Morphology Change of Extrusion Molded Crystalline Polymer by Rolling Process

July 30, 2019

Title

Morphology Change of Extrusion Molded Crystalline Polymer by Rolling Process

Author

Takuya Murata, Jian Hui Qiu, Eiichi Sakai, Xue Li Wu, Makoto Kudo 

Year

2011

Journal

Advanced Materials Research

Abstract

In this work, the spring back, dimensional change, internal structure and morphology of extruded polypropylene were investigated in order to consider the rolling characteristic. It was found that the internal structure, molecular orientation and crystallinity were changed a little by high spring back under low reduction in thickness. Crystal structure was extended along the rolling direction with high reduction in thickness due to the increase of plastic deformation. As a result, molecular orientation increased and crystallinity decreased at over 30% of reduction in thickness. Crystalline structure of surface was similar to the center part in cross-section at 70% reduction in thickness, and molecular orientation was constant.

Instrument

IRT-7000

Keywords

FTIR microscopy, Rolling, Molecular orientation, Plastic deformation, Microstructure Polypropylene