TY - JOUR
T1 - Development of stress‐crystallized morphology during melt‐spinning of polypropylene fibers
AU - Fung, P. Y.‐F
AU - Orlando, E.
AU - Carr, Stephen Howard
PY - 1973/1/1
Y1 - 1973/1/1
N2 - Melt‐spinning of isotactic polypropylene was performed in an effort to assess how the flow field that exists within a filament affects final as‐spun fiber morphology. It was concluded that the molten filament deforms chiefly by elongational flow, with some small amount of shearing flow bearing localized near the filament periphery. The resulting crystal texture is mostly comprised of lamellae oriented perpendicular (chain direction parallel) to the fiber axis, but a minority population of crystallites whose orientation is orthogonal (chain direction perpendicular) to the primary population is also present in these fibers. Post‐drawing steps initially cause crystallites to rotate toward the axial direction, while the chains within them undergo intralamellar slip and become better oriented parallel to the fiber axis. At larger extensions, lamellar crystallites are pulled into microfibrillar units.
AB - Melt‐spinning of isotactic polypropylene was performed in an effort to assess how the flow field that exists within a filament affects final as‐spun fiber morphology. It was concluded that the molten filament deforms chiefly by elongational flow, with some small amount of shearing flow bearing localized near the filament periphery. The resulting crystal texture is mostly comprised of lamellae oriented perpendicular (chain direction parallel) to the fiber axis, but a minority population of crystallites whose orientation is orthogonal (chain direction perpendicular) to the primary population is also present in these fibers. Post‐drawing steps initially cause crystallites to rotate toward the axial direction, while the chains within them undergo intralamellar slip and become better oriented parallel to the fiber axis. At larger extensions, lamellar crystallites are pulled into microfibrillar units.
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U2 - 10.1002/pen.760130409
DO - 10.1002/pen.760130409
M3 - Article
AN - SCOPUS:84986980099
SN - 0032-3888
VL - 13
SP - 295
EP - 299
JO - Polymer Engineering and Science
JF - Polymer Engineering and Science
IS - 4
ER -