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Structural studies on ethylene‐tetrafluoroethylene copolymer: III. Deformation mechanism of row‐crystallized film
Author(s) -
Tanigami Tetsuya,
Yamaura Kazuo,
Matsuzawa Shuji,
Ishikawa Masazumi,
Miyasaka Keizo
Publication year - 1986
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.760261907
Subject(s) - materials science , tetrafluoroethylene , mesophase , copolymer , composite material , deformation (meteorology) , deformation mechanism , small angle x ray scattering , phase transition , void (composites) , crystallography , scattering , liquid crystal , optics , microstructure , thermodynamics , polymer , physics , optoelectronics , chemistry
Wide‐angle X‐ray diffraction, small‐angle X‐ray scattering, density, stress‐strain, and dynamic viscoelastic measurements have been applied to a row‐crystallized ethylene‐tetrafluoroethylene copolymer film prepared by extrusion from the melt under extension to investigate the deformation mechanism upon stretching. It is shown that the deformation below the temperature of the phase transition (the order‐disorder transition from the crystal phase to the mesophase) ( T h ) is somewhat like that of “hard” elastic materials which is associated with micro‐void formation, and that the deformation above T h is rubber‐like, associated with bending of the lamellae. Gas permeability measurements have also been used for the stretched films to investigate the supermolecular structure, and the results support the above description.