期刊
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
卷 40, 期 2, 页码 229-234出版社
JOHN WILEY & SONS INC
DOI: 10.1002/pola.10105
关键词
one-pot methods; polycondensation; polyimides; high solubility; tert-butyl groups
Several highly soluble polyimides were synthesized from various aromatic tetracarboxylic dianhydrides and an aromatic diamine containing tert-butyl pendent groups [4,4 ' -methylenebis(2-tert-butylaniline)]. All the polyimides showed excellent solubility in common solvents such as chloroform, tetrahydrofuran, and dioxane at room temperature. The number-average molecular weight ranged from 3.6 X 10(4) to 1.3 X 10(5) according to gel permeation chromatography relative to a polystyrene standard, and the polydispersity index was between 1.9 and 2.5. The glass-transition temperatures of the resulting polyimides ranged from 213 to 325 degreesC, as measured by differential scanning calorimetry, and little weight loss was observed up to 450 degreesC in N, by thermogravimetric analysis. These experimental data indicated that the tert-butyl pendent groups reduced the interactions among polymer chains to improve their solubility in organic solvents without the loss of thermal stability. Transparent and flexible films of these polyimides were obtained via casting from solution. (C) 2001 John Wiley & Sons, Inc.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据