M. Kotera, T. Nishino, K. Nakamae
May 1, 2000
Citations
1
Influential Citations
55
Citations
Journal
Polymer
Abstract
Abstract Processing of polyimide (PI) from precursor polyamic acid (PAA) involves simultaneous imidization, evaporation of residual solvent and crystallization. These overlapped processes were analyzed by temperature modulated differential scanning calorimetry (T-MDSC). Glass transition temperature (Tg) of precursor PAA was manifested by T-MDSC, and it was 107°C for pyromellitic dianhydride–oxidianiline (PMDA–ODA) PAA cast from N-methyl-2-pyrrolidone (NMP) solution. The thermal cyclization reaction from PAA to PI is considered to progress randomly. The solvent system for casting PAA, influenced the conversion to PI, which is found to affect the Tg of PAA.