Effect of structure on properties of polypyromellitimide films
Varma, I. K. ; Tripathi, Anita ; Goel, T. C. ; Murthy, K. R. ; Tripathi, A. K.
New York : Wiley-Blackwell
Published 1984
New York : Wiley-Blackwell
Published 1984
| ISSN: |
0360-6376
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|---|---|
| Keywords: |
Physics ; Polymer and Materials Science
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| Source: |
Wiley InterScience Backfile Collection 1832-2000
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| Topics: |
Chemistry and Pharmacology
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| Notes: |
Polypyromellitimides were prepared by the reaction of di(4-aminophenyl) ether (E)/di (4-aminophenyl) methane (M), and pyromellitic dianhydride in dimethylformamide, followed by thermal cyclization in a nitrogen atmosphere. Copolyimides were obtained by taking different molar ratios of diamines in the initial monomer feed. Differential scanning calorimetric, thermogravimetric analysis, and thermally stimulated current studies were carried out on these samples. It was concluded that the dielectric relaxation in these copolymers is due to trapping of the charge carriers. The dielectric relaxation parameters and activation energies were also calculated.
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| Additional Material: |
6 Ill.
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| Type of Medium: |
Electronic Resource
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| URL: |