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Continuous extrusion of high‐modulus semicrystalline polymers
Author(s) -
Bigg D. M.,
Epstein M. M.,
Fiorentino R. J.,
Smith E. G.
Publication year - 1981
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.1981.070260202
Subject(s) - crystallinity , materials science , extrusion , polymer , composite material , melt flow index , low density polyethylene , crystallization of polymers , polyethylene , modulus , high density polyethylene , extrusion moulding , copolymer
A process has been developed by which very high‐modulus semicrystalline polymer films can be extruded continuously from a melt. This is accomplished by controlled cooling of the melt in a two‐stage flow channel. A temperature gradient along the flow channel quenches the melt prior to an area reduction in which the polymer undergoes solid‐state orientation. Analysis of high‐density polyethylene tapes extruded by this process shows that they have properties similar to samples hydrostatically extruded at 120°C. Infrared analysis was used to determine both the degree of crystallinity and degree of orientation in these tapes as well as previously prepared hydrostatically extruded samples.