Unusual hierarchical structures of mini-injection molded isotactic polypropylene/ultrahigh molecular weight polyethylene blends

被引：18

作者：

An, Yuan ^{[1
]}

Bao, Rui-Ying ^{[1
]}

Liu, Zheng-Ying ^{[1
]}

Wu, Xiao-Jun ^{[1
]}

Yang, Wei ^{[1
]}

Xie, Bang-Hu ^{[1
]}

Yang, Ming-Bo ^{[1
]}

机构：

[1] Sichuan Univ, Coll Polymer Sci & Engn, State Key Lab Polymer Mat Engn, Chengdu 610065, Sichuan, Peoples R China

来源：

EUROPEAN POLYMER JOURNAL | 2013年 / 49卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Isotactic polypropylene/ultrahigh molecular; weight polyethylene blends; Hierarchical structure; Hydrodynamic interaction; Melt adsorption; lnterdiffusion; SHEAR-INDUCED CRYSTALLIZATION; NUCLEATED CYLINDRITIC CRYSTALLIZATION; FIBER-REINFORCED POLYPROPYLENE; HIGH-DENSITY POLYETHYLENE; MECHANICAL-PROPERTIES; SUPERMOLECULAR STRUCTURE; PRECURSOR STRUCTURES; MELT; MORPHOLOGIES; BEHAVIOR;

D O I：

10.1016/j.eurpolymj.2012.10.020

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The introduction of ultrahigh molecular weight polyethylene (UHMWPE) leads to very rich and unusual hierarchical crystalline morphologies in mini-injection molded isotactic polypropylene (iPP) based materials and the role of UHMWPE in the formation of the hierarchical structures has been studied. The hierarchical structures, including the shish-kebab-like structure, beta-cylindrite, beta-spherulite and alpha-spherulite, in the injection molded samples were characterized by wide-angle X-ray diffraction, scanning electron microscopy and differential scanning calorimetry. Results indicated that the content of crystal modifications and the distribution of the crystal morphologies formed are closely related to the density and arrangement of the row nuclei formed, which can be tuned by the content of UHMWPE and its dispersion in the matrix. The density and arrangement of the row nuclei are determined by the hydrodynamic interaction, melt adsorption, and interdiffusion between iPP and UHMWPE. With the distance between the row nuclei increasing, the corresponding dominating crystals are shish-kebab-like structure, beta-cylindrite, beta-spherulite and alpha-spherulite in sequence. (c) 2012 Elsevier Ltd. All rights reserved.

引用

页码：538 / 548

页数：11

共 52 条

[41] Modification of polypropylene by melt vibration blending with ultra high molecular weight polyethylene [J].