纳米受限作用对聚醚砜薄膜物理老化的影响

Influence of nano-confinement effect on physical aging of PES films

采用旋涂法及浇铸法制备了不同厚度的聚醚砜(PES)薄膜。通过测定薄膜对氧气的透过率研究薄膜厚度对PES物理老化性能的影响;控制薄膜的物理老化温度分别为45,55,65℃,时间超过400天。结果表明:膜越薄、物理老化温度越高,则PES的老化速度越快。采用透射电子显微镜观察发现:50 nm厚的PES薄膜在65℃物理老化过程中可形成某种局部有序的凝聚态结构;而50μm厚的PES薄膜没有明显的局部有序结构。

Polvelher sulfone （PES） films were made by spin-coaling PES solutions and solution easting on lhe silivon wafer. The effect of film thicknesses on the physical aging behavior of PES films was h＇aeked by using oxygen permeability ineasurelnenls. The PEG films were subjeeled to isothermal aging al 45.55.65 ℃ for more than 400 days. The experimental resulls shrew lhal the thin films is noted for greally accelerated physical aging compared to the thick films of the same polymer, and the higher the physical aging lemperature, lhe more rapidly the physieal aging rale can be observed during physical aging. One ordered phase mierostructure can form druing physical aging for PES fihn with 50 nm thickness while the fihn with 50 btm thickness has no obvious ordered structure.