吲哚基聚醚砜超薄膜的制备与性能研究

Study on preparation and peerformance of indole-based polyethersulfone ultrathin film

以4-羟基吲哚和4,4’-二氟二苯砜为原料制备吲哚基聚醚砜(PESI),采用旋涂法制备PESI超薄膜,研究结果表明,PESI超薄膜的厚度与聚合物的含量有关。当PESI的质量浓度为10mg/mL时,PESI超薄膜的厚度仅为38nm。采用浸泡法将Mg2+引入聚合物体系中,通过吲哚和Mg^(2+)间的"点-面"阳离子-π相互作用构筑PESI-Mg^(2+)聚合物薄膜,与PESI薄膜相比,其拉伸强度提高了45.9%,断裂伸长率提高了27.9%。理论模拟进一步确定了PESI和Mg^(2+)间存在阳离子-π相互作用。

The indole-based polyethersulfone (PESI) was prepared by using 4-hydroxyindole and 4,4’-difluorodiphenylsulfone as raw materials.The PESI ultrathin film was prepared by the spin coating method.The study results show that the thickness of PESI ultrathin film is related to the content of polymer.When the mass concentration of PESI is 10mg/mL,the thickness of the PESI ultrathin film is only 38nm.The Mg^(2+) was introduced into the polymer system by using immersing method,and the PESI-Mg^(2+) polymer film was constructed through the “point-surface” cation-π interaction between indole and Mg^(2+).Compared with the PESI film,its tensile strength increased by 45.9%,and the elongation at break increased by 27.9%.The theoretical simulation further confirmed the existence of the cation-π interaction between PESI and Mg^(2+).