Role of the entangled amorphous network in tensile deformation of semicrystalline polymers
Role of the entangled amorphous network in tensile deformation of semicrystalline polymers
复制标题
DOI：
10.1103/physrevlett.91.095502
复制
发表时间：
2003-08-29
影响因子：
8.6
通讯作者：
Strobl, G
中科院分区：
文献类型：
--
作者：
Men, YF;Rieger, J;Strobl, G
由于半结晶聚合物是由结晶层状结构和缠结在其间的无定形高分子链组成，因此在拉伸变形时往往表现出复杂的变形行为。近年来，拉伸变形的过程中发现，表现出几个制度：晶块的层间滑移发生在小变形，而应力诱导的晶块解聚-重结晶过程中发生的应变大于屈服应变。该转变点的应变与非晶缠结密度和晶块稳定性之间的相互作用有关。我们报告的实验证据，从真正的应力应变实验，支持这一论点。它强调，领带分子，连接相邻层，是相对于变形行为的重要性较小。
Being composed of crystalline lamellae and entangled amorphous polymeric chains in between, semicrystalline polymers always show a complicated deformation behavior under tensile deformation. In recent years, the process of tensile deformation was found to exhibit several regimes: intralamellar slipping of crystalline blocks occurs at small deformation whereas a stress-induced crystalline block disaggregation-recrystallization process occurs at a strain larger than the yield strain. The strain at this transition point is related to the interplay between the amorphous entanglement density and the stability of crystal blocks. We report experimental evidence from true stress-strain experiments that support this argument. It is emphasized that tie molecules, which connect adjacent lamellae, are of lesser importance with respect to the deformational behavior.