HIPS／PP熔融反应共混及其动态力学性质

研究了高抗冲聚苯乙烯（HIPS）／聚丙烯（PP）共混物在过氧化二异丙苯（DCP）存在下的熔融反应过程及其动态力学性质．HIPS在DCP存在下以聚苯乙烯（PS）的降解为主，伴随着聚丁二烯（PB）的交联和接枝，PP在DCP存在下以降解为主，HIPS／PP在DCP存在下以PP同HIPS的反应接枝为主，这种原位生成的增容剂显著地改善了HIPS／PP两组份间的相容性，其分子运动特征较前两者发生明显变化，PS的Tg下降，PB和PP的Tg升高．

Study on the Melting Reactive Mixing and Dynamic Mechanical Properties of HIPS/PP Blends

The melt reactive blending and dynamic mechanical properties of HIPS/PP blendsin the presence of dicumyl peroxide(DCP) were studied. The results show that the degradation of PS was the main process in HIPS/DCP mixture while the cross-linking and graftingare the predominate in the PB phases. PP was degraded when it was "dxed with DCP inmolten state. However, the grafting of PP onto HIPS was a main process in HIPS/PP/DCPblends. The characteristic of molecular motion in HIPS/PP/DCP blends is significantly different from that in HIPS/PP blends. The glass transition temperature of PS phase was decreased and that of PB and PP phases were increased. The melt reaction mixing of HIPS/PPblends led to the in-situ compatibilization.