含氟聚酰亚胺的研究及其在涂料中的应用

介绍了含氟聚酰亚胺的分类和研究动向,重点介绍了含三氟甲基及六氟丙基的聚酰亚胺的特点和性能。阐述了含氟聚酰亚胺在绝缘涂料中的应用,并对含氟聚酰亚胺在光电材料、复合材料和气体分离膜等领域中的应用进行了概述。     

酸性气体分离膜的研究现状及进展

当前,气体分离膜是一种环保绿色的分离技术,本文概括了目前用于去除CO2的商业膜材料(醋酸纤维素、聚酰亚胺和含氟聚合物),对不同膜的物理化学性质,气体渗透特性等进行了介绍。     

含氟聚酰亚胺的研究进展

含氟聚酰亚胺是一类重要的高性能聚合物材料,因其突出的物理化学性质、光学和电学性能以及气体选择透过性等被广泛应用于电子工业、光波通讯、航空航天以及气体分离材料等领域。文章着重介绍了含氟聚酰亚胺的研究进展,同时简述含氟聚酰亚胺结构性能及应用。     

无定型含氟聚合物的制备及其在气体分离膜领域的研究进展

与其他含氟聚合物材料相比,无定型含氟聚合物除了具有优异的机械强度、热和化学稳定性,还具有易溶于含氟溶剂、较好的耐溶胀和耐塑性、高的自由体积、独特的气体渗透和吸附性能,使其发展成为良好的气体分离膜材料。综述了无定型含氟聚合物的种类和基本特性,重点介绍了无定型含氟聚合物的制备研究进展及其在气体分离膜领域的应用研究;展望了无定型含氟聚合物的制备研究和发展方向,并探讨了其在气体分离膜领域的发展前景。     

一种新型的膜材料—聚酰亚胺

介绍了新型膜材料聚酰亚胺的发展历史及其特性；从３个方面阐述了其作为分离膜的研究进展。从聚酰亚胺膜耐高温、耐腐蚀及选择性好的特点出发，对其在气体分离和渗透蒸发应用前景作了展望。     

含氟聚酰亚胺的设计、合成及应用性能研究进展

聚酰亚胺作为结构独特的一类功能性高分子材料,应用广泛。随着人们对材料综合性能要求的提高,含氟聚酰亚胺颇受业界关注。聚酰亚胺结构中引入氟原子既能提高材料溶解性和透光率,还能降低其吸湿率和介电常数。综述了近年来含氟聚酰亚胺在设计、合成和应用性能方面的研究进展,指出其结构设计带来的性能优势。特别是对含氟聚酰亚胺的溶解性、光学性能、热性能等进行了总结。展望了其在柔性显示面板/基板市场的应用发展方向。     

含氟聚酰亚胺的设计、合成及应用性能研究进展

聚酰亚胺作为结构独特的一类功能性高分子材料,应用广泛.随着人们对材料综合性能要求的提高,含氟聚酰亚胺颇受业界关注.聚酰亚胺结构中引入氟原子既能提高材料溶解性和透光率,还能降低其吸湿率和介电常数.综述了近年来含氟聚酰亚胺在设计、合成和应用性能方面的研究进展,指出其结构设计带来的性能优势.特别是对含氟聚酰亚胺的溶解性、光学性能、热性能等进行了总结.展望了其在柔性显示面板/基板市场的应用发展方向.     

金属有机框架/聚酰亚胺混合基质膜的研究进展

聚酰亚胺是一种具有高热稳定性和良好成膜性的高分子材料,但聚酰亚胺膜在气体分离方面的应用效果较差。金属有机框架材料在气体分离中有较好的应用前景。用两者制备的混合基质膜,可以综合其各自的优点,提高对气体的选择渗透性。本文综述了采用金属有机框架材料、金属有机框架材料改性以及添加其他聚合物基底制备混合基质膜,对气体分离效果的影响,并对这种混合基质膜在气体分离领域的使用效果进行了分析,对这种混合基质膜面临的挑战进行了讨论与展望。     

生产含氟聚酰亚胺膜的方法和设备

提供一种生产具有突出的耐热性、耐化学药品性、防水性、绝缘性、电性能和光学性能的含氟聚酰亚胺膜的方法和适用于该方法的旋转涂布机。提供一种生产聚酰亚胺膜的方法,该方法包括在将相对湿度调至不大于50RH％的气氛中使含氟聚酰亚胺前体形成涂布膜,然后对该含氟聚酰亚胺前体进行热处理从而形成含氟聚酰亚胺膜。按照该方法,     

低介电常数聚酰亚胺的研究进展

现代微电子工业要求层间绝缘材料具有较低的介电常数。该文介绍了几种降低聚酰亚胺介电常数的方法,包括含氟聚酰亚胺、聚酰亚胺无机杂化复合材料和聚酰亚胺多孔材料,其中最为有效的措施是将含氟取代基引入到聚酰亚胺分子结构中。     

