. 2018 Dec 6;10(12):1353.

doi: 10.3390/polym10121353.

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

Bo Yang¹, Rui Wang², Hui-Ling Ma³, Xiaolu Li⁴, Harald Brünig⁵, Zhenfeng Dong⁶, Yue Qi⁷, Xiuqin Zhang⁸

Affiliations

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. 15510260661@163.com.
² 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. clywangrui@bift.edu.cn.
³ 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. huiling_1027@163.com.
⁴ 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. m13121937997_1@163.com.
⁵ Leibniz Institute of Polymer Research Dresden, Hohe Strasse 6, 01069 Dresden, Germany. bruenig@ipfdd.de.
⁶ 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. clydzf@bift.edu.cn.
⁷ 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. qiyuebift@126.com.
⁸ 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. clyzxq@bift.edu.cn.

PMID: 30961279
PMCID: PMC6401892
DOI: 10.3390/polym10121353

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

Bo Yang et al. Polymers (Basel). 2018.

. 2018 Dec 6;10(12):1353.

doi: 10.3390/polym10121353.

Authors

Bo Yang¹, Rui Wang², Hui-Ling Ma³, Xiaolu Li⁴, Harald Brünig⁵, Zhenfeng Dong⁶, Yue Qi⁷, Xiuqin Zhang⁸

Affiliations

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. 15510260661@163.com.
² 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. clywangrui@bift.edu.cn.
³ 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. huiling_1027@163.com.
⁴ 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. m13121937997_1@163.com.
⁵ Leibniz Institute of Polymer Research Dresden, Hohe Strasse 6, 01069 Dresden, Germany. bruenig@ipfdd.de.
⁶ 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. clydzf@bift.edu.cn.
⁷ 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. qiyuebift@126.com.
⁸ 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. clyzxq@bift.edu.cn.

PMID: 30961279
PMCID: PMC6401892
DOI: 10.3390/polym10121353

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.

Keywords: PLLA/PDLA fibers; crystallization; heat resistance; orientation.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

**Figure 1**
Temperature/draw procedure for in situ WAXS.

**Figure 2**
(a) WAXS intensity curve and (b) DSC heating curve of PLLA/PDLA blend as-spun fiber.

**Figure 3**
Selected 2D WAXS patterns of PLLA/PDLA fibers during heating and cooling. The stretching direction was vertical.

**Figure 4**
Selected 2D WAXS patterns of PLLA/PDLA-60-2 fiber during the heating process.

**Figure 5**
Selected 2D WAXS patterns of PLLA/PDLA-60-2 fibers during heating to 210 °C (a) and 215 °C (b), and the following cooling process.

**Figure 6**
Crystallinity calculated from the WAXS results shown in Figure 3 and Figure 5 for PLLA/PDLA-60-2 fibers after cooled from different temperatures.

**Figure 7**
DSC heating curves of PLLA/PDLA-60-2 fibers annealed at various temperatures.

**Figure 8**
Appearance of PLA fibers. (1) PLLA/PDLA-60-2-210 fibers (original length 1.1 cm), (2) PLLA/PDLA-60-2-210 fibers (heated at different temperatures), (3) PLLA-130 fibers (heated at different temperatures), (4) PLLA-130 fibers (original length 4.3 cm).

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

Affiliations

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

Authors

Affiliations

Abstract

Conflict of interest statement

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