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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

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

Publisher: John Wiley and Sons
Year: 1990
Tongue: English
Weight: 921 KB
Volume: 39
Category: Article
ISSN: 0021-8995
DOI: 10.1002/app.1990.070390606

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✦ Synopsis

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) can be produced at high spinning rates (> 180 m/min) if rupturing of the entanglement network and oriented crystallization during spinning is suppressed. This could be accomplished by avoiding spinline stretching and applying low elongational deformation rates in the spinneret during spinning.

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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

✍ A. R. Postema; A. H. Luiten; A. J. Pennings 📂 Article 📅 1990 🏛 John Wiley and Sons 🌐 English ⚖ 785 KB

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 separat