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Molecular orientation behavior of mesomorphic isotactic polypropylene under uniaxial and biaxial deformation
Author(s) -
Yoshida Shingo,
Ishii Kazuomi,
Kawamura Takanobu,
Nitta KohHei
Publication year - 2011
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.21787
Subject(s) - materials science , tacticity , necking , birefringence , composite material , deformation (meteorology) , orientation (vector space) , polypropylene , yield (engineering) , optics , polymer , geometry , polymerization , physics , mathematics
Abstract The molecular orientation behavior of mesomorphic isotactic polypropylene films under biaxial extension was investigated at room temperature. The birefringence was measured not only for drawn films but also simultaneously with biaxial stresses. It was found that there exists a yield point at which the neck is initiated on the biaxial deformed films and necking occurred and propagated in only one stretching direction, resulting in mosaic structures consisting of necked blocks. POLYM. ENG. SCI., 2011. © 2010 Society of Plastics Engineers