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Preparation of high‐modulus and high‐strength isotactic polypropylene fiber by zone‐annealing method
Author(s) -
Kunugi Toshio,
Ito Taihei,
Hashimoto Minoru,
Ooishi Masashi
Publication year - 1983
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.1983.070280115
Subject(s) - tacticity , materials science , crystallinity , composite material , annealing (glass) , modulus , ultimate tensile strength , amorphous solid , dynamic mechanical analysis , dynamic modulus , young's modulus , viscoelasticity , fiber , polymer , crystallography , polymerization , chemistry
The zone‐annealing method was utilized to prepare a high‐modulus and high‐strength fiber from isotactic polypropylene. The dynamic storage modulus at room temperature of the fiber obtained reached 21 times; 10 10 dyn/cm 2 , which corresponded to 51% of the crystal modulus along the molecular chains, 41.2 × 10 10 dyn/cm 2 . The relationships between mechanical properties and superstructure were investigated based on results of measurements of orientation, crystallinity, tensile properties, and dynamic viscoelasticity. It was found that the excellent mechanical properties were directly attributed to the large number of tie molecules and to the high orientation of the amorphous chains. Further, the characteristics of this method were discussed compared with the results obtained by other investigators.