Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2018 Dec 6;10(12):1353.
doi: 10.3390/polym10121353.

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

Bo Yang  1 , Rui Wang  2 , Hui-Ling Ma  3 , Xiaolu Li  4 , Harald Brünig  5 , Zhenfeng Dong  6 , Yue Qi  7 , Xiuqin Zhang  8
Affiliations

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

Bo Yang et al. Polymers (Basel). .

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.

PubMed Disclaimer

Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Temperature/draw procedure for in situ WAXS.
Figure 2
Figure 2
(a) WAXS intensity curve and (b) DSC heating curve of PLLA/PDLA blend as-spun fiber.
Figure 3
Figure 3
Selected 2D WAXS patterns of PLLA/PDLA fibers during heating and cooling. The stretching direction was vertical.
Figure 4
Figure 4
Selected 2D WAXS patterns of PLLA/PDLA-60-2 fiber during the heating process.
Figure 5
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
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
Figure 7
DSC heating curves of PLLA/PDLA-60-2 fibers annealed at various temperatures.
Figure 8
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).
See this image and copyright information in PMC

References

    1. Wang D.Y., Gohs U., Kang N.J., Leuteritz A., Boldt R., Wagenknecht U., Heinrich G. Method for simultaneously improving the thermal stability and mechanical properties of poly(lactic acid): Effect of high-energy electrons on the morphological, mechanical, and thermal properties of PLA/MMT nanocomposites. Langmuir. 2012;28:12601–12608. doi: 10.1021/la3025099. - DOI - PubMed
    1. Zhao X.M., Guerrero F.R., Llorca J., Wang D.Y. A new super-efficiently flame-retardant bioplastic-poly (lactic acid): Flammability, thermal decomposition behavior and tensile properties. ACS Sustain. Chem. Eng. 2016;4:201–209. doi: 10.1021/acssuschemeng.5b00980. - DOI
    1. Liu G.M., Zhang X.Q., Wang D.J. Tailoring crystallization: Towards high-performance poly(lactic acid) Adv. Mater. 2014;26:6905–6911. doi: 10.1002/adma.201305413. - DOI - PubMed
    1. Zhang X.Q., Jiang X.Z., Liu G.M., Liu Y.A., Wang R., Wang D.J. Effcet of orientation on crystallization behavior of poly(l-lactide acid)/poly(d-lactide acid) fibers. Acta Polym. Sin. 2014:1048–1055. doi: 10.11777/j.issn10003304. - DOI
    1. Rasal R.M., Janorkarc A.V., Hirt D.E. Poly(lactic acid) modifications. Prog. Polym. Sci. 2010;35:338–356. doi: 10.1016/j.progpolymsci.2009.12.003. - DOI

LinkOut - more resources