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首页> 外文期刊>Journal of Applied Polymer Science >Fracture Behavior of Dynamically Vulcanized Thermoplastic Elastomers
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Fracture Behavior of Dynamically Vulcanized Thermoplastic Elastomers

机译：动态硫化热塑性弹性体的断裂行为

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The energetics and micromechanisms of fracture in model dynamcially vulcanized thermoplastic elastomers have been studied. Their fracture toughness vlaues have been quantified under mode 1 loading conditions using both the critical J-integral approach and an essential work-of-fracture method. Additional studies evaluating the effect of specimen geometry are reported. For these studies it was found that center-notched and double edge-notched test geometries were equivalent under J-integral test conditions. The effect of elastomer composition was also studied with regard to fracture resistance. Increasing the weight percentage fo both elastomer and processing oil caused a considerable decrease in both the material's resistance to both fracture initiation and fracture propagation. Increasing the moelcualr weight of the thermoplastic phase caused a smaller reduction in fracture resistance. The phase morphology of one model compound, TPE6114, consists of an isotactic polypropylenerich matrix containing discrete elastomer-rich domains of a diameter of 1-3 #mu#m. A process zone was associated with fracture in this material. The process zone consists of an array of voids and crazes that were 10-30 #mu#m in diameter, an order of magnitude larger than the elastomer-rich domains. These were characterized by scanning electron microscopy (SEM) and optical microscopy. The crazes were found to grow at an angle oblique to the overall crack growth direction. Ruthenium stained SEM sampels showed that these crazes and voids occur in both the polypropylene and elastomer domains, and that at least some of the craze fibrils are composed of the elastomeric phase.
机译：已经研究了模型动力硫化的热塑性弹性体中断裂的能量学和微观机理。他们的断裂韧性值已在模式1加载条件下使用临界J积分方法和基本的断裂功方法进行了量化。报告了评估样品几何形状影响的其他研究。对于这些研究，发现在J积分测试条件下，中心凹口和双边缘凹口测试几何形状是等效的。还针对抗断裂性研究了弹性体组合物的作用。弹性体和加工油的重量百分比增加导致材料对断裂引发和断裂扩展的抵抗力大大降低。热塑性相的摩尔重量增加导致抗断裂性的降低较小。一种模型化合物TPE6114的相形态由全同立构的富含聚丙烯的基质组成，该基质包含直径为1-3＃μm的离散的富含弹性体的域。加工区与这种材料的断裂有关。加工区由一系列直径为10-30＃μm的空隙和裂纹组成，比富含弹性体的区域大一个数量级。这些通过扫描电子显微镜（SEM）和光学显微镜表征。发现这些裂纹以相对于整体裂纹扩展方向倾斜的角度生长。钌染色的SEM样品显示，这些裂纹和空隙同时出现在聚丙烯和弹性体域中，并且至少一些裂纹原纤维由弹性体相组成。

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