Study of the melting behaviour of ultra-high modulus linear polyethylene using synchrotron radiation
Study of the melting behaviour of ultra-high modulus linear polyethylene using synchrotron radiation
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DOI：
10.1016/0032-3861(88)90163-2
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发表时间：
1988-11
期刊：
影响因子：
4.6
通讯作者：
J. Clements;H. G. Zachmann;I. Ward
中科院分区：
文献类型：
--
作者：
J. Clements;H. G. Zachmann;I. Ward
用同步辐射研究了高拉伸线性聚乙烯的熔融行为。以前使用差示扫描量热仪进行的研究表明，所有样品都存在过热现象，即随着升温速度的增加，熔化温度升高。为了了解这些材料过热的原因，在观察广角X射线散射的同时，进行了两种类型的熔化实验。首先，在熔融范围内以不同的恒定速率加热样品。在第二种方法中，将样品快速加热到固定温度，以研究等温条件下的熔融。前者的结果证实了过热的存在，而后者的结果表明不同温度下的熔化时间与观察到的过热相对应。发现了部分熔化的存在，特别是在高拉伸比时，表明存在具有显著程度的晶体连续性的形态。这一结果与其他对这些材料结构的研究结果完全一致。
A study has been made of the melting behaviour of highly drawn linear polyethylene using synchrotron radiation. Previous investigations using differential scanning calorimetry have shown that superheating, an increase in melting temperature with increasing heating rate, was observed in all samples. In order to understand the causes of superheating in these materials two types of melting experiments were performed while observing the wide-angle X-ray scattering. In the first, samples were heated at different constant rates through the melting range. In the second, samples were heated rapidly to a fixed temperature in order to study melting under isothermal conditions. The results of the former have confirmed the presence of superheating while those of the latter indicate different melting times at different temperatures corresponding to the superheating observed. The presence of partial melting, particularly at high draw ratios, has been found indicating the presence of a morphology with a significant degree of crystal continuity. This result is entirely consistent with the results of other investigations into the structure of these materials.