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Effects of nucleation and stereocomplex formation of poly(lactic acid)

  • Yottha Srithep EMAIL logo , Dutchanee Pholharn , Lih-Sheng Turng , Onpreeya Veang-in and John Morris
Published/Copyright: December 7, 2015
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Journal of Polymer Engineering
From the journal Journal of Polymer Engineering Volume 36 Issue 7

Abstract

The effects of poly(d-lactide) (PDLA), nanoclay, talc, and stereocomplex formation were investigated in blends where these materials were added as a minor phase in a major phase of poly(l-lactide) (PLLA). Blends containing 2% PDLA, nanoclay, or talc as nucleants were prepared via melt blending and showed a strong increase in the crystallization rate as revealed by isothermal and nonisothermal crystallization measurements. The blending of 2% PDLA with PLLA led to the highest crystallization rate. Moreover, a stereocomplex formation was observed in a PLLA/PDLA blend (50:50). Wide-angle X-ray diffraction and differential scanning calorimetry verified that complete stereocomplex crystallites that do not form homocrystallites can be achieved. Compared with pure PLLA, the stereocomplex had a higher melting temperature and a higher crystallization temperature, by more than 50°C and 25°C, respectively.

Keywords: crystallization; nucleation; poly(lactic acid); stereocomplex
Corresponding author: Yottha Srithep, Manufacturing and Materials Research Unit, Faculty of Engineering, Department of Manufacturing Engineering, Mahasarakham University, Mahasarakham 44150, Thailand, e-mail:

Acknowledgments

The financial support of the National Research Council of Thailand (NRCT), Faculty of Engineering, Mahasarakham University, and Mahasarakham University Development Fund are gratefully acknowledged. We thank Dr. Yodthong Baimark of Mahasarakham University for preparing the PLLA and PDLA samples.

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Received: 2015-8-14
Accepted: 2015-9-25
Published Online: 2015-12-7
Published in Print: 2016-9-1

©2016 Walter de Gruyter GmbH, Berlin/Boston

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https://doi.org/10.1515/polyeng-2015-0357
Keywords for this article
crystallization; nucleation; poly(lactic acid); stereocomplex

Articles in the same Issue

  1. Frontmatter
  2. Original articles
  3. Prolonged protein immobilization of biosensor by chemically cross-linked glutaraldehyde on mixed cellulose membrane
  4. Hybrid biocomposites from agricultural residues: mechanical, water absorption and tribological behaviors
  5. Effects of nucleation and stereocomplex formation of poly(lactic acid)
  6. Preparation and characterization of polystyrene-MgAl layered double hydroxide nanocomposites using bulk polymerization
  7. Fracture behavior and deformation mechanisms of polypropylene/ethylene-propylene-diene blends
  8. Effect of mechanical properties of metal powder-filled hybrid moulded products
  9. Ablation and thermo-mechanical tailoring of EPDM rubber using carbon fibers
  10. Effects of mechanical strength, working temperature and wax lubricant on tribological behavior of polystyrene
  11. Temperature rise in a verging annular die
  12. Numerical investigation of the temperature influence on the melt predistribution in a spiral mandrel die with different polyolefins
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