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Melt spinning of isotactic polypropylene: Structure development and relationship to mechanical properties
Author(s) -
Nadella Hari P.,
Henson Helen M.,
Spruiell Joseph E.,
White James L.
Publication year - 1977
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.1977.070211115
Subject(s) - materials science , spinning , composite material , tacticity , melt spinning , ultimate tensile strength , paracrystalline , polymer , polypropylene , small angle x ray scattering , birefringence , tenacity (mineralogy) , polymerization , modulus , amorphous solid , crystallography , scattering , optics , chemistry , physics
An extensive experimental study of structure development during the melt spinning of polypropylene and is as‐spun polypropylene filaments is reported. Five polymers representing different molecular weights and polymerization methods were studied. WAXS, SAXS, and birefringence measurements were used to characterize the structure of the filaments. Spinning through air gives rise to monoclinic crystalline structures and spinning into cold water, the paracrystalline smectic form. Both crystalline and amorphous orientation factors were found to correlate with spinline stress for the different polymers studied. Mechanical properties of as‐spun fibers such as modulus, yield strength, tensile strength, and elongation to break also correlate with spinline stress.