To provide insight into the formation process of carbon molecular sieve (CMS) hollow fiber membranes (HFMs), P84 co-polyimide HFMs were thermally treated at 200, 250, 300, 350, 400, 550, 650, and 800 °C. TG-MS was used to study the weight loss and released gases at all temperatures. In situ SEM, HIM (helium ion microscope) and in situ XRD were used to investigate the structural evolution of P84 HFMs. The structural evolution and changes in the mechanical properties and gas separation performance of P84 HFMs from the polymer to the carbon stages were divided into three stages (sub-T_g, intermediate, and carbon stages) by their T_g (322 °C) and T_d (460 °C). The substructure of P84 HFMs began to collapse during the intermediate stage, which impeded the gas permeance of P84 CMS HFMs. At the carbon stage, the permeance of CO₂, O₂, N₂, and CH₄ decreased with the increased carbonization temperature; however, the H₂ permeance reached a maximum at 650 °C due to the partial pyrolysis and structural reorganization of P84 CMS HFMs.

为了深入了解碳分子筛（CMS）中空纤维膜（HFM）的形成过程，对P84共聚酰亚胺HFM进行了200、250、300、350、400、550、650和800°C的热处理。TG-MS用于研究在所有温度下的重量损失和释放的气体。原位扫描电镜，HIM（氦离子显微镜）和原位XRD被用来研究P84 HFM的结构演变。从聚合物到碳阶段的P84 HFM的结构演变以及机械性能和气体分离性能的变化按其T _g（322°C）和温度分为三个阶段（亚_Tg，中间和碳阶段）。Ť _d（460℃）。P84 HFM的子结构在中间阶段开始坍塌，这阻碍了P84 CMS HFM的气体渗透。在碳阶段，随着碳化温度的升高，CO ₂，O ₂，N ₂和CH ₄的渗透率降低。然而，由于P84 CMS HFM的部分热解和结构重组，H _2的渗透率在650°C达到最大值。