成膜温度对共混乳胶膜梯度结构的影响

Effect of Film Forming Temperature on Blending Film’s Gradient Structure

摘要:

将平均粒径相近的含氟丙烯酸酯乳液（FAE）与丙烯酸酯乳液（AE）按质量比1:1共混，再将共混乳液分别于15℃、30℃、45℃、60℃下在聚四氟乙烯板（PTFE）上成膜。通过红外光谱（FI-IR）、粒度分布（PSA）、接触角（CA）、表面自由能、原子力显微镜（AFM）、扫描电镜（SEM）结合电子能谱（SEM-EDX）、X光电子能谱（XPS）、力学性能研究了成膜温度对共混乳胶膜自组织梯度结构和表面性能的影响。结果表明，FAE乳液与AE乳液共混后，共混乳液粒径降低，分布变宽。共混乳液成膜温度高于45℃时，膜断面出现相分层，F-P（膜-聚四氟乙烯基材）面的含氟组分浓度开始高于F-A（膜-空气）面，含氟组分在F-P面富集，具备纯含氟丙烯酸酯聚合物表面性能，F-A面氟组分含量少，其主要是丙烯酸酯聚合物组分。氟元素浓度从F-P面到F-A面减少，膜梯度结构及两面异性更显著。随温度的升高，乳胶膜的拉伸强度有显著的增大。

Abstract:

The blend emulsions were mixed with the similar particle size emulsions of fluorinated acrylate emulsion and acrylate emulsions at 1:1 mass ratio. The blend films were prepared on PTFE plate at 15℃、30℃、45℃、60℃, respectively. The effects of film forming temperature on the self-organized gradient structure and surface properties of blend films were studied by FI-IR、PSA、CA、surface free energy analysis、SEM、SEM-EDX、XPS and mechanical properties. The results showed that the blend emulsions’ particles sizes reduced, at the same time the particles distribution of blend emulsions widened. The fluorine content of the F-P film surface was higher than that of the F-A film surface when the film forming temperature was beyond 45℃, and the fluorinated acrylate polymer components were enriched in the F-P film surface, while the acrylate polymer components were enriched in the F-A film surface. The surface property of the F-P film surface of blend film was similar to the pure fluorinated acrylate polymer. The concentration gradient of fluorine component was reduced from the F-P film surface to the F-A film surface, and the gradient structure and two sides of the blend film were more obvious.With the increase of temperature, the tensile strength of latex film increased significantly.