摘要
以线形聚苯乙烯(LPS)薄膜三臂星形聚苯乙烯(3SPS)薄膜作为研究对象,探讨了受限体系中高分子链界面吸附对高分子溶液膜界面稳定性的影响.实验结果表明,吸附在基底上的高分子链对薄膜去润湿的驱动力形成拖拽力,增大了薄膜去润湿的阻力.随着退火时间的延长,线形链和三臂星形链在基底上的吸附量逐渐增加,LPS和3SPS薄膜在丙酮蒸汽中由发生去润湿到稳定存在,孔边在薄膜去润湿过程中由不稳定转变为稳定,去润湿速度逐渐降低,平衡接触角逐渐减小.当退火时间相同时,3SPS薄膜在丙酮蒸汽中的去润湿速度比LPS薄膜更低;去润湿后3SPS薄膜在基底上的平衡接触角比LPS薄膜更小,3SPS薄膜的毛细驱动力小于LPS薄膜.
Abstract
Polymer films have broad applications in coatings,optoelectronic devices and sensing devices,with their interface stability being a key factor significantly affecting these applications.During the application of these films,stability not only in air but also under various environmental conditions,including in water or organic solvents is re-quired.To date,the systematic elucidation of the influence of solvent-restricted interface adsorption of polymer films on their stability has not been fully explored.In this work,focusing on linear polystyrene(LPS)films and 3-arm star-shaped polystyrene(3SPS)films,we explored the influence of polymer chain interface adsorption in confined systems on the interfacial stability of polymer solution films.We found in our experimental results that the polymer chains adsorbed on the substrate form a drag force,which drives the dewetting of the film and increases the resistance to film dewetting.As the annealing time increases,the adsorption of linear and 3-arm star-shaped chains on the substrate gradually increases,LPS and 3SPS films transit from instability to stability in acetone vapor,with the rim becoming stable during the film dewetting process,the dewetting speed gradually decreasing,and the equilibrium contact angle progressively decreasing.At the same annealing time,3SPS films exhibit a lower dewetting speed in acetone vapor than LPS films,and after dewetting,3SPS films on the substrate have a smaller equilibrium contact angle than LPS films,indicating that the capillary driving force of 3SPS films is less than that of LPS films.
基金项目
国家自然科学基金(22073093)
珠海市社会发展领域科技计划项目(22073093)
国家科技期刊平台
NSTL
万方数据