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On the origin of the multiple melting observed after isothermal crystallization of homogeneous ethylene/1-octene copolymers

机译：关于均相乙烯/ 1-辛烯共聚物等温结晶后观察到的多次熔融的起源

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摘要

The complex melting behavior of homogeneous ethylene/1-oc-tene copolymer isothermally crystallized at 93deg C was studied by means of DSC and time resolved SAXS and WAXS.Two melting peaks,observed in DSC during heating after the isothermal crystallization,point to the existence of two populations of crystals of different thermal stability.This hypothesis is confronted and supported with the results of SAXS and WAXS investigations.Two populations of crystals are created due to segregation of more branched(of higher 1-octene content)parts of copolymer chains into separate areas in the melt.More stable crystals,melting at higher temperatures,are formed at the beginning of crystallization.Less stable ones originate later in the areas enriched with 1-octene,segregated away from the growth front during primary crystallization.No evidences on the existence of isolated fringed micel-lar crystallites were found.The crystals of each group are of lamellar type.All lamellae show the same thickness.The difference in their thermal stability,as revealed by two melting peaks in DSC curves,most probably results from different state of their basal surfaces.
机译：通过DSC和时间分辨SAXS和WAXS研究了在93℃下等温结晶的均相乙烯/ 1-辛烯共聚物的复杂熔融行为。等温结晶后加热期间在DSC中观察到两个熔融峰，表明存在SAXS和WAXS研究的结果正视和支持了这一假设.SAXS和WAXS研究的结果支持并支持了这一假设。由于共聚物链中更多支链的（具有更高1-辛烯含量的）部分被隔离而形成了两个晶体。在结晶开始时会形成更稳定的晶体，并在较高的温度下熔融。在结晶开始时会形成更稳定的晶体。随后，较少稳定的晶体起源于富含1-辛烯的区域，这些区域在初次结晶过程中与生长前沿分离开来。发现存在分离的条纹状胶束状微晶体，每组晶体均为层状类型，所有薄片均具有相同的厚度DSC曲线中的两个熔融峰揭示了它们的热稳定性差异，这很可能是由于它们的基础表面状态不同所致。

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