Annealing of aromatic polyimide precursors
作者： N. T. Wakelyn
DOI:
关键词: Polymer 、 Infrared spectroscopy 、 Polyimide 、 Differential thermal analysis 、 Polymer chemistry 、 Atmospheric temperature range 、 Thermogravimetric analysis 、 Crystallography 、 Monomer 、 Polymerization 、 Materials science
摘要: A study has been made of the thermal behavior polyimide precursors: an isomeric pair crystals complex formed by p-phenylenediamine with separated isomers di-isopropyl ester pyromellitic acid. Specimens this material were isothermally annealed in temperature range 120 C to 170 for periods time up 1 week. Although is well below that customarily used imidizations, working hypothesis was it would be more likely a polymer embodying at least part precursor structure could if molecular motion minimized actually required formation imide linkage. The progress annealing followed by: infrared spectroscopy, differential analysis, powder X-ray diffraction, and gravimetric analysis. Single crystal analysis meta monomer yields chains alternating acid base suggests amenable polymerization minimum geometrical disruption.
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