The phthalide‐containing epoxy resins are synthesized and characterized in comparison with the bisphenol‐A epoxy resins in terms of thermal properties. Although both resins contain comparable amounts of halogens, the resulting flame retardancy is higher in the phthalide‐containing resin. The char formation upon pyrolysis is also enhanced by the phthalide functionality.
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Lo et al. (1984) studied this question.
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