Mechanical properties and fractal morphology of high-impact polystyrene/poly(styrene-b-butadiene-b-styrene) blends
Mechanical properties and fractal morphology of high-impact polystyrene/poly(styrene-b-butadiene-b-styrene) blends
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DOI：
10.1016/j.polymdegradstab.2005.02.021
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发表时间：
2005-11-01
影响因子：
5.9
通讯作者：
Rek, V
中科院分区：
文献类型：
--
作者：
Jelcic, Z;Hojevac-Grguric, T;Rek, V
本文研究了高抗冲聚苯乙烯（HIPS）和聚苯乙烯-b-聚丁二烯-b-聚苯乙烯嵌段共聚物（SBS）（热塑性弹性体，Kraton D1101）的共混物，并考虑了回收利用。研究了SBS弹性体含量高达85%的HIPS/SBS二元弹性体体系。共混物的特征在于通过测量动态力学性能，蠕变和恢复，并通过定义形态。非均相共混物表现出两相形态。通过扫描电子显微镜（SEM）研究了这种结构，并将其与作为SBS含量的函数的机械和加工性能进行了比较。随着SBS含量的增加，PS相关的脆性断裂消失，而SBS相关的韧性断裂出现。HIPS/SBS 90/10共混物的力学性能最好。采用分形分析软件对聚合物共混物断裂表面形貌图像进行处理，得到了表面的分形指数。苯乙烯共混物（HIPS/SBS）的断裂表面的平均（经典）分形指数小于2。这些分形结果与共混物的力学性能和从加工参数（扭矩、熔体压力）的时间序列获得的Hurst粗糙度指数相关。因此，它被认为是在良好的协议，即使对于非均相聚合物共混材料的断裂表面的分形特性的加工和机械的结果。(c)2005爱思唯尔有限公司保留所有权利。
Blends of high-impact polystyrene (HIPS) and polystyrene-b-polybutadiene-b-polystyrene block copolymers (SBS) (thermoplastic elastomers, Kraton D1 101) have been studied with recycling in view. Binary HIPS/SBS elastomer systems containing up to 85% of SBS elastomer were investigated. The blends were characterized by measuring dynamic mechanical properties, creep and recovery, and by defining morphology. The heterogeneous blends exhibit a two-phase morphology. This structure is investigated by scanning electron microscopy (SEM) and compared to mechanical and processing properties as a function of SBS content. Increasing the SBS content one observes a vanishing PS-related brittle type of fracture, while an SBS-related ductile fracture emerges. Best mechanical properties are obtained for HIPS/SBS 90/10 blends. The topographical images of polymer blend fracture surfaces were processed using fractal analysis software to obtain the fractal indices of the surfaces. The average (classical) fractal index was less than two for the fracture surfaces of styrenic blends (HIPS/SBS), These fractal results were correlated with the blend mechanical properties and with the Hurst roughness exponent, obtained from the time series of processing parameters (torque, melt pressure). Hence, it is considered that the processing and mechanical results are in good agreement with the fractal properties of the fracture surfaces even for heterogeneous polymer blend materials. (c) 2005 Elsevier Ltd. All rights reserved.