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Morphology and gas permselectivity of polymer mixture system

聚合物混合物体系的形貌和气体选择性渗透性

基本信息

批准号：
06045018
负责人：
TSUJITA Yoshiharu
金额：
$ 2.62万
依托单位：
Nagoya Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06045018/
关键词：
polymer blend polystirene polycarbonate blend system poly (methyl methacrylate)poly (stirene-co-acrylonitrile) blend system polyimide polyimide blend system miscibility gas transport properties additivity rule solid-state NMR ポリメタクリ

项目摘要

In this study, to obtain the relationships between the morphologies and gas transport properties of the polymer mixture systems, the following three types of the polymer blend systems were investigated.1. polystirene/polycarbonate (PS/PC) blend systemFrom the results of DSC,WAXD,and solid-state NMR for the PS/PC blend system membranes which were prepared by solution-casting, it was confirmed that the polymer blend system is immiscible and PC component is partially crystallized. The fact that CO_2 sorption amount for the polymer blend was larger than that expected from simple additivity rule was mainly explained by the amount of the crystallite of PC.2. poly (methyl methacrylate)/poly (stirene-co-acrylonitlile) (PMMA/SAN) blend systemPMMA was found to be miscible with SAN,having an AN content from 17.9 to 39.5mol% at a level of less than 30-70*, from the ^1H spin-diffusion behavior. The CO_2 permeability and diffusion coefficients of the blend membranes were larger than those expected from the additivity rule, although the solubility coefficients follow this rule. From the dielectric relaxation spectra of PMMA/SAN blend system, it was concluded that the local mobility of PMMA was activated by blending with SAN,resulting the gas diffusion and permeability promoted some extens. Moreover, it was suggested that the distance between AN is related for the miscibility of the PMMA/SAN blend system.3. polyimide/polyimide (PI/PI) blend systemRod-like PI/flexible PI blend membranes were obtained by mixing the corresponding precursors at the various stirring temperatures. From the results of DMS and TEM,it was found that the blend systems become completely miscible when the stirring temperatures is high. The permeability coefficient of PI/PI blend membrane was higher than that expected from the additivity rule. In conclusion, the blending rod-like PI and flexible PI promotes the gas transport properties some extents.

在本研究中，为了获得聚合物共混体系的形态与气体输运性质之间的关系，研究了以下三种类型的聚合物共混体系。通过DSC、WAXD和固态核磁共振对溶液浇铸法制备的PS/PC共混体系膜进行分析，证实了聚合物共混体系是不混相的，PC组分部分结晶。聚合物共混物对CO_2的吸附量大于简单加性规律，主要原因是pc2的结晶量。聚甲基丙烯酸甲酯/聚苯乙烯-共丙烯腈（PMMA/SAN）共混体系与SAN可相混，an的含量在17.9 ~ 39.5mol%之间，且浓度小于30 ~ 70*。共混膜的CO_2渗透系数和扩散系数均大于可加性规律，但溶解度系数符合可加性规律。从PMMA/SAN共混体系的介电弛豫谱可知，与SAN共混可激活PMMA的局部迁移率，从而在一定程度上促进了气体的扩散和渗透率。此外，还表明AN之间的距离与PMMA/SAN共混体系的混相性有关。聚酰亚胺/聚酰亚胺（PI/PI）共混体系通过在不同搅拌温度下混合相应的前驱体，得到了棒状PI/柔性PI共混膜。DMS和TEM结果表明，搅拌温度较高时，共混体系完全混相。PI/PI共混膜的渗透系数高于可加性规律。综上所述，棒状PI和柔性PI的混合在一定程度上提高了气体输运性能。