聚酰亚胺(PI) LB膜中长链单轴取向排列的AFM研究

应用科学学报 ›› 1995, Vol. 13 ›› Issue (2): 229-234.

聚酰亚胺(PI) LB膜中长链单轴取向排列的AFM研究

顾宁, 杨晓敏, 鲁武, 陆祖宏, 韦钰

东南大学

收稿日期:1993-07-05 修回日期:1993-11-06 出版日期:1995-06-30 发布日期:1995-06-30
基金资助:
国家自然科学基金

A STUDY ON LONG CHAIN SINGLE-AXIS ORIENTATION OF PI MOLECULES IN PI LB FILMS BY AFM

GU NING, YANG XIAOMIN, LU WU, LU ZHONG, WEI YU

Southeast University

Received:1993-07-05 Revised:1993-11-06 Online:1995-06-30 Published:1995-06-30

摘要/Abstract

摘要： 采用AFM来研究聚酰亚胺(PI) Langmuir-Blodgett (LB)膜中长链取向排列的技术条件,首先获得了清晰的,稳定性很好的PILB单/双层膜的AFM图像,并对PILB膜中分子水平的微结构进行了分析。随后比较了形成PILB膜的两种亚胺化工艺,即溶液亚胺化方法和热亚胺化方法对大面积内分子取向排列的影响,为进一步改善工艺条件以尽早将其投入实用奠定了初步基础。

关键词: 定向层, 聚酰亚胺(PI), Langmuir-Blodgett (LB)膜, 长链取向

Abstract: The microscopic molecular structure of a polyimide (PI) Langmuir-Blodgett (LB) film monolayer was studied by atomic force microscopy (AFM).An AFM image of a PI monolayer on highly oriented pyrolytic graphite (HOPG) showing clearly the polymer chains was observed. The measured parameters in situ,for example,the distance between oxygen atoms at successive bends is 1.4nm~1.9 nm and the bend angle is about 118 deg.,correspond with those from STM results by the others.The procedure in which the PA3S (polyamie acid alkyl amine salt) film was converted to polyimide film by either the heating method or the solution method is very important.The preliminary results of comparing these two technological processes observed by AFM indicated that the solution method is more suitable for this PI LB film preparation in the usage of the future liquid-crystal display devices.

Key words: Langmuir-Blodgett (LB) films, long chain orientation, aligning layer, Polyimide (PI)

顾宁, 杨晓敏, 鲁武, 陆祖宏, 韦钰. 聚酰亚胺(PI) LB膜中长链单轴取向排列的AFM研究[J]. 应用科学学报, 1995, 13(2): 229-234.

GU NING, YANG XIAOMIN, LU WU, LU ZHONG, WEI YU. A STUDY ON LONG CHAIN SINGLE-AXIS ORIENTATION OF PI MOLECULES IN PI LB FILMS BY AFM[J]. Journal of Applied Sciences, 1995, 13(2): 229-234.