بررسی اثر عوامل پخت دوگانه و سه‌گانه بر عمرکاربری سیستم بایندر برپایه HTPB

The aim of this research was to investigate using binary and tertiary curatives on pot life of binder system based on HTPB using less reactive ones such as IPDI and HDI in combination with TDI. Polymerization rate in the presence of each of TDI, IPDI and HDI curatives was individually studied using rheological method at 60 °C, which a two-step kinetic behavior (for TDI and IPDI) was observed. Measuring the pot life of binders using binary curative systems of TDI:IPDI and TDI:HDI with 1:3 ratio, showed pot lives of 285 min (about 12% increase in comparison to single TDI system) and 195 min (about 24% decrease in comparison to single TDI system), respectively. The important point was abnormal decrease in pot life for binder system with binary curing agent of TDI-IPDI, which could be relating a catalytic role to HDI. In continuous, HDI was added to binary curing system of TDI-IPDI (with pot life of 285 min) as third curative. The pot life of tertiary curing system of TDI-IPDI-HDI reached to 270 min with 15 min decrease, which can emphasize again the catalytic role hypothesis of HDI in the polymerization reaction.