Journal
JOURNAL OF THE TEXTILE INSTITUTE
Volume 98, Issue 3, Pages 227-236Publisher
TEXTILE INST
DOI: 10.1080/00405000701476179
Keywords
melt spin drawing; polylacticle; mechanical and thermal characteristics; X-ray diffraction
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Polylactide (PLA) filaments produced by melt spin-drawing in different conditions (draw ratio, temperature of the draw roll) have been studied to demonstrate the influence of the process conditions on the tensile properties of the PLA filaments. Draw ratio varies from 2 to 3.5 and temperature of the draw roll from 80 degrees C to 120 degrees C. The thermal characteristics have been investigated using modulated differential scanning calorimetry (MDSC) and crystallinity using X-Ray Diffraction (XRD). Shrinkage of PLA multifilaments depending on the processing conditions is also investigated. It is demonstrated that the temperature of the draw roll is essential to obtain PLA filaments with optimum properties. At 80 degrees C, the size of the lamellar crystals, measured using DRX, is not the highest. It is necessary to set the temperature of the draw roll at 110 degrees C to obtain thick lamellar crystals. So, in those conditions, the PLA filaments have their optimum mechanical properties.
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