Application of Polyimide Langmuir-Blodgett Films to Selective Gas Permeation

聚酰亚胺 Langmuir-Blodgett 薄膜在选择性气体渗透中的应用

基本信息

批准号：
63850180
负责人：
KAKIMOTO Masa-aki
金额：
$ 4.42万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

项目摘要

This research project aims to prepare polyamide Langmuir-Blodgett films on porous films, and examine gas permeation behavior of the films. This is a new application of Langmuir-Blodgett films.One of the problems of this project is that the process requires treatment of acetic anhydride and pyridine, where the porous base polymer (substrate) should have resistance to this solvent system. "Juragard 240" made by polypropylene was suitable for this purpose as the base film. Polylmide Langmuir-Blodgett films were successfully prepared on this base film, which applied to gas permeation examination. It was found that increasing with the number of layers, permeation number decreased. Thus, although the permeation number was influenced by the number of layers, the permeation ratio of nitrogen and oxygen did not change remarkably with increasing the number of layers. This meant the film had a small amount of defects. So, we examined the defect in polyimide Langmuir-Blodgett films using electrochemical method. The result indicated that polyimide Langmuir-Blodgett films had much less amount of defects compared with usual fatty acid Langmuir-Blodgett films. Further more, the number of defects in polyamide Langmtiir-Blodgett films changed by charging the chemical structure of polyimides, where some polyimides offered almost defect free Langmuir-Blodgett films. Unsolved problem, the ratio of nitrogen and oxygen, should be the future problem in such thin films.

该研究项目旨在在多孔膜上准备多酰胺langmuir-blodgett膜，并检查膜的气渗透行为。这是Langmuir-Blodgett膜的新应用。该项目的问题之一是该过程需要处理乙酸酐和吡啶，在该过程中，多孔碱基聚合物（底物）应对该溶剂系统具有抗性。聚丙烯制造的“芝加达240”适合此目的作为基本膜。在这种基础膜上成功制作了多晶象langmuir-blodgett膜，该膜适用于气体渗透检查。发现随着层的数量增加，渗透数减少。因此，尽管渗透数受层数的影响，但随着层数的增加，氮和氧的渗透比不会发生明显变化。这意味着这部电影有少量的缺陷。因此，我们使用电化学方法检查了聚酰亚胺Langmuir-Blodgett膜中的缺陷。结果表明，与通常的脂肪酸langmuir-blodgett膜相比，聚酰亚胺langmuir-blodgett膜的缺陷量要少得多。此外，聚酰胺langmtiir-blodgett膜中缺陷的数量通过充电聚酰亚胺的化学结构而变化，其中一些聚酰亚胺几乎提供了无缺陷的langmuir-blodgett膜。未解决的问题，即氮和氧的比率，应该是这种薄膜中的未来问题。