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首页> 外文学位 >Formation, characterization, and performance testing of poly(phenylene oxide) and modified poly(phenylene oxide) membranes for gas separation.
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Formation, characterization, and performance testing of poly(phenylene oxide) and modified poly(phenylene oxide) membranes for gas separation.

机译：用于气体分离的聚苯醚和改性聚苯醚膜的形成，表征和性能测试。

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This work was focused on gas separation membranes made from high molecular weight poly (2,6-dimethyl-1,4-phenyl oxide) (PPO) and its chemically modified derivatives. The molecular weight of the polymer was calculated to be 316400 g/mol corresponding to 1.57 dL/g intrinsic viscosity in chloroform. The research objectives are to (i) study the effect of chemical modification of PPO on the gas separation performance of membranes made from the resulting polymers; (ii) study and compare the formation of dense and composite membranes based on PPO, and correlate the formation of these membranes to their performance and morphology; (iii) put forward a model to predict and evaluate the performance of composite membranes based on the intrinsic properties of the individual polymeric layers forming the composite membrane. The objectives of the research covered the following topics of membrane science: (i) material development and modification, (ii) membrane-gas penetrant interaction, (iii) membrane morphology and formation, and (iv) mathematical modeling of transport phenomena in porous and thin film composite membranes. The gas separation performance of the membranes was tested based on the permeation of CO2, CH4, O2, and N2 gases. The membrane selectivity was mainly judged by CO2/CH4 and O2/N2 permeability ratios. These gases are of relevant industrial and/or environmental interest.; The chemical modification of PPO was carried out via sulfonation, bromination, and simultaneous sulfonation and bromination. The gas permeability in 20% and 37.4% brominated PPO membranes increased slightly, while it increased significantly in 60% brominated PPO, in comparison to that of the parent polymer. The permeability ratio of PPO was maintained in the resulting brominated PPO. Infrared study showed that bromination resulted in stiffening the torsional motion of the phenyl ring around the ether link, and at moderate and high bromination levels, the interference of the bromine group with neighboring methyl groups became significant. This conformed to the postulation that high bromination level is needed to produce significant increase in the length of a diffusional jump segment, hence the diffusional jumps rate.; The effect of sulfonation of PPO, and the effect of replacing the proton of the sulfonic groups with: mono-valent, di-valent, and tri-valent metal cations, was investigated. (Abstract shortened by UMI.)
机译：这项工作的重点是由高分子量聚（2,6-二甲基-1,4-苯氧基）（PPO）及其化学改性衍生物制成的气体分离膜。计算出该聚合物的分子量为316400g / mol，相当于在氯仿中的特性粘度为1.57dL / g。研究目的是（i）研究PPO的化学改性对由所得聚合物制成的膜的气体分离性能的影响; （ii）研究并比较基于PPO的致密和复合膜的形成，并将这些膜的形成与其性能和形态相关联; （iii）根据构成复合膜的各个聚合物层的固有特性，提出一种模型来预测和评估复合膜的性能。该研究的目标涵盖了膜科学的以下主题：（i）材料开发和改性，（ii）膜-气体渗透剂相互作用，（iii）膜的形态和形成，（iv）多孔和多孔膜中传输现象的数学模型薄膜复合膜。基于CO 2 ，CH 4 ，O 2 和N 2的渗透率测试膜的气体分离性能气体。膜的选择性主要由CO 2 / CH 4 和O 2 / N 2 的渗透率来判断。这些气体具有相关的工业和/或环境利益。 PPO的化学修饰是通过磺化，溴化以及同时进行磺化和溴化进行的。与母体聚合物相比，在20％和37.4％溴化PPO膜中的气体渗透率略有增加，而在60％溴化PPO中则显着增加。在所得溴化PPO中维持PPO的渗透率。红外研究表明，溴化作用会导致苯环在醚键周围的扭转运动加剧，在中等和较高的溴化水平下，溴基团对邻近甲基的干扰变得明显。这符合以下假设：需要高溴化水平才能显着增加扩散跳跃段的长度，因此需要增加扩散跳跃率。研究了PPO磺化的效果，以及用单价，二价和三价金属阳离子取代磺酸基质子的效果。 （摘要由UMI缩短。）

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