极性化SBS／PS共混改性热塑性弹性体制备及性能研究

采用双螺杆挤出机熔融共混法制备了极性化SBS（PSBS）／聚苯乙烯（PS）共混热塑性弹性体，研究了PS、过氧化二异丙苯（DCP）含量等因素对PSBS／PS热塑性弹性体的加工流动性能、力学性能、界面相容性及微观形态等的影响。结果表明，加入PS可明显改善PSBS的熔融加工流动性能和力学性能。PS含量越高，PSBS／PS共混热塑性弹性体材料的力学性能越好，但PS含量不能超过50％（质量分数，下同），否则会因连续相倒置导致共混材料失去弹性体性能。加入适量DCP可引发共混体系中PS分子链及PSBS中的“S”嵌段、“B”嵌段之间的共交联及适度自交联，并形成相对较小的交联体颗粒尺寸，使PSBS／PS共混热塑性弹性体材料力学性能进一步提高。

Properties of Polar SBS/PS Thermoplastic Elastomer Prepared by Blending Modification

PSBS/PS thermoplastic elastomer was prepared by melting extrusion on a twin-screw extruder. The effect of PS and DCP contents on the processing flowability, mechanical properties, interracial compatibility and micro-morphology of PSBS/PS thermoplastic elastomer were studied. The results showed the processing flowability and mechanical properties were improved significantly with the addition of PS. However, the PS content had to be limited below 50 wt %, otherwise the phase inversion would occur and the materials would lose their properties of thermoplastic elastomers. DCP may initiate co-crosslinking and moderate self-crosslinking of S and B chains, resulting in improvement in mechanical properties.