Abstract
Compounds based on epoxy resins have proved their worth over many years as insulating parts for the electrical and electronics industries. Bisphenol-A-bisglycidylethers containing mineral fillers and cured with diacidanhydride are used, for instance, in the insulation of transformers. On the other hand, anionically cured bisphenol-A-bisglycidylethers are used in superconducting coils. In the cured state, the first system has polyester structures, the second, polyether moieties. The initial mechanical properties of both networks are very similar. The glass transition temperatures are 110°C and 130°C, the flexural strength is about 130 N/mm 2 and the impact strength ranges from 9 to 17 Nmm/mm 2. On thermal oxidative ageing, however, the systems behave very differently. An account is given of the thermal mechanical behaviour and of the weight loss above the glass transition temperature.
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