基于二乙醇胺/PVA的选择性渗透膜制备及表征

Preparation and Characterization of Permselective Membranes Based on Diethanolamine/PVA

目的制备一种二乙醇胺/聚乙烯醇(PVA)涂覆于低密度聚乙烯的选择性渗透膜,并对其性能进行研究。方法以硅藻土为添加剂、低密度聚乙烯(LDPE)为基膜,以二乙醇胺为胺基载体的复合聚乙烯醇为涂层,通过将涂膜液涂覆在低密度聚乙烯膜上制备新型选择性渗透膜,并研究二乙醇胺载体选择性渗透膜的气体选择性透过性能、二乙醇胺载体对渗透膜结构与性能的影响。结果试验制备的基于二乙醇胺/PVA的选择性渗透膜的CO_2和O_2的渗透系数比值最高可达5.13。结论所制备薄膜提高了CO_2气体渗透率,CO_2和O_2的气体选择性系数。随着二乙醇胺载体含量的增加,复合膜拉伸强度变化不显著,断裂伸长率随着胺基载体含量的增大略有上升。

The work aims to prepare a low density polyethylene permselective membrane applied with diethanolamine/polyvinyl alcohol（PVA） and study its properties. With diatomaceous earth as additive, low density polyethylene（LDPE） as basal membrane, and composite polyvinyl alcohol（taking diethanolamine as the amine carrier） as coating, a new permselective membrane was prepared with membrane solution applied on the LDPE memberane. The influences of the gas permselective performance of the permselective membrane of diethanolamine carrier and the diethanolamine carrier on the structure and performance of permeable membrane were studied. The maximum permeability coefficient ratio of CO_2 and O_2 of the permselective membrane prepared with diethanolamine/PVA in the test can reach up to 5.13. The membrane prepared has improved the penetration rate of CO_2 and the selectivity coefficients of CO_2 and O_2. With the increase of diethanolamine carrier content, the tensile strength of composite membrane does not change significantly, but the elongation at break first increases slightly with the increase of amine carrier content.