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首页> 外文期刊>Journal of Applied Polymer Science >Effect of molecular weight and branch content on the creep behavior of oriented polyethylene
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Effect of molecular weight and branch content on the creep behavior of oriented polyethylene

机译：分子量和支链含量对取向聚乙烯蠕变行为的影响

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Creep studies were carried out on a range of homopolymers and copolymers of polyethylene with well-defined molecular weight and branch content. The creep data were analyzed in terms of two thermally activated processes acting in parallel and the effects of molecular weight and branch content are discussed. It is shown that increasing either the number-average molecular weight or the weight-average molecular weight gives improved creep behavior at all stress levels. The introduction of butyl branches leads to lower creep at low-stress levels but can give rise to higher creep at high stress. Plots of the equilibrium log(10)(strain rate) versus stress at fixed draw ratio (strain) can be used to define sections through a unique true stress/true strain/strain rate surface for each material. These creep results have an additional value in terms of the link between slow crack propagation (SCG) in polyethylene and fibril creep, confirming the proposal made elsewhere that SCG can be quantified in terms of creep to failure across the true stress/true strain/strain rate surface. (C) 2003 Wiley Periodicals, Inc. [References: 15]
机译：对一系列具有明确定义的分子量和支链含量的聚乙烯均聚物和共聚物进行了蠕变研究。对蠕变数据进行了分析，分析了两个平行作用的热活化过程，并讨论了分子量和支链含量的影响。结果表明，增加数均分子量或重均分子量可改善所有应力水平下的蠕变行为。引入丁基支链可在低应力水平下降低蠕变，但在高应力下则可以引起较高的蠕变。平衡对数（10）（应变率）与固定拉伸比（应变）下的应力的关系图可用于通过每种材料的唯一真实应力/真实应变/应变率表面来定义截面。这些蠕变结果在聚乙烯中的慢速裂纹扩展（SCG）和原纤维蠕变之间具有联系，因此具有其他价值，这证实了在其他地方提出的建议，即SCG可以根据在真实应力/真实应变/应变下的蠕变至破坏进行量化。率表面。 （C）2003 Wiley Periodicals，Inc. [参考：15]

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