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高透量聚二甲基硅氧烷/聚砜复合富氧膜制备

作者：陈凯迪，赵红永，谭小耀

单位：分离膜与膜过程省部共建国家重点实验室，天津工业大学环境与化学工程学院，天津300387

关键词：富氧；复合膜；PDMS；聚砜；预交联

DOI号：

分类号： TQ028.8

出版年,卷(期):页码： 2016,36(3):86-92

摘要：

采用湿涂法制备聚二甲基硅氧烷（PDMS）/聚砜（PSf）复合膜并测试其氧/氮分离性能，系统考察了硅橡胶浓度、预交联时间等因素对复合膜渗透分离性能的影响，探讨了涂膜液粘度及PDMS分子量与复合膜的成膜及渗透性能的关系。结果表明，提高PDMS浓度、对涂膜液进行预交联等可提高低粘度涂膜液在低涂覆速度下的成膜性能；为制备完整的分离皮层，涂膜液的粘度应大于1.75 mPa•s，PDMS粘均分子量大于85000，在此临界条件下制得的PDMS/PSf复合膜，在0.2MPa、常温条件下测得纯氧气透量为2197 GPU，氧/氮分离系数为2.05，原料气为空气时氧气透量为1543 GPU，氧/氮分离系数为1.70。

Poly(dimethylsiloxane)/polysulfone(PSf) composite membranes for oxygen/nitrogen separation were fabricated by the wet-coating method. The effects of PDMS concentration in the coating solution, and the pre-crosslinking time on the resultant PDMS/PSf membrane performance were systematically investigated. The relationships between the membrane formation and its permeability, and the coating solution viscosity as well as the PDMS molecular weight were further explored. The experimental results indicate that the membrane formability of the coating solution with low viscosity at low coating rate can be improved by increasing the PDMS concentration and performing a pre-crosslinking operation. In order to form compact selectivity layers, the viscosity of the coating solution should be higher than 1.75 mPa•s and the viscosity-average molecular weight of PDMS be larger than 85000. The oxygen permeance of the resultant PDMS/PSf composite membrane fabricated under the optimal critical conditions reached as high as 2197 GPU（pure gas）with the O2/N2 separation factor of 2.05 and 1543 GPU (air gas) with the O2/N2 separation factor of 1.70 which is much higher than the reported values in literatures.

基金项目：

教育部高等学校博士学科点专项科研基金(20131201110007) ; 天津市应用基础与前沿技术研究计划青年项目（14JCQNJC06400）

作者简介：

第一作者简介：陈凯迪(1992-)，男，山东东营人，硕士，从事气体膜分离研究。*通讯作者，E-mail: tanxiaoyao@tjpu.edu.cn；

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