原位接枝改善聚二甲基硅氧烷膜用于 CO2 分离的聚丙烯腈中空纤维支撑膜的极性。

In-situ grafting to improve polarity of polyacrylonitrile hollow fiber-supported polydimethylsiloxane membranes for CO separation.

机构信息

State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.

出版信息

J Colloid Interface Sci. 2018 Jan 15;510:12-19. doi: 10.1016/j.jcis.2017.09.048. Epub 2017 Sep 14.

DOI:10.1016/j.jcis.2017.09.048

Abstract

Surface grafting modification was proposed to improve the surface polarity of polyacrylonitrile hollow fiber-supported polydimethylsiloxane (PDMS) membrane. The initiator 3-aminopropyltriethoxysilane containing one amine group was integrated into PDMS, and polyvinyl pyrrolidone (PVP) with strong polarity was connected to the surface by reacting with amine groups. Surface grafting modification was proven on X-ray photoelectron spectroscopy. The sharp decrease (from ∼98° to ∼28°) in water contact angle of the PDMS membrane indicated the significant improvement in surface polarity after the modification. The surface roughness of the PDMS membrane increased with the modification, and the PDMS surface immersed for 40s was almost covered with PVP. The membrane immersed in PVP solution for 10s improved CO/H, CO/CH, and CO/N selectivities. While CO permeance slightly decreased from ∼2500 GPU to ∼2440 GPU. For the separation of CO/CH and CO/N mixed gases, all CO/CH and CO/N selectivities were improved after the modification. For the separation of CO/H mixed gas, CO/H selectivity was improved when the immersion time was below 30 s.

摘要

表面接枝改性被提出以改善聚丙稀腈中空纤维支撑聚二甲基硅氧烷（PDMS）膜的表面极性。含有一个胺基的引发剂 3-氨丙基三乙氧基硅烷被整合到 PDMS 中，并且具有强极性的聚乙烯吡咯烷酮（PVP）通过与胺基反应连接到表面。表面接枝改性通过 X 射线光电子能谱证明。PDMS 膜的水接触角急剧下降（从 ∼98°到 ∼28°）表明改性后表面极性显著提高。PDMS 膜的表面粗糙度随改性而增加，改性后 PDMS 表面几乎被 PVP 覆盖。PDMS 膜在 PVP 溶液中浸泡 10s 可提高 CO/H、CO/CH 和 CO/N 的选择性。虽然 CO 渗透度从 ∼2500 GPU 略有下降到 ∼2440 GPU。对于 CO/CH 和 CO/N 混合气体的分离，改性后所有 CO/CH 和 CO/N 的选择性均提高。对于 CO/H 混合气体的分离，当浸泡时间低于 30 s 时，CO/H 选择性提高。