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Static and Dynamic Properties of Semi-Crystalline Polyethylene

机译:半结晶聚乙烯的静态和动态特性

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摘要

Properties of extruded polymers are strongly affected by molecular structure. For two different semi-crystalline polymers, low-density polyethylene (LDPE) and ultra-high molecular weight polyethylene (UHMWPE), this investigation measures the elastic modulus, plastic flow stress and strain-rate dependence of yield stress. Also, it examines the effect of molecular structure on post-necking tensile fracture. The static and dynamic material tests reveal that extruded UHMWPE has a somewhat larger yield stress and much larger strain to failure than LDPE. For both types of polyethylene, the strain at tensile failure decreases with increasing strain-rate. For strain-rates 0.001–3400 s−1, the yield stress variation is accurately represented by the Cowper–Symonds equation. These results indicate that, at high strain rates, UHMWPE is more energy absorbent than LDPE as a result of its long chain molecular structure with few branches.
机译:挤出聚合物的性能受分子结构的强烈影响。对于两种不同的半结晶聚合物,低密度聚乙烯(LDPE)和超高分子量聚乙烯(UHMWPE),本研究测量了弹性模量,塑性流动应力和屈服应力的应变率依赖性。此外,它研究了分子结构对颈后拉伸断裂的影响。静态和动态材料测试表明,与LDPE相比,挤出的UHMWPE具有更大的屈服应力和更大的破坏应变。对于两种类型的聚乙烯,拉伸破坏时的应变都随着应变率的增加而降低。对于0.001–3400 s −1 的应变速率,屈服应力变化可以用Cowper-Symonds方程精确表示。这些结果表明,在高应变速率下,UHMWPE比LDPE更具能量吸收性,这是由于其长链分子结构且分支很少。

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