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Mechanical properties and structure of the zone-drawn poly(L-lactic acid) fibers

✍ Scribed by Hidenori Okuzaki; Isamu Kubota; Toshio Kunugi

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
148 KB
Volume
37
Category
Article
ISSN
0887-6266

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✦ Synopsis

The zone-drawing (ZD) method was applied three times to the melt-spun poly(L-lactic acid) (PLLA) fibers of low molecular weight (M v ϭ 13,100) at different temperatures under various tensions. The mechanical properties and superstructure of the ZD fibers were investigated. The resulting ZD-3 fiber had a draw ratio of 10.5, birefringence of 37.31 ϫ 10 Ϫ3 , and crystallinity of 37%, while an orientation factor of crystallites remarkably increased to 0.985 by the ZD-1. The Young's modulus and tensile strength of the ZD-3 fiber respectively attained 9.1 GPa and 275 MPa, and the dynamic storage modulus was 10.4 GPa at room temperature.

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