Effects of the blend ratio and crosslinking systems on the curing behavior, morphology, and mechanical properties of styrene–butadiene rubber/poly(ethylene‐co‐vinyl acetate) blends
Effects of the blend ratio and crosslinking systems on the curing behavior, morphology, and mechanical properties of styrene–butadiene rubber/poly(ethylene‐co‐vinyl acetate) blends
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DOI：
10.1002/app.20939
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发表时间：
2004-10
影响因子：
3
通讯作者：
C. K. Radhakrishnan;A. Sujith;G. Unnikrishnan;Sabu Thomas
中科院分区：
文献类型：
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作者：
C. K. Radhakrishnan;A. Sujith;G. Unnikrishnan;Sabu Thomas
采用双辊混炼机制备了不同配比的丁苯橡胶（SBR）/乙烯-醋酸乙烯酯共聚物（伊娃）共混物，并分别用硫磺（S）、过氧化二异丙苯（Dicumyl Peroxide）以及S与过氧化物的混合物（Mixed）三种不同的交联体系进行硫化。通过流变仪分析了共混物的硫化行为。研究了共混物的力学性能，包括应力-应变行为、拉伸强度、断裂伸长率、模量、硬度和耐磨性。用扫描电子显微镜研究了所制备的共混物的形态，特别是共混比和交联体系的影响。对于20/80 SBR/伊娃组合物观察到相对共连续的形态。对于所有的挤出模式，机械性能随着伊娃含量的增加而增加，直到60- 80%。在扫描电子显微镜下分析拉伸断裂表面以了解失效机制。应用各种理论模型来解释共混物的性质。© 2004 Wiley Periodicals，Inc.应用聚合物科学杂志94：827-837，2004
Blends of styrene–butadiene rubber (SBR) and poly(ethylene-co-vinyl acetate) (EVA) with different ratios were prepared with a two-roll mixing mill and were vulcanized by three different crosslinking systems, namely, sulfur (S), dicumyl peroxide, and a mixture consisting of S and peroxide (mixed). The vulcanization behavior of the blends was analyzed from the rheographs. The mechanical properties, including stress–strain behavior, tensile strength, elongation at break, modulus, hardness, and abrasion resistance, of the blends were examined. The morphology of the prepared blends was studied with scanning electron microscopy with special reference to the effects of the blend ratio and crosslinking systems. A relatively cocontinuous morphology was observed for the 20/80 SBR/EVA composition. The mechanical properties increased with increasing EVA content up to 60–80%, for all of the vulcanizing modes. The tensile fracture surfaces were analyzed under a scanning electron microscope to understand the failure mechanism. Various theoretical models were applied to explain the properties of the blends. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: 827–837, 2004