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Property Enhancement of Polylactide Monofilaments by Cold-Drawing Process and Solvent Infusion


Paper Type 
Contributed Paper
Title 
Property Enhancement of Polylactide Monofilaments by Cold-Drawing Process and Solvent Infusion
Author 
Jirawan Jindakaew, Chalita Ratanatawanate, Takeshi Kikutani, and Pakorn Opaprakasit*
Email 
pakorn@siit.tu.ac.th
Abstract:
Post treatments of polymeric products after fabrication, especially improvements of their
crystallinity, are commonly applied to further enhance properties of the materials. In this study, a
cold-drawing process in various environments is developed for poly(L-lactide) (PLLA) monofilaments,
whose solvent-infusion mechanism is examined. Multiple necking behavior was observed when the
filaments were drawn in water and ethanol, compared to a single-neck deformation when the experiment
was conducted in air. The number of necks was also dependent on the drawing media conditions,
in which the number of necks decreased with an increase in the draw ratio (DR). The number of
necks of the filaments drawn in water and ethanol increased with a further increase in the drawing
speed. The drawing treatments in ethanol lead to a decrease in the yield and drawing stresses. and an
increase in the natural draw ratio (NDR) of the monofilaments. The results also indicate that ethanol
is effectively infused into the PLLA filaments, leading to further chain arrangements. The process
has high potential for promoting the crystallization of filaments in cold drawing conditions, leading
to enhancement in the mechanical properties.
Start & End Page 
323 - 331
Received Date 
2020-09-18
Revised Date 
Accepted Date 
2021-01-27
Full Text 
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Correspondence & Author Name 
Pakorn Opaprakasit,
Keyword 
polylactide, solvent infusion, cold drawing, post treatment, induced crystallization
Volume 
Vol.48 No.2 (March 2021)
View:183 Download:144

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