PDMS/聚酰亚胺中空纳米微球/PEI混合基质复合膜的制备及气体分离性能研究
作者:曹倩倩,唐永富,蔡钦兴,丁晓莉,赵红永,张玉忠
单位: 天津工业大学,省部共建分离膜与膜过程国家重点实验室,天津300387
关键词: 混合基质;复合膜;聚二甲基硅氧烷;氧氮分离
分类号: TQ028.1
出版年,卷(期):页码: 2021,41(4):42-48

摘要:
 以均苯四甲酰氯(BTAC)和4,4-(9-亚芴基)-二胺(FDA)为油相和水相单体,在微乳液体系中通过界面聚合法制备了聚酰亚胺中空纳米微球。然后配制微球和聚二甲基硅氧烷的正己烷混合液作为涂层液,采用浸渍涂覆法制备聚二甲基硅氧烷/聚酰亚胺中空纳米微球/聚醚酰亚胺复合膜,并对氧气、氮气的渗透速率和氧/氮分离性能进行了测试。系统考察了聚合物浓度、预交联时间、浸渍时间、提拉速度及固化温度对复合膜气体渗透性能的影响。结果表明:当硅橡胶浓度为 3 wt.%、预交联时间为3 h、浸渍时间为120 s、提拉速度为 0.5 m/min、固化温度为80 °C时,制备的复合膜性能较佳。测试条件为0.2 MPa,25 °C时,具有无缺陷皮层复合膜的O2的渗透速率高达1676 GPU,O2/N2的分离因子为2.2。
  Using 4,4-(9-fluorenylidene)-diamine and 1,?2,?4,?5-?benzene tetracarbonyl chloride as aqueous phase and oil phase reaction monomers respectively, hollow polyimide nanospheres were prepared by interfacial polymerization in the microemulsion system. Then, the mixture of PDMS, hollow polyimide nanospheres, and hexane was used as the coating solution, to prepare PDMS/hollow polyimide nanospheres/polyetherimide composite membranes by dip-coating method. The pure-gas permeances of oxygen and nitrogen and the ideal seperation factor of O2/N2 were investigated. The effects of the polymer concentration, the pre-crosslinking time, the immersion time, the pulling speed, and the curing temperature on the performance of composite membranes were investigated systematically. The results showed that the composite membrane had optimal permeance when the polymer concentration was 3 wt%, the pre-crosslinking time was 3 h, the immersion time was 120 s, the pulling speed was 0.5 m/min, and the curing temperature was 80 °C. At 0.2 MPa and 25 °C, the optimal permeance of O2 was 1676 accompanied with an ideal O2/N2 separation factor of 2.2.

基金项目:
国家自然科学基金项目(21776217,21978214);天津市自然科学基金项目(18JCYBJC89400)

作者简介:
曹倩倩(1996-),女,陕西西安人,硕士,主要从事气体分离膜研究。E-mail:16622905872@163.com

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