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Crystallization behavior of hyperbranched polyethylenes with different degree of branching

机译：不同支化度的超支化聚乙烯的结晶行为

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Hyperbranched polyethylenes (HBPEs) with different degree of branching (DB) and similar M-n are used to investigate the effect of branch structure on their crystallization behaviors. The crystal structure, isothermal, and non-isothermal crystallization kinetics of HBPEs are studied by X-ray diffraction and differential scanning calorimetry. The isothermal crystallization process is analyzed by the Avrami equation while the non-isothermal crystallization process is analyzed through the Ozawa and Mo methods. The XRD results indicate that the crystallization ability of HBPEs is weakened with the introduction of branch structure, i.e., the crystallinity of HBPEs decreases with the increase of DB, and even tends to zero. The kinetics results of isothermal and non-isothermal crystallization verify the peculiar effects of DB on the crystallization process of HBPEs. In detail, a little of branch structure can accelerate the crystallization process of HBPEs, however a large number of branch can inhibit it. (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44127.
机译：使用具有不同支化度（DB）和类似M-n的超支化聚乙烯（HBPE）来研究分支结构对其结晶行为的影响。通过X射线衍射和差示扫描量热法研究了HBPE的晶体结构，等温和非等温结晶动力学。等温结晶过程通过Avrami方程进行分析，非等温结晶过程通过Ozawa和Mo方法进行分析。 XRD结果表明，随着分支结构的引入，HBPE的结晶能力减弱，即HBPE的结晶度随DB的增加而降低，甚至趋于零。等温和非等温结晶的动力学结果证明了DB对HBPE结晶过程的特殊影响。详细地说，少量的分支结构可以加速HBPE的结晶过程，但是大量的分支可以抑制它。 （c）2016 Wiley Periodicals，Inc. J. Appl。 Polym。科学2016，133，44127。

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