Tailored Gas Separation Membranes Through Selective Charge-Transfer Complex Formation

摘要本项目将探索一种改进气体分离聚合物膜的新方法。与其合成新材料或新复合结构的膜，不如对目前使用的各种膜聚合物进行化学改性以形成电荷转移配合物，以作为增强其气体分离性能的一种手段。亲核位点的溴化改变了聚合物中的自由体积和自由体积分布，使分子的扩散率增加，选择性改变。将测量经过处理的聚砜薄膜的CO2和CH4的渗透率，并与未处理的材料进行比较。据估计，未来几年膜销售的增长率为12-15%。该市场的很大一部分是气体分离，以生产商业上重要的气体材料，包括从天然气中去除二氧化碳和分离纯氧。

CTS-9308258 Johns Hopkins University Timothy A. Barbari ABSTRACT A new approach to improve polymeric membranes for gas separation will be explored in this project. Rather than synthesizing membranes of new materials or new composite structures, chemical modification to form charge-transfer complexes in various membrane polymers in current use is to be evaluated as a means of augmenting their gas separation properties. Bromination of nucleophilic sites alters the free volume and free volume distribution in polymers so that molecular diffusivity increases and selectivity changes. Permeabilities of CO2 and CH4 through a treated polysulfone film will be measured and compared with the untreated material. Growth in membrane sales for the next few years has been estimated at 12-15%. A large portion of this market is in gas separations to produce commercially important gaseous materials including the removal of carbon dioxide from natural gas and the separation of pure oxygen.