Abstract

A series of fluorinated polyacrylate emulsion pressure-sensitive adhesives (PSA) with various lengths fluorinated side chains were synthesized by using n-butyl acrylate (nBA), acrylic acid (AA), 2-hydroxyethyl acrylate (HEA) together with three kinds of fluorine monomers trifluoroethyl methacrylate (TFEMA), hexafluorobutyl methacrylate (HFBMA) and dodecafluoroheptyl methacrylate (DFHMA). The influences of fluorocarbon chains’ length on the particle size of the latex, as well as on thermostability (DSC, TG) and surface properties (XPS, CA, AFM) of the PSA films were investigated. The results showed that T_g and thermal stability of the PSA were both increased with the introduction of F-monomers with various lengths of fluorinated side chains, and the shorter the side chain, the more the T_g and thermal stability increased. The XPS results indicated that the surface atom percentage of F element of film increased with the escalation of the length of fluorocarbon lateral chain, which results in the water contact angle and surface roughness increment of the PSA films. Finally, effects of fluorocarbon chains’ length on the adhesive properties (i.e. loop tack, peel strength and shear strength) of the fluorinated latex PSA were also evaluated.

摘要

以丙烯酸正丁酯（nBA）、丙烯酸（AA）、丙烯酸2-羟乙酯（HEA）和三种氟为原料，合成了一系列具有不同长度含氟侧链的含氟聚丙烯酸酯乳液压敏胶（PSA）。单体甲基丙烯酸三氟乙酯（TFEMA）、甲基丙烯酸六氟丁酯（HFBMA）和甲基丙烯酸十二氟庚酯（DFHMA）。研究了碳氟化合物链的长度对胶乳粒径以及PSA薄膜的热稳定性（DSC、TG）和表面性能（XPS、CA、AFM）的影响。结果表明，随着含氟侧链长度不同的 F-单体的引入，PSA 的T _g和热稳定性均得到提高，且侧链越短，T _g和热稳定性增加。XPS结果表明，随着碳氟化合物侧链长度的增加，薄膜中F元素的表面原子百分比增加，从而导致PSA薄膜的水接触角和表面粗糙度增加。最后，还评估了碳氟化合物链的长度对氟化胶乳PSA的粘合性能（即环粘性、剥离强度和剪切强度）的影响。