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On the physical behavior of isotactic polypropylene fibers extruded at different draw‐down ratios: II. Structure and properties
Author(s) -
ElDessouky Hassan M.,
Mahmoudi Mohammad R.,
Lawrence Carl A.,
Lewis Eric L.V.,
Voice Alison M.,
Ward Ian M.
Publication year - 2010
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.21533
Subject(s) - materials science , tenacity (mineralogy) , tacticity , composite material , crystallinity , birefringence , ultimate tensile strength , polypropylene , spinning , modulus , fiber , differential scanning calorimetry , synthetic fiber , polymer , optics , thermodynamics , physics , polymerization
Microinterferometry (MIF), wide‐angle X‐ray scattering (WAXS), differential scanning calorimetry (DSC), and an Instron tensile tester (ITT) were used to determine the correlation between optical and structural properties of polypropylene (PP) fibers. For the purpose of the study a set of as‐spun isotactic PP fibers were extruded by melt spinning at different draw‐down ratios (DDR). The birefringence (Δ n ), degrees of orientation, degree of crystallinity (χ), Young's modulus ( E e ), and tenacity (τ) were determined for PP fibers at the different DDR. An equiangular orientation of PP fibers at particular DDR was predicted experimentally, and the transverse modulus ( E t ) was estimated for the tested fibers. Empirical formulae were developed for correlating the fiber birefringence with some of the studied structural properties of PP fibers. POLYM. ENG. SCI., 2010. © 2009 Society of Plastics Engineers