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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.

本课题旨在在多孔膜上制备聚酰胺Langmuir-Blodgett薄膜，并研究其气体渗透行为。这是Langmuir-Blodgett薄膜的新应用。该项目的问题之一是该工艺需要对乙酸酐和吡啶进行处理，其中多孔基聚合物（底物）应具有对该溶剂体系的抗性。聚丙烯制成的“Juragard 240”基膜适合于此用途。在此基础上成功制备了聚酰胺Langmuir-Blodgett薄膜，并应用于气体渗透检测。随着层数的增加，渗透数减小。因此，虽然渗透数受层数的影响，但随着层数的增加，氮和氧的渗透比变化不显著。这意味着胶片有少量的缺陷。因此，我们采用电化学方法研究了聚酰亚胺Langmuir-Blodgett薄膜的缺陷。结果表明，与普通脂肪酸Langmuir-Blodgett薄膜相比，聚酰亚胺Langmuir-Blodgett薄膜的缺陷量要少得多。此外，聚酰亚胺的化学结构改变了聚酰胺Langmtiir-Blodgett薄膜的缺陷数量，其中一些聚酰亚胺提供了几乎没有缺陷的Langmuir-Blodgett薄膜。未解决的问题，氮和氧的比例，应该是未来这类薄膜的问题。