Authors:T. Fujimura, N. Sarugaku, M. Tsuchiya, K. Ishimaru, and T. Kojima
The TG analyses are given for variously meta- and/or para-linked aromatic polyamides with various benzimidazolyl (BI)contents.
The TG curves of the polymers were evaluated within 600C by use of an equation for multiple events. The TG curves of BI-substituted
polymers are expressed for triple events, though the TG curves of unsubstituted polymer are expressed for double events. The
amount of residue of BI-substituted polymers at 800C is larger than that of unsubstituted polymers, perhaps because moieties
concerning BI degrade at higher temperatures.
Authors:H. Abematsu, M. Tsuchiya, Y. Iseri, and T. Kojima
The TG studies are presented for isomers of benzimidazolyl-substituted polyamides (BIPA). The TG data are compared with those
polyamides (PA) of identical backbones without substitution, in view of the mechanism of thermal degradation. The TG mass
loss curves divided to three temperature ranges reflect the decomposition reactions in the respective temperature ranges:
(1) cleavage of single bonds of nitrogen to aromatic ring, (2) random scission of single bonds, (3) condensation of the remained
rings. Liberation of benzimidazole rings occurs in the temperature range (2). The final product, char, contains benzimidazole
rings. Terephthaloyl-rich BIPA's retard liberation of benzimidazole from the decomposed polymer.