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Polymers 2018, 10(12), 1353; https://doi.org/10.3390/polym10121353

Structure Mediation and Properties of Poly(l-lactide)/Poly(d-lactide) Blend Fibers

1
Beijing Key Laboratory of Clothing Materials R & D and Assessment, Beijing Engineering Research Center of Textile Nanofiber, School of Materials Science & Engineering, Beijing Institute of Fashion Technology, Beijing 100029, China
2
Leibniz Institute of Polymer Research Dresden, Hohe Strasse 6, 01069 Dresden, Germany
*
Author to whom correspondence should be addressed.
Received: 13 November 2018 / Revised: 30 November 2018 / Accepted: 1 December 2018 / Published: 6 December 2018
(This article belongs to the Special Issue Multi-functional Polymer Composites and Structures)
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Abstract

Poly(l-lactic acid) (PLLA) and poly(d-lactic acid) (PDLA) blend as-spun fibers (50/50, wt.%) were prepared by melt spinning. Structure mediation under temperature and stress and properties of poly(l-lactic acid)/poly(d-lactic acid)(PLLA/PDLA) as-spun fibers were investigated by wide-angle X-ray scattering (WAXS) and differential scanning calorimetry (DSC). The results show that highly oriented stereocomplex (SC) crystals can be formed in PLLA/PDLA blend fibers drawn at 60 °C and annealed at 200 °C. However, at drawn temperature of 80 °C, only lower oriented SC crystals can be formed. For PLLA/PDLA blend fibers drawn twice at 60 °C (PLLA/PDLA-60-2), the crystallinity of SC crystals increases with annealing temperature in the range of 200 to 215 °C, while the degree of orientation decreases slightly. When the annealing temperature is 210 °C, the crystallinity and orientation of SC crystals in PLLA/PDLA-60-2 fibers reach 51% and −0.39, respectively. Moreover, PLLA/PDLA-60-2-210 fibers exhibit excellent heat-resistant property even at 200 °C. The results indicate that the oriented PLLA/PDLA blend fibers with high SC crystals content can be regulated in a short time. View Full-Text
Keywords: PLLA/PDLA fibers; crystallization; orientation; heat resistance PLLA/PDLA fibers; crystallization; orientation; heat resistance
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Yang, B.; Wang, R.; Ma, H.-L.; Li, X.; Brünig, H.; Dong, Z.; Qi, Y.; Zhang, X. Structure Mediation and Properties of Poly(l-lactide)/Poly(d-lactide) Blend Fibers. Polymers 2018, 10, 1353.

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