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

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F...

Miniemulsion Polymerization by Predissolved Polymer as Costabilizer

A steady miniemulsion copolymer of trifluoroethyl methacrylate(TFMA), n-buty acrylate(BA) and styrene(St) was prepared by using predissolved polymer and hexanediol (HDL) as a costabilizer, AIBN as initiator, SDS/S100/OP 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):m(SDS):m(S100) = 2.5:1:0.3. The molecular weight and composition of copolymer were demonstrated by GPC, FT-IR, 1H-NMR, DSC and TGA. The result was showed 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.