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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

✍ Scribed by A. R. Postema; A. H. Luiten; A. J. Pennings

Publisher: John Wiley and Sons
Year: 1990
Tongue: English
Weight: 785 KB
Volume: 39
Category: Article
ISSN: 0021-8995
DOI: 10.1002/app.1990.070390605

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✦ Synopsis

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.

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High-strength poly(L-lactide) fibers by a dry-spinning/hot-drawing process. II. Influence of the extrusion speed and winding speed on the dry-spinning process

✍ A. R. Postema; A. H. Luiten; H. Oostra; A. J. Pennings 📂 Article 📅 1990 🏛 John Wiley and Sons 🌐 English ⚖ 921 KB

This paper is concerned with the influences of the extrusion speed and the winding speed during dry spinning of 4 w t '% solutions of poly(L-lactide) (PLLA) in mixtures of chloroform and toluene, on the ultimate fiber tenacities after hot drawing. It was found that high-strength PLLA fibers (1.5 GPa