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Enzymatic and soil burial degradation of corn starch/glycerol/sodium montmorillonite nanocomposites

Ostadi, H ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1177/2041247920952649
  3. Publisher: SAGE Publications Ltd , 2020
  4. Abstract:
  5. In this study, effects of glycerol (10, 20, and 30 wt%) and Sodium Montmorillonite (Na-MMT) (0%, 2.5%, and 5%) contents on the degradation of corn starch polymers were investigated. Films were prepared by casting corn starch solution using a modified method to enhance the nanoclay distribution. Biodegradability studies were performed by enzymatic and burial tests using pristine and enriched soils. The biodegradability of samples in pristine soil was faster, and all samples were fully degraded in 6 months. The effect of nanoparticles on the mass reduction in degradation was more pronounced than that of glycerol. In all glycerol concentrations, Na-MMT addition increased tensile strength. FTIR tests showed that degradability was related to glycerol leaching at first and then cleaving of α-1,4 bonds of starch, indicating the action of α-amylase produced by soil microorganisms. Good agreement between soil burial tests and enzymatic degradation was observed. An optimum Glycerol/Clay ratio was observed at which d-spacing and mechanical properties were maximum. © The Author(s) 2020
  6. Keywords:
  7. Burial degradation ; Starch ; Biodegradability ; Clay minerals ; Glycerol ; Nanocomposites ; Soils ; Tensile strength ; Enzymatic Degradation ; Glycerol concentration ; Montmorillonite nanocomposites ; Nanoclay distributions ; Sodium montmorillonite ; Soil burial degradation ; Soil burial test ; Soil micro-organisms ; Soil testing
  8. Source: Polymers from Renewable Resources ; Volume 11, Issue 1-2 , 2020 , Pages 15-29
  9. URL: https://journals.sagepub.com/doi/full/10.1177/2041247920952649