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首页> 外文期刊>Journal of Applied Polymer Science >Investigation of short range ordering in PES/PEES alternative copolymer by means of radial distribution functions derived from X-ray diffraction
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Investigation of short range ordering in PES/PEES alternative copolymer by means of radial distribution functions derived from X-ray diffraction

机译：通过X射线衍射得出的径向分布函数研究PES / PEES替代共聚物中的短程有序

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摘要

Two samples of poly(ether sulfone)/poly (ether ether sulfone) alternative copolymer, showing marked differences in tensile behavior due to different thermal histories, were investigated by radial distribution function (RDF) methods. The RDF patterns were virtually identical and showed that the short range order (0-14 angstrom) in the samples had been essentially unaffected by the annealing procedures. Two intramolecular distances in the polymer repeat unit were successfully resolved in the RDF pattern. However, there were only suggestions of broad peaks at r = 5.5 angstrom and r = 11 angstrom attributable to intermolecular ordering, indicating that little intermolecular ordering had occurred in either sample. The appearance of two peaks at similar to 5 angstrom periodic suggested the existence of more or less parallel chain segments in the copolymers. Explanations of the different tensile properties of the two samples which assume a significant short range reordering on annealing are thus ruled out on the available evidence. A more highly annealed sample was examined to assess the sensitivity of the RDF method to short range intermolecular ordering. The RDF plot of this sample showed a marked periodicity peaking at intervals of similar to 5 angstrom which was attributed to intermolecular ordering, thus confirming the above conclusion. (c) 2007 Wiley Periodicals, Inc.
机译：通过径向分布函数（RDF）方法研究了两个聚醚醚砜/聚醚醚砜替代共聚物样品，这些样品由于不同的热历史而显示出明显的拉伸性能差异。 RDF图案实际上是相同的，表明样品中的短程有序（0-14埃）基本上不受退火程序的影响。聚合物重复单元中的两个分子内距离已成功解析为RDF模式。但是，只有分子间有序在r = 5.5埃和r = 11埃处出现宽峰的建议，表明在这两个样品中几乎没有发生分子间有序。在类似于5埃周期的两个峰的出现表明共聚物中存在或多或少的平行链链段。因此，在现有证据中排除了对两种样品的不同拉伸性能的解释，这些拉伸性能假定在退火后会发生明显的短程重排。检查了退火程度更高的样品，以评估RDF方法对短程分子间有序性的敏感性。该样品的RDF图显示出明显的周期性峰，其间隔类似于5埃，这归因于分子间的有序性，因此证实了上述结论。 （c）2007年Wiley Periodicals，Inc.

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