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首页> 外文期刊>Journal of Applied Polymer Science >Toughness of SMI-Modified ABS Alloys and the Associated Deformation Behavior
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Toughness of SMI-Modified ABS Alloys and the Associated Deformation Behavior

机译：SMI改性ABS合金的韧性和相关的变形行为

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The mechanical toughness toughness of modified ABS (acrylonitrile-butadiene-styrene) alloys was evaluated using lzod impact,and compact tension tests.The modified ABS alloys contain 20 wt % of styrene-N-phenylmaleimide (SMI) that is added to enhance the thermal resistance of the ABS.In this study,the effects of matrix composition,rubber/matrix adhesion,and rubber particle structure on the alloy toughness were investigated.Results form the tensile test and Izod impact test ranked the alloys in an order that is different from that given by K_(Ii) (stress intensity factor for crack initiation),measured from compact tension specimens.This is due to the difference in energy-absorption characteristics for crack initiation and crack growth.The conclusion is supported by optical micrographs on the deformation zone size.The microdeformation behavior of the alloys was examined using transmission electron microscopy (TEM),which revealed different rubber-toughening mechanisms between Izod and tensile specimens.The former contains mumerous extensive crazes,while the latter,only a very few short crazes,except in regions within a few micrometers from the fracture surface.The dominant matrix deformation mechanism for the tensile specimens is believed to be shear deformation.Another interesting observation from the study is rubber particle cavitation,commonly observed in tensile specimens and Izod specimens wiht solid rubber particles;it did not occur in the Izod specimens containing salami-type rubber particles.This is attributed to the salami structure that increased the straining rate for the rubber phase,leading to ductile-brittle transition of the rubber.The transition to brittle deformation of the rubber phase prevented rubber particle cavitation.The microscopic examination indicated that toughening mechanisms by the rubber particles cna be very different among the mechanical tests,which should be taken into account for the rubber toughening of polymers.
机译：改性的ABS（丙烯腈-丁二烯-苯乙烯）合金的机械韧性韧性通过艾佐德冲击力和紧凑的拉伸试验进行了评估。改性的ABS合金包含20 wt％的苯乙烯-N-苯基马来酰亚胺（SMI），可增强热稳定性本研究研究了基体组成，橡胶/基体附着力以及橡胶颗粒结构对合金韧性的影响。拉伸试验和艾佐德冲击试验的结果对合金的排名顺序与由致密拉伸试样测量的K_（Ii）（裂纹萌生的应力强度因子）给出的应力，这是由于裂纹萌生和裂纹扩展的能量吸收特性不同所致。结论由光学显微照片证明用透射电子显微镜（TEM）检查了合金的微形变行为，揭示了伊佐德和数十埃之间的不同的橡胶增韧机理。前者包含数不清的大范围裂纹，而后者仅包含很少的短裂纹，但距断面几微米的区域除外。拉伸样品的主要基体变形机理被认为是剪切变形。研究中有趣的发现是橡胶颗粒空化，通常在拉伸样品和带固体橡胶颗粒的悬臂梁样品中观察到;在含有萨拉米型橡胶颗粒的悬臂梁样品中没有发生这种现象，这归因于萨拉米结构增加了应变率对于橡胶相，导致橡胶的脆性-脆性转变。橡胶相向脆性变形的转变防止了橡胶颗粒的气穴现象。微观检查表明，橡胶颗粒的增韧机理在机械试验之间存在很大差异，聚合物的橡胶增韧应考虑在内。

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