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O. Pokorska-Młodzińska, Z. Pokorska, M. Spadło

Thermal and dielectric properties of some epoxy compositions

Polimery 2007, No 2, 127


Summary

Thermal properties (glass transition temperature Tg values) of the eight epoxy compositions consisted of various commercial epoxy resins and epoxy-novolaks, cured with novolaks themselves or combined with dicyandiamide in the presence of 2-ethyl-4-methylimidazole as a catalyst (Table 1). Composition 1 was another system cured just with triethylenetetramine, without a catalyst. The compositions tested, except for the last one, showed similar high Tg values (on average 188°C), independent on the composition constitution. Dielectric properties (dielectric constant e and loss factor tg δ) of three compositions were determined. Dependences of these properties on temperature (20-200°C) and frequency (0.01-10 000Hz) were characterized (Table 2-4). It was found that two compositions (No. 6 and 7 in Table 1) fulfill the requirements for electronic and electrical engineering goods, at T g conditions.


Key words: epoxy compositions, constitution, glass transition temperature, dielectric constant, loss factor


O. Pokorska-Młodzińska, Z. Pokorska, M. Spadło

Thermal and dielectric properties of some epoxy compositions