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浙江大学学报(工学版)
浙江大学学报(工学版)  2019, Vol. 53 Issue (2): 228-233    DOI: 10.3785/j.issn.1008-973X.2019.02.004
能源工程     
PVP改性PDMS/PAN中空纤维复合膜提升表面亲水性
胡磊青(),程军*(),王亚丽,刘建忠,周俊虎,岑可法
浙江大学 能源清洁利用国家重点实验室，浙江 杭州 310027
Improvement on surface hydrophily of hollow fiber-supported PDMS gas separation membrane by PVP modification
Lei-qing HU(),Jun CHENG*(),Ya-li WANG,Jian-zhong LIU,Jun-hu ZHOU,Ke-fa CEN
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
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摘要：

为了改善气体分离复合膜中聚二甲基硅氧烷（PDMS）过渡层与极性分离层的界面结合，利用高极性的聚乙烯吡咯烷酮（PVP）修饰聚丙烯腈（PAN）中空纤维支撑的PDMS气体分离膜表面，以提高PDMS表面极性和亲水性并减少对气体渗透速率的不利影响. 利用X射线光电子能谱（XPS）证实利用溶液浸渍法可以将PVP接枝在PDMS表面对其修饰，并且随着浸渍时间的增加，PVP接枝量逐步增加，修饰效果逐渐增强. 实验结果表明，交联剂1,3,5-苯三甲酰氯（TMC）增强了PDMS表面的PVP接枝改性，PVP修饰使PDMS表面的水接触角降低到21.1°，显著提高了PDMS表面亲水性和极性，从而有利于PDMS层和极性分离层的紧密结合. PVP修饰使得CO2对其他气体（H2、CH4、N2）的选择性随TMC/PDMS摩尔比的增加而逐渐降低，气体选择性CO2/H2、CO2/CH4、CO2/N2的最大峰值分别为3.9、3.8、11.8.
关键词： 膜;  气体分离;  表面修饰;  渗透率;  极性    
Abstract:

Polyvinyl pyrrolidone (PVP) with high polarity was adopted to modify the surface of PDMS layer supported on polyacrylonitrile (PAN) hollow fiber, in order to improve the polarity and hydrophily of PDMS layer surface and ensure the minimum negative effect on gas permeability. The employment of PVP was to enhance the interfacial cohesion of polydimethylsiloxane (PDMS) gutter layer and polar selective layer in gas separation composite membrane. X-ray photoelectron spectroscopy (XPS) was utilized to prove that PVP could be grafted to PDMS layer and modify its surface by dip-coating, and the grafting quality and modification of PVP increased and enhanced respectively with the increase of coating time. Results showed that the crosslinker 1,3,5-Benzenetricarbonyl trichloride (TMC) could improve the function of PVP grafting modification, and the surfacewater contact angel decreased to 21.1°, which meant that the surface polarity and hydrophily of PDMS layer were obviously improved and the PDMS layer and polar selective layer were tightly combined. In addition, with the increase of molar ratio of TMC/PDMS, CO2/H2, CO2/CH4 and CO2/N2 selectivity decreased gradually by PVP modification, peaking at 3.9, 3.8 and 11.8, respectively.
Key words: membrane    gas separation    surface modification    permeability    polarity
收稿日期: 2018-01-25 出版日期: 2019-02-21
CLC:  X 511  
通讯作者: 程军     E-mail: leiqinghu@zju.edu.cn;juncheng@zju.edu.cn
作者简介: 胡磊青（1992—），男，博士生，从事CO2减排控制机理研究. orcid.org/0000-0001-8416-0789. E-mail： leiqinghu@zju.edu.cn
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胡磊青
程军
王亚丽
刘建忠
周俊虎
岑可法

引用本文:

胡磊青,程军,王亚丽,刘建忠,周俊虎,岑可法. PVP改性PDMS/PAN中空纤维复合膜提升表面亲水性[J]. 浙江大学学报(工学版), 2019, 53(2): 228-233.

Lei-qing HU,Jun CHENG,Ya-li WANG,Jian-zhong LIU,Jun-hu ZHOU,Ke-fa CEN. Improvement on surface hydrophily of hollow fiber-supported PDMS gas separation membrane by PVP modification. Journal of ZheJiang University (Engineering Science), 2019, 53(2): 228-233.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2019.02.004    或    http://www.zjujournals.com/eng/CN/Y2019/V53/I2/228

图 1  材料化学结构式与PAN中空纤维SEM图
MT/P PVP接枝改性 wB/%
Si N
2∶3 改性前 24.12 2.28
改性后 22.59 3.04
10∶3 改性前 22.64 2.22
改性后 16.32 4.58
18∶3 改性前 21.66 2.03
改性后 14.82 7.70
表 1  PVP接枝改性前后PDMS/PAN中空纤维复合膜表面特征元素质量分数变化
图 2  PVP接枝改性前后PDMS/PAN中空纤维复合膜的表面XPS图
图 3  不同TMC/PDMS摩尔比下PVP接枝改性前后PDMS/PAN中空纤维复合膜的表面水接触角
图 4  不同TMC/PDMS摩尔比下PVP接枝改性前后PDMS/PAN中空纤维复合膜的CO2渗透速率
图 5  不同TMC/PDMS摩尔比下PVP接枝改性前后PDMS/PAN中空纤维复合膜的CO2对其他气体的选择性
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