Li Guoqiang, Knozowska Katarzyna, Kujawa Joanna, Tonkonogovas Andrius, Stankevičius Arūnas, Kujawski Wojciech
Faculty of Chemistry, Nicolaus Copernicus University in Toruń, 7, Gagarina Street, 87-100 Toruń, Poland.
Lithuanian Energy Institute, 3, Breslaujos Street, LT-44403 Kaunas, Lithuania.
Polymers (Basel). 2021 Feb 28;13(5):756. doi: 10.3390/polym13050756.
The development of thin layer on hollow-fiber substrate has drawn great attention in the gas-separation process. In this work, polydimethysiloxane (PDMS)/polyetherimide (PEI) hollow-fiber membranes were prepared by using the dip-coating method. The prepared membranes were characterized by Scanning Electron Microscope (SEM), energy-dispersive X-ray spectroscopy (EDX), and gas permeance measurements. The concentration of PDMS solution and coating time revealed an important influence on the gas permeance and the thickness of the PDMS layer. It was confirmed from the SEM and EDX results that the PDMS layer's thickness and the atomic content of silicon in the selective layer increased with the growth in coating time and the concentration of PDMS solution. The composite hollow-fiber membrane prepared from 15 wt% PDMS solution at 10 min coating time showed the best gas-separation performance with CO permeance of 51 GPU and CO/N ideal selectivity of 21.
中空纤维基底上薄层的发展在气体分离过程中引起了极大关注。在本工作中，采用浸涂法制备了聚二甲基硅氧烷（PDMS）/聚醚酰亚胺（PEI）中空纤维膜。通过扫描电子显微镜（SEM）、能量色散X射线光谱（EDX）和气体渗透性能测量对制备的膜进行了表征。PDMS溶液浓度和涂层时间对气体渗透性能以及PDMS层厚度有重要影响。从SEM和EDX结果证实，随着涂层时间的延长和PDMS溶液浓度的增加，PDMS层的厚度以及选择性层中硅的原子含量增加。在10分钟涂层时间下由15 wt% PDMS溶液制备的复合中空纤维膜表现出最佳的气体分离性能，CO渗透性能为51 GPU，CO/N理想选择性为21。
