含氟二元共混乳液形成梯度结构膜研究  

Study of Gradient Structure in the Blend Latex System

作　　者：胡园园[1] 张粉霞[1] 陈艳军[1] 陈冬梅[1] 张超灿[1] 

机构地区：[1]武汉理工大学材料科学与工程学院,武汉430070

出　　处：《武汉理工大学学报》2015年第4期33-37,共5页Journal of Wuhan University of Technology

基　　金：高等学校博士学科点专项科研基金(20120143110002);中央高校基本科研业务费专项资金资助项目(2012-IV-005)

摘　　要：用乳液聚合方法合成了3种表面能及氟含量一致但链段运动能力不同的的含氟丙烯酸酯聚合物,将这3种聚合物乳液与同一种普通丙烯酸酯共聚物乳液以相同的比例共混后成膜并进行了适当的热处理,研究了热处理温度及共混组分软硬差别对膜断面梯度结构的影响。通过对共混膜表面性能和断面结构的表征发现:共混两组分有软硬差别时,含氟组分硬(Tg高),成膜时未能扩散更有利于共混膜热处理后形成沿厚度方向的氟浓度梯度结构,且在稍低于粘流温度的150℃热处理能得到最好的梯度结构;没有软硬差别的共混两体系比有软硬差别的共混体系更容易在成膜后的热处理过程中形成沿膜厚度方向的氟浓度梯度。Three kinds of fluorinated polyacrylate lattices with different glass-transition temperatures and same surface free energy were prepared by batch emulsion polymerization, and then, these three lattices were blend with the same no~ fluorinated polyacrylate eopolymerization latex. The blend latties were dried on the glass and annealed some time. The Tg effect of polymers and the heat treatment temperature of films were studied by contact angle measurement and SEM- EDS. The experimental results showed that the gradient structure formed across the section direction of the films after annealed at 150 ℃ while the fluorinated emulsion with harder （higher Tg） particles than that of fluorine-free polyacrylate emulsion, or after annealed at 190℃ while the two component of the blend system with close Tg.

关 键 词：含氟丙烯酸酯聚合物 梯度结构 热处理 共混 链段运动 

分 类 号：O631[理学—高分子化学]