Abstract
Polysiloxaneimides (PSI) were synthesized by polycondensation of 3,3′,4,4′-benzophenone tetracarboxylic dianhydride (BTDA) with oxydianiline (ODA) and amino-terminated siloxanes of varying molecular weights. The structures of the PSI copolymers were characterized by infra-red (IR), 29Si and 13C nuclear magnetic resonance (NMR) spectroscopies. The dynamics in the interface of PSI copolymers were investigated by proton spin-spin relaxation measurements. The apparent activation energy for degradation of PSI copolymers both in nitrogen and air was studied by thermogravimetry and compared with that of the unmodified polyimide. The activation energies of the degradation process in nitrogen decreased approximately with increasing siloxane content, whereas those in air increased.
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