预聚物复合助稳定剂条件下含氟丙烯酸酯共聚物的细乳液聚合  

Miniemulsion Polymerization by Predissolved Polymer as Costabilizer

作　　者：姚宁宁[1] 倪刚[1] 赵炜珍[1] 许美茹[1] 杜娟[1] 

机构地区：[1]宁夏大学化学化工学院,宁夏能源化工重点实验室,银川750021

出　　处：《高等学校化学学报》2011年第6期1401-1406,共6页Chemical Journal of Chinese Universities

基　　金：宁夏自然科学基金(批准号:NZ0718,NZ0815);宁夏大学自然科学研究基金(批准号:ZR0621);宁夏高等学校科学技术研究项目资助

摘　　要：以甲基丙烯酸三氟乙酯(TFMA)、苯乙烯(St)和丙烯酸丁酯(BA)为共聚单体,在十二烷基硫酸钠(SDS)/磺酸盐型阴离子氟表面活性剂(S100)/辛基苯基聚氧乙烯醚(OP-10)组成的乳化体系中,采用预聚物和十六醇(HDL)共同组成的复合助稳定剂,对细乳液聚合制备St/BA/TFMA三元共聚物的过程进行了研究.通过FTIR,1H NMR,DSC,TGA和GPC等方法对共聚物的结构与性质进行表征和确认.研究了影响细乳液聚合转化率和凝结率的各种因素,确定了复合乳化剂的用量为单体总量的3%～4%,配比为m(OP-10)∶m(SDS)∶m(S100)=2.5∶1∶0.35,预聚物和助乳化剂HDL的用量分别为单体总量0.5%和2%的条件下,可以制备出稳定性较好的细乳液体系,制备的乳胶膜具有良好的疏水性和耐候性.A steady miniemulsion copolymer of trifluoroethyl methacrylate（TFMA）,n-buty acrylate（BA） and styrene（St） was prepared by predissolved polymer and hexanediol（HDL） as a costabilizer,AIBN as initiator,SDS/S100/OP-10 as a complex emulsion system.The relationships of polymerization conditions between the final conversion and polymerization stability were discussed in detail.The optimal polymerization condition is 0.7%AIBN,2%HDL,0.5% predissolved polymer and m（OP-10）：m（SDS）：m（S100）=2.5：1：0.35.The molecular weight and composition of copolymer were demonstrated by GPC,FTIR,1H NMR,DSC and TGA.The results show that HFMA is effectively involved in the copolymerization,the fluorinated acrylate copolymer has a narrower molecular weight distribution.Add a small amount of predissolved polymer can not only improved the emulsion stability but also improved the hydrophobic properties of latex films.After perfluoroalkyl groups were introduced into polymer chains,the wetting-resistance,the water-resistance and the thermal stability of the latex films were evidently enhanced.

关 键 词：细乳液聚合 含氟丙烯酸酯 助稳定剂 乳胶膜 预聚物 

分 类 号：O631.4[理学—高分子化学]