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High‐strength poly( L ‐lactide) fibers by a dry‐spinning/hot‐drawing process. I. Influence of the ambient temperature on the dry‐spinning process
Author(s) -
Postema A. R.,
Luiten A. H.,
Pennings A. J.
Publication year - 1990
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.1990.070390605
Subject(s) - die swell , materials science , spinning , ultimate tensile strength , composite material , protein filament , melt spinning , porosity , extrusion
In this paper the influence of the ambient temperature of the spinline during dry spinning of PLLA solutions has been discussed. Variation of this ambient temperature induced variation of the extrudate swell of the spinline, affected by the rate of solidification of the PLLA. By way of phase separation, porous filaments were achieved in which the morphology depended on the applied ambient temperature. Hot drawing of these filaments led to tensile strengths varying between 1.1 and 2.2 GPa. An optimal tensile strength of 2.2 GPa was achieved by hot drawing of a filament which was spun into a surrounding of 25°C.