Paper number 471

THE MECHANICAL PROPERTY CHANGE OF A NEWLY DEVELOPED EPOXY SYSTEM AT HIGH TEMPERATURE AND OXIDATIVE CONDITIONS

Jae-Rock Lee¹, Soo-Jin Park¹ , and Yeung-Keun Kim²

1Advanced Materials Division, Korea Research Institute of Chemical Technology, P.O. Box 107, Yusong, Taejon 305-600, Korea
2Kangnam Industrial Co., Sunggok, Ansan, Kyunggi 425-110, Korea

Summary

A newly developed cationic catalyst, N-Benzylpyrazinium hexafluoroantimonate (BPH) has been used to cure epoxies. The effect of the catalyst concentrations on the thermal and mechanical properties has been studied. The used catalyst concentrations are 0.5, 1, 2, 3 and 5wt.%. Two given maximum retention times, i.e., 1028 hours at 265°C and 8 hours at 300°C were studied in terms of the mechanical flexural and impact properties in the presence of different concentrations of BPH in air condition. The BPH cured epoxies showed excellent thermo-oxidative resistance. Their mechanical properties nearly remained intact for the short retention times less than 12 hours. The maximum weight losses were about 4.5wt.% at 300°C and 12wt.% at 265°C. At 265°C, the finally retained flexural and impact strengths were respectively more than 30% and 40% on the basis of their initial values after the very long retention time of 1028 hours for the adequate catalyst concentrations of 1 and 2 wt. %.

Keywords

N-Benzylpyrazinium hexafluoroantimonate, flexural and impact properties, thermo-oxidative resistance.