氟含量对含氟丙烯酸酯共混乳胶膜梯度结构和表面性能的影响  

EFFECT OF FLUORINATED POLYACRYLATE CONTENT ON THE GRADIENT STRUCTURE AND SURFACE PROPERTY OF FLUORINATED/NON-FLUORINATED POLYACRYLATE LATEX BLEND FILMS

作　　者：胡园园[1] 张超灿[1] 陈艳军[1] 胡亮[1] 范亚男[1] 

机构地区：[1]武汉理工大学材料科学与工程学院高分子材料系,武汉430070

出　　处：《高分子学报》2011年第8期838-844,共7页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号50673080)资助项目

摘　　要：首先将制备出的平均粒径较小的含氟丙烯酸酯均聚物乳液与平均粒径较大的纯丙烯酸酯共聚物乳液按不同的比例(1/9,2/8,3/7,4/6,5/5)共混,接着将各共混乳液在室温下(20℃)玻璃基材上干燥后,于110℃/210℃下热处理一段时间.运用接触角法,XPS、AFM、SEM-EDX等详细研究了共混乳胶膜中含氟组分含量对膜自组织形成的梯度结构和表面性能的影响.研究结果表明,当共混体系中氟组分含量达到30 wt%后,室温成膜后在整个膜与空气界面都有足量含氟乳胶粒富集,膜与玻璃界面几乎无含氟粒子,经110℃退火2 h后膜与空气接触面被含氟组分占据,具备纯含氟丙烯酸酯表面性能,含氟组分从膜与空气接触面到膜与玻璃接触面浓度梯度减少,膜与玻璃接触表面主要是纯丙烯酸酯聚合物组分.另外,增加体系中氟组分含量高于30 wt%,可以使膜厚方向上氟组分的浓度梯度结构尺度更大,但膜与玻璃界面的氟含量也会略有增加,而过低(<30 wt%)的氟组分含量使膜中梯度结构及两界面异性不明显.In order to obtain the gradient fluorinated/non-fluorinated polyacrylate latex blend films as cheap as possible,the fluorinated polyacrylate emulsion with small particle size was synthesized by bulk emulsion polymerization method,the acrylate copolymer emulsion with big particle size was synthesized by semicontinuous emulsion polymerization method,and then the fluorinated polyacrylate emulsion and the acrylate copolymer emulsion were mixed with a series of ratios（1/9,2/8,3/7,4/6,5/5）.The blend latices were dried on clean glass at 20℃ and then annealled at 110℃/210℃ for some time（2~6 h）.The effects of the fluorinated polyacrylate content on the gradient structure and surface property of the blend films were discussed.The content of fluorine on the film surface and the film section was analyzed by XPS,SEM-EDX.The surface properties and morphology were characterized by contact angle measurements and AFM.It was found that,while the content of fluorinated polyacrylate latex in the blend system was up to 30 wt%,the small and hard fluorinated polyacrylate particles were selectively gathered on the film-air interface after film-formation at room temperature,and the fluorine content increased from the film-glass interface to the film-air interface gradually in the blend films annealled 2 h at 110℃.The obtained gradient film has low surface free energy as the pure fluorinated polyacrylate and strong adhesion as the pure polyacrylate.The further increasing of fluorinated polyacrylate in the blend system helped the formation and enlargement of gradient structure,but the adhesion of film was decreased a little.The emulsion system with the content of fluorinated polyacrylate latex under 30 wt% was hard to form gradient structure.

关 键 词：含氟丙烯酸酯 自组织 梯度 乳液共混 乳胶粒 

分 类 号：O631.3[理学—高分子化学]