Poly(2,4-dimethyl-1,4-phenylene oxide) (PPO), poly(benzo[1,2-d:5,4-d′]bisoxazole-2,6-diyl-1,4-phenylene) (PBO) and poly(benzo[1,2-d:4,5-d′]bisthiazole-2,6-diyl-1,4-phenylene) (PBZT), which are polymers with extended conjugated structures, undergo a self-sensitized photo-induced electron-transfer reaction. A second component is not required. This article presents many similar observations on these polymers when they are exposed to light and evidence to support the proposed photo-induced electron-transfer mechanism. Methods to stabilize these polymers against photo-oxidation are also described. Workers investigating other conjugated polymeric systems may find the experimental methods, observations and polymer stabilization approaches discussed in this review useful. Copyright © 2005 Society of Chemical Industry
PPO is an alloy of PPO and styrene. Due to its inherent chemical composition, PPO exhibits very low moisture absorption and offers excellent insulating properties and dimensional stability over a wide range of humidity and temperature.
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