The poly-1

2-butadiene prepared with FeCl3-(i-C4H2)3Al-phen catalyst system (Fe-)

as with MoCl4OR-(i-Bu)2AlOR' system (Mo-)

is also amorphous. For different 1

2-unit content poly-l

2-butadienes

both thermo-oxidative exothermic peak-temperatures on dynamic DSC curves and induction times determined from constant temperature experiments increase with increasing 1

2-unit contents.The exothermic peak disappears for the sample hydrogenated high cis-l

4-polybutadiene

but an endothermic peak at -120℃ appears

corresponding to the melting point of PE. The thermo-cross-linking exothermic peak temperatures of poly-1

2-butadienes decreased with increasing yinyl group content in macromolecult. The peak areas on DSC curves of samples poly-1

2-butadiene after hydrosilylation with (CH3)3SiH in nitrogen atmosphere were decreased. The apparent thermo-oxidative activation energies for polymers prepared by Fe-and Mo catalyst system are 88-93

99-105kJ mol-1 respectively

and their thermo-cross-linking acti-vation energies are 164-185kJ mol-1. These results show that thermo- and thermo-oxidative stabilities of these polymers prepared with differen catalyst system are similar.