膜科学与技术

Pebax/SAPO-34混合基质膜的制备及性能研究

作者：赵丹¹，²，任吉中¹，?，李晖¹，张立秋¹，²，李新学¹，邓麦村¹

单位： 1. 洁净能源国家实验室, 大连化学物理研究所，大连 116023；2. 中国科学院大学，北京 100049

关键词： :Pebax; 混合基质膜; 溶剂

出版年,卷(期):页码： 2014,34(5):9-15

摘要：

选用Pebax1657和SAPO-34为膜材料,分别采用醋酸和1-丁醇为溶剂,通过流延法制备Pebax/SAPO-34混合基质膜(MMMs).研究发现溶剂能显著地影响膜的结构形态以及渗透性能.纯Pebax膜的气体渗透系数受溶剂的影响较大,而选择性受溶剂影响不大.对于分子筛含量较高（33wt%）的MMMs,以1-丁醇为溶剂时,分子筛的分散均匀程度更高,但就材料的成膜性而言,醋酸为溶剂时更好.MMMs中气体渗透系数的变化是结晶度、扩散曲度、链段运动能力和膜形态等因素的共同作用的结果.醋酸为溶剂时,由于相分离的发生,气体的渗透系数出现突跃,最大提高到纯Pebax膜的3倍.1-丁醇为溶剂时,除H2外,气体渗透系数先出现一定程度的提高,而后由于受到链段僵化以及扩散曲度的影响而降低.

Poly (amide-6-b-ethylene oxide) (Pebax1657) and SAPO-34 were used to prepare Pebax1657/SAP-O34 mixed matrix membranes (MMMs) by solution-casting method with 1-butanol and acetic acid as solvent respectively. It was found that the casting solvent had more influence on permeability rather than selectivity. The MMMs prepared with 1-butanol had better zeolite distribution at high zeolite content, but the better membrane-forming was belonged to that prepared with acetic acid. The change of permeability was the co-effect of crystallization, diffusivity tortuosity, mobility of polymer chain and membrane morphology. When acetic acid was used, due to the phase separation, the permeability showed a jump and maximum reached 3 fold of the pristine Pebax membrane, and when 1-butanol was used, except for H2, the permeabilities of other gases increased initially and then decreased as a result of chain rigidification and increased diffusivity tortuosity.

赵丹（1987-），女，河南新乡人，博士，从事膜分离技术的研究。

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