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Orientation in cold‐rolled polypropylene
Author(s) -
Wilchinsky Zigmond W.
Publication year - 1963
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1963.070070311
Subject(s) - materials science , orientation (vector space) , necking , polypropylene , deformation (meteorology) , composite material , plane (geometry) , inclination angle , geometry , crystallography , optics , physics , chemistry , mathematics
Sheets of isotactic polypropylene were prepared to have initially random orientation and were subsequently rolled at temperatures below the crystalline melting point. Their crystal orientation was investigated. The orientation of the c axis (fiber axis) was determined from pole figure data obtained by x‐ray diffraction. It was found that rolling produced orientation of the c axis in two preferred directions in the plane defined by the rolling direction and the normal to the sheet. These two directions made equal angles of inclination with the rolling direction. With increased severity of rolling the component of the orientation vector in the rolling direction increased and the angles between the preferred c axis orientation and the rolling direction decreased. Increasing the temperature reduced the angle of inclination of the preferred c axis orientation. This double c axis orientation was not observed in extruded film. An explanation of the c axis orientation in cold‐rolled polypropylene is offered on the basis of local necking down within the sample during the deformation.