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热退火对中空纤维气体分离膜结构及性能的影响

作者：牟庆迪，盛鲁杰，刘元法，任吉中

单位： 1. 大连工业大学纺织与材料工程学院，大连 116034；2. 洁净能源国家实验室，中国科学院大连化学物理研究所，大连 116023

关键词：气体分离；聚酰亚胺；中空纤维膜；热退火

DOI号：

分类号： TQ028.8

出版年,卷(期):页码： 2024,44(4):1-7

摘要：

在气体膜分离领域，中空纤维膜（Hollow Fiber Membranes, HFMs）因其较高的比表面积和装填率等被广泛应用。本文选用干-湿法纺丝工艺制备的BTDA-TDI/MDI（P84）共聚聚酰亚胺中空纤维膜为基膜，在P84 Tg（332.6℃）温度以下（250℃，300℃）对P84 HFMs进行热退火处理，研究其对中空纤维膜结构和气体分离性能的影响。与原始P84 HFMs相比，当热处理温度为250℃时，热退火后的P84 HFMs的气体分离性能变化不明显，但是拉伸强度和断裂伸长率明显下降。当热处理温度接近Tg时（300℃），热退火后P84 HFMs的拉伸强度和断裂伸长率保持不变，并且气体分离选择性明显提高，膜丝表面的缺陷减少。为了进一步了解在Tg以下的热退火过程对中空纤维膜结构及性能的影响，采用XRD、FTIR和HIM等表征方法进行探索。

In the field of gas membrane separation, hollow fiber membranes (HFMs) are widely used due to their high specific surface area and high filling ratio. In this paper, BTDA-TDI/MDI (P84) co-polyimide hollow fiber membranes were prepared by dry-wet spinning technology. The P84 HFMs were thermally annealed at 250℃ and 300℃, which were below the temperature of P84 Tg (332.6℃), to investigate the effect of thermal annealing procedure on the structure and gas separation performance of the HFMs. Compared with the pristine P84 HFMs, the gas separation properties of the thermally annealed P84 HFMs at 250℃ had negligible change, but their tensile strength and the elongation at break decreased significantly. When the thermal annealing temperature was close to Tg (at 300°C), the thermal annealing P84 HFMs could maintain the tensile strength and elongation at break. In addition, their gas separation selectivity was significantly improved, and the defects on the surface of P84 HFMs were reduced. To further investigate the effect of the sub-Tg thermal annealing process on the structure of the P84 HFMs, they were characterized by XRD, FTIR, HIM, and so on.

基金项目：

国家重点研发计划（2020YFC0862903）

作者简介：

牟庆迪（1997-），男，黑龙江克山人，硕士生，主要从事气体分离方面的研究.

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