Advertisement

DSC and SWAXS Studies on the Effects of Silk Nanocrystals on Crystallization of Poly(l-Lactic Acid)

  • Amit Kumar Pandey
  • Pham Thi Ngoc Diep
  • Rahul Patwa
  • Vimal Katiyar
  • Sono Sasaki
  • Shinichi SakuraiEmail author
Chapter
  • 40 Downloads
Part of the Materials Horizons: From Nature to Nanomaterials book series (MHFNN)

Abstract

Poly (l-lactic acid) (PLLA) is one of the most frequently used biobased polyesters due to its favorable mechanical properties. However, some properties such as slow crystallization rate and low crystallinity restrict its commercial uses. In order to overcome these limitations, organic nanofillers are incorporated into the PLLA matrix. Herein, we report the use of silk nanocrystal (SNC) as a solid-state nucleation agent, which has been prepared in the laboratory from the wastes of the muga silk cocoon. PLLA/SNC composites with 1.0 wt% loadings of SNC have been prepared by solution casting with dichloromethane as a cast solvent. Isothermal crystallization kinetics at 110 °C has been studied by the differential scanning calorimetry (DSC) and small- and wide-angle X-ray scattering (SWAXS) upon quenching from melt (200 °C for 5 min). As a result, it is found that loading SNC with 1.0 wt% caused the reduction of the induction period, the acceleration of crystallization, the increase of the final value of the degree of crystallinity, and the acceleration of lamellar thickening. These experimental results can be explained by the fact that the regular folding of the polymer chains is attained by the loading of SNC.

Keywords

Poly (l-lactic acid) Silk nanocrystal Small- and wide-angle X-ray scattering Crystallization 

References

  1. 1.
    Saeidlou S, Huneault MA, Li H, Park CB (2012) Poly (lactic acid) crystallization. Prog Polym Sci 37(12):1657–1677.  https://doi.org/10.1016/j.progpolymsci.2012.07.005CrossRefGoogle Scholar
  2. 2.
    Diep PTN, Mochizuki M, Doi M, Takagi H, Shimizu N, Igarashi N, Sasaki S, Sakurai S (2019) Effects of a special diluent as an agent of improving the crystallizability of poly(L-lactic acid). Polym J 51(2):283–294Google Scholar
  3. 3.
    Patwa R, Kumar A, Katiyar V (2018) Crystallization kinetics, morphology, and hydrolytic degradation of novel bio-based poly (lactic acid)/crystalline silk nano-discs nanobiocomposites. J App Polym Sci 135(33):46590.  https://doi.org/10.1002/app.46590CrossRefGoogle Scholar
  4. 4.
    Takagi H, Igarashi N, Mori T, Saijo S, Ohta H, Nagatani Y, Kosuge T, Shimizu N (2016) Upgrade of small angle X-ray scattering beamline BL-6A at the photon factory. In: AIP conference proceedings 2016 Jul 27, vol 1741, no 1. AIP Publishing, pp 030018.  https://doi.org/10.1063/1.4952841
  5. 5.
    Pandey AK, Katiyar V, Takagi H, Shimizu N, Igarashi N, Sasaki S, Sakurai S (2019) Structural evolution in isothermal crystallization process of Poly(L-lactic acid) enhanced by silk fibroin nano-disc. Materials 12(11):1872Google Scholar
  6. 6.
    Pandey AK, Katiyar V, Sasaki S, Sakurai S (2019) Accelerated crystallization of poly(l-lactic acid) by silk fibroin nanodisc. Polym J 51(11):1173–1180Google Scholar
  7. 7.
    Avrami M (1939) J. Chem. Phys. 7:1103. ibid. 8 (1940) 212; ibid. 9 (1941) 177Google Scholar
  8. 8.
    Schultz JM (2001) Polymer crystallization: the development of crystalline order in thermoplastic polymers. Am Chem SocGoogle Scholar
  9. 9.
    Strobl GR, Strobl GR (1997) The physics of polymers, vol 2. Springer, BerlinCrossRefGoogle Scholar
  10. 10.
    Tien ND, Hoa TP, Mochizuki M, Saijo K, Hasegawa H, Sasaki S, Sakurai S (2013) Higher-order crystalline structures of poly(oxyethylene) in poly(d,l-lactide)/poly(oxyethylene) blends. Polymer 54(17):4653–4659Google Scholar
  11. 11.
    Hoffman JD, Davis GT, Lauritzen JI (1976) Treatise on solid state chemistry, vol 3. Plenum Press, New York, pp 497Google Scholar
  12. 12.
    Fujiwara T, Miyamoto M, Kimura Y, Iwata T, Doi Y (2001) Self-organization of diblock and triblock copolymers of poly (l-lactide) and poly (oxyethylene) into nanostructured bands and their network system. Proposition of a doubly twisted chain conformation of poly (l-lactide). Macromolecules 34(12):4043–4050Google Scholar
  13. 13.
    Diep PTN, Takagi H, Shimizu N, Igarashi N, Sasaki S, Sakurai S (2019) Effects of Loading Amount of Plasticizers on Improved Crystallization of Poly (L-lactic acid). J Fiber Sci Technol 75(8):99–111Google Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2020

Authors and Affiliations

  • Amit Kumar Pandey
    • 1
  • Pham Thi Ngoc Diep
    • 1
  • Rahul Patwa
    • 2
  • Vimal Katiyar
    • 2
  • Sono Sasaki
    • 1
  • Shinichi Sakurai
    • 1
    Email author
  1. 1.Department of Biobased Materials ScienceKyoto Institute of TechnologyKyotoJapan
  2. 2.Department of Chemical EngineeringIndian Institute of Technology GuwahatiGuwahatiIndia

Personalised recommendations