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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.
First of all prepared the smaller average particle size of the fluorine-containing acrylate homopolymer emulsion and the average particle size of pure acrylic copolymer emulsion at different ratios (1 / 9,2 / 8,3 / 7,4 / 6,5 / 5), and then the blend emulsions were dried on a glass substrate at room temperature (20 ° C) and then heat-treated at 110 ° C / 210 ° C for a time.The contact angles, XPS, AFM, SEM-EDX and other detailed study of the latex film containing fluorine content of the film self-organization of the gradient structure and surface properties of the results show that when the fluorine content of the blend system reaches 30 wt% After the film was formed at room temperature, there were enough fluorine-containing latex particles enriched in the interface between the film and the air, almost no fluorine particles existed at the interface between the film and the glass, and the interface between the film and the air was occupied by the fluorine- With pure fluorine acrylate surface properties, fluorine-containing components from the membrane to the air contact surface to the membrane and the glass contact surface concentration gradient decreases, the membrane and the glass surface is mainly pure acrylate polymer component.In addition, the increase in the system of fluorine When the content of the component is higher than 30 wt%, the concentration gradient of the fluorine component in the film thickness direction can be made larger, but the difference between the film and the glass The fluorine content in the interface also increases slightly, while the content of fluorine (<30 wt%) is not obvious because of the gradient structure and the interface anisotropy in the film.