Biodegradation behavior of poly(lactic acid) (PLA)/Distiller's dried grains with solubles (DDGS) composites

Hong Lu, Samy Madbouly, James A. Schrader, Gowrishankar Srinivasan, Kenneth G. Mccabe, David Grewell, Michael R. Kessler, William R. Graves

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Poly(lactic acid) (PLA) and distiller's dried grains with solubles (DDGS) are biobased materials with strong potential for industrial applications. This paper reports the biodegradation behavior of PLA/DDGS (80/20 by weight), a composite material developed for use in highquality, economical, biodegradable, crop containers for the horticulture industry. Biodegradation experiments were performed in soil under landscape conditions. Surface morphology and thermal properties were evaluated by scanning electron microscopy (SEM), dynamic mechanical analysis (DMA), and differential scanning calorimetry (DSC). We found that adding 20% DDGS to form the PLA/DDGS composite can accelerate the biodegradation rate and enhance the storage modulus compared to pure PLA. The weight loss of the PLA/DDGS composite during 24 weeks of degradation time was 10.5%, while the weight loss of pure PLA was only 0.1% during the same time interval. Cracks and voids caused by erosion and loss of polymer chain length were clearly observed on the surface of the composite material in response to increasing degradation time. The thermal stability of the composite increased with increasing degradation time. The glass transition temperature and melting temperature increased during early stages of biodegradation (up to 16 weeks) and then decreased slightly. We confirm that DDGS can function as a cost-effective biodegradable filler for PLA composites that can provide enhanced mechanical properties with only slight changes in thermal properties when compared to pure PLA.

Original languageEnglish (US)
Pages (from-to)2699-2706
Number of pages8
JournalACS Sustainable Chemistry and Engineering
Volume2
Issue number12
DOIs
StatePublished - Dec 1 2014

Fingerprint

Lactic acid
Biodegradation
biodegradation
acid
Composite materials
Degradation
degradation
Thermodynamic properties
horticulture
calorimetry
Dynamic mechanical analysis
Chain length
void
Industrial applications
Crops
Surface morphology
Containers
Melting point
poly(lactic acid)
Fillers

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment

Cite this

Lu, Hong ; Madbouly, Samy ; Schrader, James A. ; Srinivasan, Gowrishankar ; Mccabe, Kenneth G. ; Grewell, David ; Kessler, Michael R. ; Graves, William R. / Biodegradation behavior of poly(lactic acid) (PLA)/Distiller's dried grains with solubles (DDGS) composites. In: ACS Sustainable Chemistry and Engineering. 2014 ; Vol. 2, No. 12. pp. 2699-2706.
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Biodegradation behavior of poly(lactic acid) (PLA)/Distiller's dried grains with solubles (DDGS) composites. / Lu, Hong; Madbouly, Samy; Schrader, James A.; Srinivasan, Gowrishankar; Mccabe, Kenneth G.; Grewell, David; Kessler, Michael R.; Graves, William R.

In: ACS Sustainable Chemistry and Engineering, Vol. 2, No. 12, 01.12.2014, p. 2699-2706.

Research output: Contribution to journalArticle

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AU - Lu, Hong

AU - Madbouly, Samy

AU - Schrader, James A.

AU - Srinivasan, Gowrishankar

AU - Mccabe, Kenneth G.

AU - Grewell, David

AU - Kessler, Michael R.

AU - Graves, William R.

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