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Cavitation in Isotactic Polypropylene at Large Strains during Tensile Deformation at Elevated Temperatures
Macromolecules ( IF 5.1 ) Pub Date : 2015-08-13 00:00:00 , DOI: 10.1021/acs.macromol.5b00818 Ying Lu 1 , Yaotao Wang 1 , Ran Chen 1 , Jiayi Zhao 1 , Zhiyong Jiang 1 , Yongfeng Men 1
Macromolecules ( IF 5.1 ) Pub Date : 2015-08-13 00:00:00 , DOI: 10.1021/acs.macromol.5b00818 Ying Lu 1 , Yaotao Wang 1 , Ran Chen 1 , Jiayi Zhao 1 , Zhiyong Jiang 1 , Yongfeng Men 1
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Two quenched isotactic polypropylene samples with different molecular weight were used to explore the sudden stress whitening activated at large strains during stretching at elevated temperatures via the ultrasmall-angle X-ray scattering technique. This kind of whitening was confirmed to be caused by the creation of cavities within the highly oriented samples. The critical strain for initiating the stress whitening increases with the increase of stretching temperature and molecular weight whereas the critical stress for the stress whitening depends only on molecular weight irrespective of stretching temperature. Thus, this peculiar stress whitening behavior under large strain deformation can be understood as a consequence of disentanglement of the highly oriented amorphous network initiated by the breaking of interfibrillar tie chains. During large strain deformation, two independent processes can occur. Besides the disentanglement induced cavitation, the stacked lamellar structure within microfibrils can be destroyed in the high molecular weight sample. In such case, the critical stress for lamellae destruction is lower than that of breaking of interfibrillar tie chains.
中文翻译：
高温拉伸变形过程中大应变全同立构聚丙烯的空化
使用两个不同分子量的淬火等规聚丙烯样品，通过超小角度X射线散射技术探索了在高温拉伸过程中大应变下激活的突然应力变白。事实证明，这种增白是由高度取向的样品中产生的空洞引起的。引发应力变白的临界应变随拉伸温度和分子量的增加而增加，而应力变白的临界应力仅取决于分子量，而与拉伸温度无关。因此，在大应变变形下这种特殊的应力变白行为可以理解为是由于纤维间束缚链断裂而引发的高取向非晶态网络解缠结的结果。在大应变变形期间，可能会发生两个独立的过程。除了解开引起的空化作用外，在高分子量样品中，微纤维内的堆叠层状结构也可能被破坏。在这种情况下，破坏片层的临界应力低于破坏纤维间束缚链的临界应力。
更新日期：2015-08-13
中文翻译：
高温拉伸变形过程中大应变全同立构聚丙烯的空化
使用两个不同分子量的淬火等规聚丙烯样品，通过超小角度X射线散射技术探索了在高温拉伸过程中大应变下激活的突然应力变白。事实证明，这种增白是由高度取向的样品中产生的空洞引起的。引发应力变白的临界应变随拉伸温度和分子量的增加而增加，而应力变白的临界应力仅取决于分子量，而与拉伸温度无关。因此，在大应变变形下这种特殊的应力变白行为可以理解为是由于纤维间束缚链断裂而引发的高取向非晶态网络解缠结的结果。在大应变变形期间，可能会发生两个独立的过程。除了解开引起的空化作用外，在高分子量样品中，微纤维内的堆叠层状结构也可能被破坏。在这种情况下，破坏片层的临界应力低于破坏纤维间束缚链的临界应力。
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