Morphology and fracture of drawn crystalline polymers
Morphology and fracture of drawn crystalline polymers
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DOI：
10.1080/00222347308245795
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发表时间：
1973-10
期刊：
影响因子：
--
通讯作者：
A. Peterlin
中科院分区：
文献类型：
--
作者：
A. Peterlin
拉伸结晶聚合物、纤维和薄膜具有以细长微纤为基本单元的特征性纤维结构。源自起始材料的平行薄片的相同堆叠的高度取向的微原纤形成原纤，其通常在拉伸比上与相邻原纤略有不同。由于这种变化和微原纤维末端在原纤维外边界上的位置，这是断裂现象开始的强度降低的区域。微纤维的自由端是微纤维超晶格的点空位缺陷，其在施加的应力下，在样品失效之前很久就打开并形成微裂纹。径向裂纹扩展首先在点空位处破坏与微裂纹相邻的微原纤维，并且由于每个断裂的微原纤维的至少一个无定形层中的连接分子的断裂而产生大量自由基。纵向裂纹扩展是沿裂纹尖端方向进行的。
Abstract Drawn crystalline polymers, fibers and films, exhibit a characteristic fibrous structure with the long and narrow microfibril as the basic element. The highly oriented microfibrils originating from the same stack of parallel lamellae of the starting material form the fibril which, as a rule, differs a little in drawing ratio from adjacent fibrils. As a consequence of this variation and the location of the ends of microfibrils on the outer boundary of the fibril, this is the area of reduced strength where the fracture phenomena start. The free ends of microfibrils are point vacancy defects of the microfibrillar superlattice which, under applied stress, open and form microcracks long before the sample fails. The radial crack propagation first breaks the microfibrils adjacent to the microcrack at the point vacancy and produces a great many radicals as a consequence of the rupture of tie molecules in at least one amorphous layer of each broken microfibril. Longitudinal crack propagation proceeds alon...