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首页> 外文期刊>Journal of Applied Polymer Science >Fracture Energies and Tensile Strength of an EPDM/PP Thermoplastic Elastomer
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Fracture Energies and Tensile Strength of an EPDM/PP Thermoplastic Elastomer

机译：EPDM / PP热塑性弹性体的断裂能和拉伸强度

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摘要

Measurements of the tear strenght of EPD/PP thermoplastic elastomers (EPDM/PP TPEs, Santoprene 201-87) were carried out at various rates and temperature. In addition, a cutting technique developed recently was adopted to measure the fracture energy in a process where a well-controlled geometry of the crack tip was obtained. Results show that the EPDM/PP TPEs possess a relatively high tear strength of 10.40 ± 0.94 kJ/m~2 at room temperature. Furthermore, good tear strength is still preserved. about 1.87 ± 0.38 kJ/m~2, at 150degC, where some PP crystals are melted and start of flow. In contrast, the intrinsic strength of EPDM/PP TPEs determined from a cutting test is varied slightly, 700-1000 J/m~2, over a wide range of temperatures and rates. A comparison of the fracture energy measured by tearing and cutting tests is provided and discussed. The energy density per unit volume of EPDM/PP TPEs determined from the cutting test is 9.7 GJ/m~3, which is about twice larger than that for the rupture of C-C bonds at room temperature. It is suggested that plastic yielding is a more effective process to enhance the toughness than is simply viscoelastic motion.
机译：EPD / PP热塑性弹性体（EPDM / PP TPE，Santoprene 201-87）的撕裂强度的测量是在不同的速率和温度下进行的。另外，采用了最近开发的切割技术来测量在获得裂纹尖端的良好控制的几何形状的过程中的断裂能。结果表明，EPDM / PP TPE在室温下具有相对较高的撕裂强度，为10.40±0.94 kJ / m〜2。此外，仍然保持良好的撕裂强度。在150°C时约1.87±0.38 kJ / m〜2，其中一些PP晶体熔化并开始流动。相比之下，通过切割测试确定的EPDM / PP TPE的固有强度在很宽的温度和速率范围内略有变化，为700-1000 J / m〜2。提供并讨论了通过撕裂和切割试验测得的断裂能的比较。由切削试验测得的EPDM / PP TPE的单位体积能量密度为9.7 GJ / m〜3，约为室温下C-C键断裂的能量密度的两倍。建议塑性屈服比单纯的粘弹性运动是一种更有效的增强韧性的方法。

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