高剂量γ辐照对SEBS/PS共混物性能的影响

Effects of high doses of gamma irradiation on the mechanical, electrical and thermal properties of SEBS/PS blends

研究了高剂量(0～2.0MGy)γ辐照对不同配比苯乙烯-乙烯-丁烯-苯乙烯嵌段共聚物/聚苯乙烯(SEBS/PS)共混物(100/0～50/50)力学性能、电性能以及热稳定性能的影响。结果表明,PS的加入,可以有效改善SEBS的辐照稳定性。PS的含量越高,辐照后SEBS/PS共混物的拉伸强度、体积电阻率的下降幅度越小,介电损耗因子的上升幅度越小,热稳定性能越好。但PS的加入减少了共混物中聚烯烃相的含量,使得共混物的断裂伸长率受辐照的影响较大,特别在高剂量辐照后,PS的含量越高的共混物断裂伸长率下降越明显。

The effects of high doses （0 - 2.0 MGy） of gamma irradiation, at room temperature and in the presence of air, on the mechanical, electrical and thermal behavior of styrene-ethylene-butadiene-styrene/polystyrene （SEBS/PS） blends （100/0 - 50/50） has been studied. From the obtained results, it has been indicated that the gamma irradiation stability of SEBS was enhanced by blending with PS. After the irradiation treatment, the tensile strength, volume resistivity of blends decreased and the dielectric dissipation factor of blends increased as the absorbed dose increased. Thermal analysis data show that the introduction of PS improved the thermal property of the blends. The decrease of polyolefin content with addition of PS in the blends made the elongation at break of blends decrease intensively with the increasing of absorbed dose, especially at high doses.