Thermal degradation study of polymerization of monomeric reactants (PMR) polyimides

A novel PMR polyimides (TMBZ-15) based on substituted benzidines is examine d and compared to state-of-the-art PMR-15. The mechanism for the thermal de composition of two specific PMR polyimides is obtained using TG/FTIR/MS tec hniques. In order to verify the pathway of polyimide degradation, a pyrolys is/GC-MS technique was employed to evaluate the organic degradation product s, particularly the larger components that are destroyed in traditional TG/ MS. A proposed degradation mechanism involves two main stages of decomposit ion, each of which produce a variety of products. The first group includes aromatic hydrocarbons, aromatic amines and nitriles, which correspond to pa rtial fragments of polymer chains. The second group consists largely of flu orene, naphthalene and phenanthrene, which are attributed to the isomerizat ion, rearrangements and cyclizations of the aforementioned pyrolyzates at h igh temperature.