Aromatic diamines containing SO2 and S moieties have been used to prepare soluble polyimides with ditrifluoromethyl methane bis(phthalic anhydride) (F‐series polyimides) and polyamic acid with pyromellitic dianhydride (P‐series). Gamma radiolysis gave G(S) values for scission between 1 to 2 with no crosslinking. Significant weight loss occurred with radiolysis is attributable to efficient SO2 bond scission for the F‐series polyimides, as well as imidization in the cases of P‐series polyamic acids.
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James C. W. Chien (1989) studied this question.
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