Journal
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Volume 40, Issue 2, Pages 229-234Publisher
JOHN WILEY & SONS INC
DOI: 10.1002/pola.10105
Keywords
one-pot methods; polycondensation; polyimides; high solubility; tert-butyl groups
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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.
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