Enhancing gas permeation and separation performance of polymeric membrane by incorporating hollow polyamide nanoparticles with dense shell
Enhancing gas permeation and separation performance of polymeric membrane by incorporating hollow polyamide nanoparticles with dense shell
复制标题
通过掺入具有致密壳的空心聚酰胺纳米粒子来增强聚合物膜的气体渗透和分离性能
DOI：
10.1016/j.memsci.2018.10.033
复制
发表时间：
2019-01-15
影响因子：
9.5
通讯作者：
Zhang, Yuzhong
中科院分区：
文献类型：
--
作者：
Ding, Xiaoli;Tan, Fangfang;Zhang, Yuzhong
许多无机纳米填料，包括多孔纳米粒子和无孔纳米粒子，被引入到聚合物基体中，以超过聚合物膜材料的气体渗透性和选择渗透性之间的权衡关系。然而，有机-无机组合经常遭受有机基质和无机填料之间的不期望的界面。在本研究中，我们在无表面活性剂的微乳液中通过界面聚合制备了具有致密壳层的中空聚酰胺纳米粒子。然后通过紫外光引发聚合反应，将空心纳米粒子与液态丙烯酸酯单体复合形成混合基质膜。平均粒径为42 nm的纳米粒子均匀分散在膜中。所得膜没有显示出明显的缺陷。与纯聚合物膜相比，随着纳米填料含量的增加，MMM的CO2渗透性和CO2/N2-选择渗透性均增加。并且气体渗透和分离性能超过Robeson上限线，在1wt%纳米填料负载下，最大CO2渗透率为1898 Barrer，最大CO2/N-2选择渗透率为43.9。这种改善主要来自于CO2溶解度、N2-扩散系数和CO2/N2-溶解度选择性的提高。这种具有致密壳层的中空聚合物纳米颗粒和聚合物膜的组合也有希望用于制备用于气体分离的超薄且无缺陷的膜。
Many inorganic nanofillers including porous nanoparticles and nonporous nanoparticles, are incorporated into the polymer matrices to exceed the trade-off relationship between the gas permeability and the permselectivity of the polymeric membrane materials. However, the organic-inorganic combination often suffers from the undesirable interface between the organic matrices and the inorganic fillers. In this study, we fabricated the hollow polyamide nanoparticles with dense shell via the interfacial polymerization in the surfactant-free microemulsion. And then the hollow nanoparticles combined with liquid acrylate monomers to form the mixed matrix membranes (MMMs) via the UV-induced photo-polymerization. The nanoparticles with an average diameter of 42 nm dispersed uniformly in the membranes. The resulting membranes showed no obvious defect. Compared with those of the pure polymer membrane, the CO(2 )permeability and CO2/N-2 permselectivity of the MMMs both increased as the nanofiller loading increased. And the gas permeation and separation performance exceeded the Robeson upper bound line with a maximum CO2 permeability of 1898 Barrer and a maximum CO2/N-2 permselectivity of 43.9 at 1 wt% nanofiller loading. The improvement mainly arose from the increase in the CO2 solubility, the N-2 diffusivity and the CO2/N-2 solubility selectivity. This combination of the hollow polymer nanoparticle with the dense shell and the polymeric membrane is also promising for fabricating ultra-thin and defect-free membranes for gas separation.