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首页> 外文期刊>RSC Advances >Investigation of morphology, mechanical, dynamic mechanical and thermal behaviour of blends based on ethylene vinyl acetate (EVA) and thermoplastic polyurethane (TPU)
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Investigation of morphology, mechanical, dynamic mechanical and thermal behaviour of blends based on ethylene vinyl acetate (EVA) and thermoplastic polyurethane (TPU)

机译：研究基于乙烯乙酸乙烯酯（EVA）和热塑性聚氨酯（TPU）的共混物的形态，力学，动态力学和热行为

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摘要

Novel blends based on ethylene vinyl acetate/thermoplastic polyurethane (EVA/TPU) at different ratios were prepared via the melt blending technique. Scanning electron microscopy (SEM) studies revealed primarily a two phase morphology in which the minor TPU phase was dispersed in the major continuous EVA matrix. However in the 50/50 blend EVA and TPU appear as a co-continuous phase. The influence of blend ratio on the mechanical properties and hardness was investigated. An 80/20 EV/TPU blend was observed to exhibit optimum tensile strength and elongation at break. Various models have been applied to predict the change in modulus with blend composition. The Veenstra B model was found the best to correlate the experimental modulus values. All the blends show a single T-g and a shift in T-g with change in blend composition was observed through differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA), indicating technological compatibility. Thermogravimetric analysis (TGA) was performed to study the thermal stability of the EV/TPU blends. Incorporation of TPU has also been found to improve the oil resistance properties of the blend system.
机译：通过熔融共混技术制备了基于乙烯乙酸乙烯酯/热塑性聚氨酯（EVA / TPU）的不同比例的新型共混物。扫描电子显微镜（SEM）研究主要显示出两相形态，其中次要的TPU相分散在主要的连续EVA基质中。但是，在50/50的混合物中，EVA和TPU表现为共连续相。研究了混合比对机械性能和硬度的影响。观察到80/20 EV / TPU共混物表现出最佳的拉伸强度和断裂伸长率。已经应用了各种模型来预测模量随共混物组成的变化。发现Veenstra B模型与实验模量值最相关。所有共混物均显示出单一的T-g，并且通过差示扫描量热法（DSC）和动态力学分析（DMA）观察到T-g随共混物组成的变化，表明了技术兼容性。进行热重分析（TGA）以研究EV / TPU共混物的热稳定性。还发现掺入TPU可改善共混体系的耐油性。

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