文献类型：期刊文献

英文题名：Effects of Processing Route on Morphology and Mechanical Behavior of Polypropylene in Equal Channel Angular Extrusion

作者：Wang, Tinglan[1];Tang, Songchao[1];Chen, Jianding[1]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Shanghai Key Lab Adv Polymer Mat,Key Lab Ultrafin, Shanghai 200237, Peoples R China

年份：2011

卷号：122

期号：3

起止页码：2146

外文期刊名：JOURNAL OF APPLIED POLYMER SCIENCE

收录：;EI(收录号：20113014169583);WOS:【SCI-EXPANDED(收录号:WOS:000293849200079)】；

基金：Contract grant sponsor: Shanghai Leading Academic Discipline Project; contract grant number: B502.Contract grant sponsor: Shanghai Key Laboratory Project; contract grant number: 08DZ2230500.

语种：英文

外文关键词：isotactic polypropylene; equal channel angular extrusion; processing route; orientation

摘要：Changes of morphology and mechanical behavior of isotactic polypropylene (iPP) due to equal channel angular extrusion (ECAE) were investigated. The iPP specimens were processed for up to two passes in the same direction (route A), with the specimens rotate 180 degrees around loading axis after the previous pass (route C). The macroscopic observation showed that high level of shear strain is introduced in iPP extruded twice in route A. Reflected optical microscopy revealed that the original spherulites are elongated into ellipsoidal shape along the shear direction in route A, and the recovery of the spherulitic shape occurred in iPP extruded in route C. X-ray diffraction results and the dynamic mechanical analysis showed that the crystalline and amorphous phase are prone to orientation more favorably via route A than route C. The increase of the dynamic storage modulus (E') indicated that iPP becomes stiffer than other samples when extruded twice in route A. Izod impact testing results demonstrated that the ECAE-deformed spherulites influence the crack propagation direction. The impact strength of iPP is greatly improved to 490.5 J/m after processed twice in route A, 10 times of that of un-deformed reference sample. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 122: 2146-2158, 2011