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首页> 外文期刊>Journal of Applied Polymer Science >Studies on the intermolecular structural heterogeneity of a propylene-ethylene random copolymer using preparative temperature rising elution fractionation
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Studies on the intermolecular structural heterogeneity of a propylene-ethylene random copolymer using preparative temperature rising elution fractionation

机译：制备型升温升温分馏法研究丙烯-乙烯无规共聚物的分子间结构异质性

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摘要

The intermolecular structural heterogeneity of a propylene-ethylene random copolymer was studied by preparative temperature rising elution fractionation combined with GPC, C-13-NMR, differential scanning calorimetry, and wide-angle X-ray diffraction analysis of the obtained fractions. The isotacticity of fractions increased with increasing elution temperature, and the ethylene content decreased monotonously. Fitting of the obtained comonomer triad sequences by Bernoullian and first-order Markovian statistical models indicated that lower isospecific active sites are more active toward ethylene. The isolated ethylene unit disrupted the crystallizable isotactic sequence and lowered the crystallizability of the polypropylene chain. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 232-239, 2005.
机译：丙烯-乙烯无规共聚物的分子间结构异质性是通过制备升温升温分馏法与GPC，C-13-NMR，差示扫描量热法和所得馏分的广角X射线衍射分析相结合进行研究的。馏分的全同立构规整度随洗脱温度的升高而增加，乙烯含量单调降低。伯努利安和一阶马尔可夫统计模型对获得的共聚单体三单元组序列的拟合表明，较低的同种异型活性位点对乙烯更具活性。分离的乙烯单元破坏了可结晶的等规序列，并降低了聚丙烯链的可结晶性。 ＆复制; 2005 Wiley Periodicals，Inc. J Appl Polym Sci 97：232-239，2005。

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