为改善聚二甲基硅氧烷(PDMS)渗透汽化膜的力学性能,选用聚酰胺6(PA6)为基膜材料,乙烯-乙烯醇共聚物(EVOH)为致孔剂,通过熔融纺丝法制备PA6/EVOH中空纤维,并萃取除去EVOH得到PA6中空纤维膜。研究了EVOH含量对膜性能的影响,并在膜表面接枝聚二甲基硅氧烷(PDMS)测试PDMS接枝膜的渗透汽化性能。结果表明,PA6中空纤维膜的水通量随着EVOH含量的增加而增加,在0.05MPa压力下,水通量最大能可达到966.8L/(m2·h),对碳素墨水(300nm)的截留率最大可达到80.2%,拉伸强度最大能达到12.4MPa。接枝PDMS的PA6中空纤维膜对乙醇溶液渗透通量为789.4g/(m2·h),分离因子为8.15,为后续膜表面改性提供了思路。
In order to improve the mechanical properties of polydimethylsiloxane (PDMS) pervaporation membranes,PA6/EVOH hollow fiber was prepared by melt spinning with polyamide 6 (PA6) as the base membrane material and ethylene vinyl alcohol copolymer (EVOH) as the pore forming agent,and then the PA6 hollow fiber membrane was obtained by extracting and removing the EVOH.The influence of EVOH content on the membrane performance was studied.Polydimethylsiloxane (PDMS) was grafted onto the membrane surface,and the pervaporation performance of the PDMS-grafted membrane was tested.The results showed that the water flux of PA6 hollow fiber membrane increased with the increase of EVOH content.Under a pressure of 0.05MPa,the maximum water flux could reach 966.8L/(m2·h),the maximum retention rate for carbon ink (300nm) could reach 80.2%,and the maximum tensile strength could reach 12.4MPa.The permeation flux of PDMS-grafted PA6 membrane for ethanol solution was 789.4g/(m2·h),and the separation factor was 8.15,which provided ideas for the subsequent membrane surface modification.
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基金资助
中央高校基本科研业务费专项资金资助(106-06-0019016)
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