Correlation of rheology-orientation-tensile property in isotactic polypropylene/organoclay nanocomposites

被引：34

作者：

Wang, Ke ^{[1
]}

Liang, Si ^{[1
]}

Zhao, Ping ^{[1
]}

Qu, Cheng ^{[1
]}

Tan, Hong ^{[1
]}

Du, Rongni ^{[1
]}

Zhang, Qin ^{[1
]}

Fu, Qiang ^{[1
]}

机构：

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

来源：

ACTA MATERIALIA | 2007年 / 55卷 / 09期

基金：

中国国家自然科学基金;

关键词：

rheology; orientation structure; correlation of structure-property; nanocomposite;

D O I：

10.1016/j.actamat.2007.01.020

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Three isotactic polypropylene(iPP)/organoclay nanocomposites with changed basal resin polarity and molecular weight but fixed clay content (10 wt.%) were prepared through melt-blending. To correlate the rheological properties with the orientation behavior and tensile property in injection-molded bars, the shear response and disorientation kinetics of those molten composites were investigated through large-amplitude oscillatory shear measurements and stress relaxation experiments, respectively. Then, dynamic packing injection molding was carried out to exert oscillatory shear on the molten composites during the solidification stage, for preparation of composites with high-level orientation. The orientated structures of injection-molded bars were inspected through 2-D wide-angle X-ray scattering analysis. Our results indicated for the first time that the rheological behaviors, such as alignment induced by large-amplitude shear and stress relaxation, would be the reliable references for estimating the orientation capability of nanocomposites in practical injection-molded processing. The rheological response to shear and the disorientation kinetics play crucial roles in determining the orientation and tensile strength of molded composites. (c) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：3143 / 3154

页数：12

共 43 条

[31] Shear orientation of viscoelastic polymer-clay solutions probed by flow birefringence and SANS [J].