聚吡咙膜的气体透过性能及应用

论述新型芳族含氮杂环聚吡咙膜的气体透过性能和应用，并与聚酰亚胺(PI)膜的气体分离性能进行比较。揭示出聚吡咙膜的扩散系数与气体分子有效直径之间及溶解系数和临界温度之间呈直线关系，指出气体在聚吡咙膜中的透过主要受扩散因素控制。与类似结构的PI膜相比，聚吡咙膜具有更优异的氧氮分离性能、CO2/CH4分离性能和氢氮分离性能，其透过系数和选择分离系数均高于PI膜，是一类很有发展潜力的聚合物膜材料。     

聚酰亚胺膜气体渗透性的改性进展

聚酰亚胺分离膜(PI)是由芳香二酐和二胺单体缩聚而成的,它是主链含有酰亚胺环的一类高聚物。因其具有良好的气体分离性能、热稳定性、耐溶剂性等特性而受到人们的广泛关注。但是,其气体渗透-选择性的平衡问题限制了其在气体分离领域的广泛应用。因此,研究者们将目光转向了聚酰亚胺膜气体渗透性的改性方面,使其具有良好的气体渗透性,用于混合气体的高效分离。文章综述了近年来研究者对聚酰亚胺气体渗透性的研究进展,详细介绍了共混改性、交联改性和分子结构改性方面的最新研究成果,并总结展望了聚酰亚胺膜今后的研究趋势。为未来高效分离膜的研发提供了参考。     

CO2/CH4高分子气体分离膜材料研究进展

气体膜分离法正在成为分离CO2/CH4体系的一项重要技术。概括介绍了该领域国内外的主要高分子膜材料的研究进展,重点介绍了聚酰亚胺膜和促进传递膜材料,并提出了膜材料的改进方向,以期为制得更好的膜提供帮助。     

Progress in Applications of Polymer-Based Membranes in Gas Separation Technology

Separation of gases through polymeric membrane by selective transport has immense advantages such as light weight, economical, high process flexibility, and space requirements. Fabrication methods of polymeric membrane (polysulfone, polyimide, polyamide, polycarbonate) and their properties along with fundamental principles for gas separation mechanism are discussed in this review. Polysulfone membranes are fabricated by dry/wet phase inversion process to investigate membrane properties. Polyimide membranes show great potential for gas separation and reveal good selectivity for CO₂/N₂ and CO₂/CH₄ gas pairs. Transport characteristics of polycarbonate membrane are improved by functionalization. Superior properties allow potential use of polymeric membranes in large-scale industrial applications.     

Membrane Concentration and Separation of L-Aspartic Acid and L-Phenylalanine Derivatives in Organic Solvents

Abstract

The concentration and separation of the amino acids N-benzyloxycarbonyl L-aspartic acid and L-phenylalanine methyl ester hydrochloride in organic solvents have been investigated using reverse osmosis membranes of two types of cellulose acetate, a nanofiltration membrane of polyamide-polyphenylene sulfone (PA-PPSO) composite and a gas separation membrane of polyimide composite in a stirred batch cell. The organic solvents used included primary, secondary, and tertiary alcohols, an ester, and a ketone. There were significant variations in permeate flux, solute rejection, and membrane stability. Usually the rejection of both amino acids was similar; however, certain membrane-solvent combinations gave significantly different levels of rejection. The highest rejection of amino acids (～0.94) at the lowest pressure of 0.5 MPa was obtained with the PA-PPSO membrane using methanol as a solvent. The cellulose acetate membranes gave reasonable rejection and fluxes but the membrane stability was very poor. The performance of the polyimide composite membrane was good with ethanol but poor with other solvents. The PA-PPSO membrane with methanol as solvent appeared the most promising combination, and the separation performance according to concentration polarization was discussed.

     

酸性侵蚀性气体分离膜材料研究及应用进展

综述了CO2、H2S、SO2、Cl2及HCl等酸性侵蚀性气体分离膜材料的最新研究与应用进展,讨论了这类气体膜分离工艺对膜材料的要求,介绍了聚酰亚胺(PI)、聚二甲基硅氧烷(PDMS)、聚四氟乙烯(PTFE)、碳分子筛(CMS)等几种耐蚀分离膜材料的特征结构、特点、适用的气体分离类型及相应的分离机理。     

Separation of Hydrogen from Carbon Monoxide Using a Hollow Fiber Polyimide Membrane: Experimental and Simulation

The separation of hydrogen from carbon monoxide (syngas ratio adjustment) with polymeric membranes was investigated in this work. A polyimide hollow fiber membrane module was used for hydrogen separation. This polymer has shown large permeability and selectivity for hydrogen separation (selectivity of ca. 30). Permeation tests were carried out at different feed conditions. Feed flow rates were varied between 150–300 mL/min, temperature was varied in the range of 20–80 °C and feed pressure was varied between 5–9 bar. Mixtures containing 0–50 % carbon monoxide were used when carrying out experiments. Measured membrane permeances for hydrogen and carbon monoxide were about 70–100 GPU (gas permeation units) and 3–5.5 GPU, respectively. In addition, a mathematical model for simulation of gas separation in hollow fiber membrane modules with all flow patterns (crossflow, countercurrent and cocurrent) was presented. This model can be used for calculation of membrane performance or its required surface area for a specific separation. Experimental results have shown good correlation with simulation results. Plasticization, competitive sorption and concentration polarization effect of carbon monoxide on membrane performance is shown with experimental results. This effect reduced hydrogen permeances in mixed gas experiments.