanwhile,electron microscopic analysis show that the morphology of latex particle has an evolving tendency and the latex morphology could be controlled by the changing of MA content. Finally,the formation mechanism of PVAc-MA / PSt inverse core / shell latex particle was proposed.

关 键 词：聚醋酸乙烯酯 反向核壳 马来酸酐 过渡层 形成机制 

分 类 号：TQ325.5[化学工程—合成树脂塑料工业]