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Two‐stage drawing of poly(ethylene 2,6‐naphthalate)
Author(s) -
Ito Masayoshi,
Honda Katsumi,
Kanamoto Tetsuo
Publication year - 1992
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.1992.070460609
Subject(s) - slippage , crystallinity , materials science , amorphous solid , ultimate tensile strength , composite material , modulus , ethylene , polyester , polymer , crystallography , chemistry , organic chemistry , catalysis
Initially amorphous and semicrystalline films of poly(ethylene 2,6‐naphthalate) with different molecular weights were drawn by two‐stage drawing, that is, coextrusion at low temperatures (25–160°C) followed by tensile drawing at high temperatures (200–245°C). Both films could be drawn up to a draw ratio of 8–10 by this method under controlled conditions. The tensile modulus and strength of drawn samples were greatly affected by the draw temperature for the first stage, predrawn morphology, and molecular weight. The remarkable effects of these variables on the tensile properties are closely related to the difference in the resultant amorphous chain orientation of the samples, reflecting the disentanglements and chain slippage during drawing, and the dissipation of chain orientation after processing.