Polyolefin blend type thermoplastic elastomers (TPEs) were prepared via melt blending method in a twin screw extruder by using isotactic polypropylene (i-PP), three different styrene-olefin triblock copolymers (SEBS-1 and SEBS-2 having a styrene content of 30 wt.% and 60 wt.%, respectively and SEEPS having a styrene content of 30 wt.%) and paraffinic oil. Composition-dependent and time-dependent viscoelastic properties of compounds were determined by various test procedures conducted in a rotational rheometer in melt state. It was found that the content of polystyrene blocks (or hard segment) in copolymers governed the rheological behaviors of compounds. It can be concluded that the increasing amount of styrene-olefin block copolymer or content of glassy domains into blend composition reduces miscibility between polyolefin and elastomer phases and also yields higher melt elasticity and viscosity, longer relaxation times, lower creep strain and compliance values at relatively longer time scale.

中文翻译：

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聚烯烃共混型热塑性弹性体的流变行为研究，用于量化微观结构-性能关系

聚烯烃共混型热塑性弹性体（TPEs）是通过等规聚丙烯（I）在双螺杆挤出机中通过熔融共混法制备的。-PP），三种不同的苯乙烯-烯烃三嵌段共聚物（SEBS-1和SEBS-2的苯乙烯含量分别为30 wt。％和60 wt。％以及SEEPS的苯乙烯含量为30 wt。％）和石蜡油。通过在熔融状态下在旋转流变仪中进行的各种测试程序来确定化合物的成分依赖性和时间依赖性的粘弹性质。发现共聚物中聚苯乙烯嵌段（或硬链段）的含量决定了化合物的流变行为。可以得出结论，苯乙烯-烯烃嵌段共聚物数量的增加或共混物组合物中玻璃状结构域的含量降低，聚烯烃和弹性体相之间的互溶性降低，并且在相对较低的温度下还具有更高的熔体弹性和粘度，更长的弛豫时间，更低的蠕变应变和柔度值。时间尺度更长。