High-flux Gas-separation Membranes Based on Ultrathin Hyperbranched Polymer Films Grafted onto Highly Porous Supports

基于接枝到高孔隙支撑物上的超薄超支化聚合物薄膜的高通量气体分离膜

• 批准号: 9816108
• 负责人: Merlin Bruening
• 金额: $ 32万
• 依托单位: Michigan State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-02-01 至 2003-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9816108&HistoricalAwards=false
• 关键词: flux; Gas; separation; Membranes; Based

Membrane-based separations are attractive because of their simplicity, low energy costs, and ability to operate in remote locations. Full utilization of the advantages of membrane technology, however, will require new membranes with increased permeabilities and selectivities. Unfortunately, flux through membranes is generally inversely related to selectivity. The development of ultrathin membranes will allow high flux, but synthesis of such structures with sufficient selectivity, strength, and quality is an ongoing challenge. This proposal addresses the challenge of developing and understanding selective and ultrathin ( 50 nm) gas-separation membranes through the use of hyperbranched poly acrylic acid (PAA) films grafted onto porous supports. PAA films will provide an ultrathin and selective layer while the highly permeable substrate is required for mechanical stability. Hyberbranced PAA films will be unique membrane materials because their branched structure will allow full coverage of substrate pores, their layer-by-layer synthesis will yield films whose thickness can be varied from 3-100 nm, and the high density of carboxylic acid groups in the film will permit a wide range of chemical modifications even after membrane formation

基于膜的分离是有吸引力的，因为它们简单、低能量成本和能够在远程位置操作。 然而，充分利用膜技术的优点将需要具有增加的渗透性和选择性的新膜。 不幸的是，通过膜的通量通常与选择性呈负相关。 发展的可渗透膜将允许高通量，但合成这样的结构具有足够的选择性，强度和质量是一个持续的挑战。 该提案解决了通过使用接枝到多孔支撑体上的超支化聚丙烯酸（PAA）膜来开发和理解选择性和非选择性（50 nm）气体分离膜的挑战。 PAA膜将提供一个可渗透的和选择性的层，而高渗透性的基底是机械稳定性所必需的。 超支化PAA膜将是独特的膜材料，因为它们的支化结构将允许基底孔的完全覆盖，它们的逐层合成将产生厚度可以从3-100 nm变化的膜，并且膜中的高密度羧酸基团将允许甚至在膜形成之后的宽范围的化学改性