Journal
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
Volume 93, Issue 1, Pages 63-68Publisher
SPRINGER
DOI: 10.1007/s10973-007-8801-5
Keywords
aromatic poly(amic acid)s; dynamic mechanical analysis; polyimides; oxadiazole rings
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Two aromatic polyimides and the corresponding poly(amic acid)s, with oxadiazole and para/meta phenoxyphenylene rings in the backbone, were synthesized and the structure - thermal properties correlation was followed by dynamic mechanical analysis. Concerning the poly(amic acid)s, the glass transition domain was emphasized only for the compound with meta-oriented rings because the process of imidization takes place with increasing temperature. A multiplex experiment was performed to calculate the activation energy of the transition localized under 200C. Consecutive heating-cooling-heating cycles were accomplished. All phenomena are discussed by cross-examination of the storage modulus (E'), loss modulus (E) and loss factor tan delta variation with temperature.
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