聚丙烯腈基不对称膜相转化过程中孔结构形成研究
作者:金鑫,李琳,王春雷,徐瑞松,刘峤,潘艳秋,李魁然,王同华
单位: (1大连理工大学 化工学院 精细化工国家重点实验室 膜科学与技术研究开发中心,大连 116024 2台湾中原大学 薄膜研究发展中心 台湾 32023)
关键词: 聚丙烯腈;不对称膜;相转化;孔结构形成
出版年,卷(期):页码: 2017,37(2):46-52

摘要:
 采用L-S相转化法制备聚丙烯腈不对称膜,使用光学显微镜测试非溶剂在铸膜液中的扩散速率,结合光穿透实验、扫描电子显微镜及气体渗透性能测试结果,研究相转化过程中溶剂种类、铸膜液浓度及蒸发时间对成膜过程中孔结构形成过程的影响。结果表明:成膜工艺对相转化过程中的孔结构的形成有明显影响。不同溶剂制备的铸膜液其黏度及溶剂与非溶剂溶解度参数差不同,影响非溶剂在铸膜液中扩散系数。增加铸膜液浓度,其黏度增加;延长蒸发时间,膜的致密层厚度增加,二者都使非溶剂在铸膜液中的扩散系数下降,从而影响相转化过程中孔结构的形成。
 The asymmetric membranes were prepared by L-S phase inversion method. Optical microscopy was adopted to investigate the diffusion rate of non-solvent in casting solution. Light transmittance experiment, scanning electron microscopy and gas permeation test were used to investigate the effects of solvent type of the casting solution, casting solution concentration and evaporation time on the asymmetric membrane formation process. Results show that the pore structure of membrane formation process was affected significantly by technological conditions. Type of solvent affected the viscosity and intermiscibility of solvent and non-solvent, which caused the different diffusivity of non-solvent in casting solution and affected the pore structure formation during phase inversion process. Increasing the casting solution concentration caused the rise of viscosity and extension of evaporation time increased the dense membrane thickness which both decreased the diffusivity of non-solvent in casting solution and affected the pore structure formation during phase inversion process.
第一作者简介:金 鑫(1989-),女,辽宁大连人,博士生,从事炭膜材料的研究 E-mail:jinxin925@126.com

参考文献:
 [1] 孙本惠. 热力学及动力学因素对L-S相转化法制备非对称膜结构与性能的影响.[J].膜科学与技术,2011,31(1):1-11。
[2] 陆茵. 关于湿法想转换成膜机理的探讨.[J]. 膜科学与技术,1999,19(5):38-43。
[3] 丑树人,任吉中,李晖,等. 高性能聚醚酰亚胺中空纤维气体分离膜的制备与分离性能.[J]. 膜科学与技术,2010,30(3):21-26。
[4] 吕晓龙,武春瑞,张昊,等. NIPS法聚偏氟乙烯超滤膜的制备与应用.[J].中国工程科学,2014,16(12):35-45。
[5] 曾华丽,相波,李义久. 微滤膜材料分析研究.[J]. 上海化工,2011,36(2):15-19。
[6] Kim I,Yun H,Lee K,Preparation of asymmetric polyacrylonitrile membrane with small pore size by phase inversion and post-treatment process.[J]. Journal of Membrane Science,2002,199(1):75-84。
[7] 方超平,苏仪,万印华. 聚丙烯腈超滤膜的制备.[J]. 化学工程,2011,39(7):65-68。
[8] 刘远,赵晓燕,贾炎,等. 醋酸纤维素平板膜孔结构调控及过滤性能表征.[J].高分子材料科学与工程,2016,32(5):81-86。
[9] Li JF,Xu ZL,Yang H,et.al. Hydrophilic Microporous PES Membranes Prepared by PES/PEG/DMAc Casting Solutions.[J]. Journal of applied polymer science,2008,107(6):4100-4108。
[10] Li JF,Xu ZL,Yang H. Microporous polyethersulfone membranes prepared under the combined precipitation conditions with non-solvent additives.[J]. Polymers for Advanced Technologies,2008,19(4):251-257。
[11] Lua AC,Shen Y. Preparation and characterization of asymmetric membranes based on nonsolvent/NMP/P84 for gas separation.[J]. Journal of Membrane Science. 2013,429(4):155-167。
[12] 何曼君,张红东,陈维孝,等. 高分子物理(第三版)[M].上海:复旦大学出版社,2007,52-54。

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