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Microstructural Origin of the Double Yield Points of the Metallocene Linear Low-Density Polyethylene (mLLDPE) Precursor Film under Uniaxial Tensile Deformation

机译:单轴拉伸变形下茂金属线性低密度聚乙烯(MLLDPE)前体膜的双屈服点的微观结构来源

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摘要

The microstructural origin of the double yield points of metallocene linear low-density polyethylene (mLLDPE) precursor films has been studied with the assistance of the synchrotron radiation small- and wide-angle X-ray scattering (SAXS/WAXS). It has been shown that the microstructural origin of the double yield points is highly related to the initial orientation of the original precursor film. For less oriented mLLDPE precursor films, the rearrangement of lamellae and the appearance of the monoclinic phase are the microstructural origins of the first yield point. In comparison, for the highly-oriented mLLDPE precursor film, only the orthorhombic-monoclinic phase transition appears at the first yield point. The melting-recrystallization and the formation of the fibrillary structure happen beyond the second yield point for all studied mLLDPE precursor films. Finally, the detailed microstructural evolution roadmaps of mLLDPE precursor films under uniaxial tensile deformation have been established, which might serve as a guide for processing high-performance polymer films by post-stretching.
机译:已经通过同步辐射辐射小和广角X射线散射(SAXS / WAX),研究了茂金属线性低密度聚乙烯(MLLDPE)前体膜的双屈服点的微观结构来源。已经表明,双屈服点的微观结构起源与原始前体膜的初始取向高。对于较少定向的MLLDPE前体膜,薄片的重排和单斜相的外观是第一屈服点的微观结构起源。相比,对于高度取向的MLLDPE前体膜,仅在第一屈服点出现正交 - 单斜相转变。熔融再结晶和纤维结构的形成发生超出所有研究的MLLDPE前体膜的第二屈服点。最后,已经建立了单轴拉伸变形下MLLDPE前体膜的详细微观结构演化路线,其可以作为通过后拉伸加工高性能聚合物膜的指导。

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