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首页> 外文期刊>Plastics, Rubber and Composites >Experimental and theoretical study of uniaxial deformation of amorphous poly(ethylene terephthalate) above glass transition temperature
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Experimental and theoretical study of uniaxial deformation of amorphous poly(ethylene terephthalate) above glass transition temperature

机译：玻璃化转变温度以上无定形聚对苯二甲酸乙二醇酯单轴变形的实验和理论研究

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Uniaxial deformation of amorphous thick and massive poly(ethylene terephthalate) (PET) samples above the glass transition temperature has been studied in the temperature range relevant to the stretch-blow moulding process of PET bottles. A video controlled system coupled to a novel clamping device, together with accurate control of the thermal gradient in the material, make it possible to determine true stress V. true strain data at constant true strain rate up to very high strains of ～2.5. The mechanical response of PET in these conditions is modelled as a molecular network exhibiting a rubber-like behaviour. Sufficiently far from the alpha transition, it is shown that the Edwards and Vilgis model is able to reproduce experimental data accurately, which also offers a relevant insight into the nature of the molecular networks. Closer to the alpha transition, this purely hyperelastic model needs refining and improving to take into account an additional non-elastic contribution.
机译：在与玻璃瓶拉伸吹塑工艺相关的温度范围内，研究了高于玻璃化转变温度的无定形厚实块状聚对苯二甲酸乙二醇酯（PET）样品的单轴变形。视频控制系统与新颖的夹紧装置相连，再加上对材料中热梯度的精确控制，使得可以确定恒定应力下的真实应力V.真实应变数据，直到2.5的非常高的应变。在这些条件下，PET的机械响应被建模为表现出类似橡胶行为的分子网络。足够远离α跃迁，表明Edwards和Vilgis模型能够准确地再现实验数据，这也为分子网络的性质提供了相关的见识。接近alpha过渡时，此纯超弹性模型需要完善和改进，以考虑到其他非弹性贡献。

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