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Multiple melting behavior of poly(lactic acid)-hemp-silica composites using modulated-temperature differential scanning calorimetry

  • Izan R. Mustapa EMAIL logo , Robert A. Shanks and Ing Kong
Published/Copyright: April 29, 2014
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Journal of Polymer Engineering
From the journal Journal of Polymer Engineering Volume 34 Issue 9

Abstract

Poly(lactic acid) (PLA)-hemp-nanosilica (PHS) composites were prepared by impregnation of hemp woven fabric with PLA solution. Nanosilica was dispersed in the PLA solution to introduce a matrix reinforcing nanophase within the composite. The melting behavior of PLA composites was obtained by using differential scanning calorimetry (DSC) and modulated-temperature DSC (mT-DSC). Multiple melting which appeared in the non-isothermal heating curve showed that the temperature of a low melting peak increased when using a slower scanning rate. The incorporation of nanosilica in PLA composites affected the melting temperature (Tm) and sufficiently formed nucleation sites that promoted the growth of PLA crystals. Composites analyzed by a temperature-modulated program showed a broad exothermic peak before the melting peak in the non-reversing heat capacity and endothermic melting in the reversing heat capacity curve. This behavior was explained by a process of partial melting, recrystallization and remelting (mrr). The mT-DSC resolved that hemp fiber induced recrystallization and nanosilica acted as an effective nucleating agent, which promoted small and imperfect crystals that changed successively into more stable crystals through a melt-recrystallization process.

Keywords: biopolymer; crystallization; hybrid composite; multiple melting
Corresponding author: Izan R. Mustapa, School of Applied Sciences, RMIT University, Box 2476 GPO, Melbourne, VIC 3001, Australia, e-mail:

Acknowledgments

The authors would like to acknowledge the facilities, the scientific and technical assistance of the Australian Microscopy and Microanalysis Research Facility, RMIT University, Australia.

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Received: 2013-7-1
Accepted: 2014-2-24
Published Online: 2014-4-29
Published in Print: 2014-12-1

©2014 by De Gruyter

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https://doi.org/10.1515/polyeng-2013-0161
Keywords for this article
biopolymer; crystallization; hybrid composite; multiple melting

Articles in the same Issue

  1. Frontmatter
  2. Original articles
  3. Curing kinetics of styrene-(ethylene-butylene)-styrene (SEBS) copolymer by peroxides in the presence of co-agents
  4. Synthesis and properties of novel high thermally stable polyimide-chrysotile composites as fire retardant materials
  5. Flame-resistant polymeric composite fibers based on nanocoating flame retardant: thermogravimetric study and production of α-Al2O3 nanoparticles by flame combustion
  6. Mechanical and morphological properties of high density polyethylene and polylactide blends
  7. Synthesis and characterization of magnetic Ni0.3 Zn0.7 Fe2 O4/polyvinyl acetate (PVAC) nanocomposite
  8. Effect of titanium nanofiller on the productivity and crystallinity of ethylene and propylene copolymer
  9. Mechanical properties of potassium hydroxide-pretreated Christmas palm fiber-reinforced polyester composites: characterization study, modeling and optimization
  10. Natural frequency response of laminated hybrid composite beams with and without cutouts
  11. Characterization of C2H2O4 doped PVA solid polymer electrolyte
  12. Development and characterization of homo, co and terpolyimides based on BPDA, BTDA, 6FDA and ODA with low dielectric constant
  13. Highly-filled hybrid composites prepared using centrifugal deposition
  14. Reinforcement of carboxylated acrylonitrile-butadiene rubber (XNBR) with graphene nanoplatelets with varying surface area
  15. Multiple melting behavior of poly(lactic acid)-hemp-silica composites using modulated-temperature differential scanning calorimetry
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