Journal
COLLOIDS AND SURFACES B-BIOINTERFACES
Volume 159, Issue -, Pages 800-808Publisher
ELSEVIER
DOI: 10.1016/j.colsurfb.2017.08.056
Keywords
Poly (lactic acid); Biodegradation; Modelling
Funding
- Fundamental Research Funds for the Central Universities [2572016DB01, 2572016AB17, 2572017EB06]
- National Forestry Public Welfare Industry Major Projects of Scientific Research [201504502]
- National Natural Science Foundation of China [31670569]
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The biodegradation behavior of Poly (lactic acid) (PLA) blended with starch and wood flour in outdoor soil was investigated comprehensively. As a result, starch provided a biological fuel for the growth of microorganisms in the soil which accelerated the degradation rate of PLA more obviously than wood flour. With the increase of starch content, the weight loss increased and the morphology exhibited more gullies and cavities. X-ray Photoelectron Spectroscopy (XPS) analysis indicated that the variation of O/C ratio was controlled by starch biodegradation and PLA hydrolysis and they were a concomitant process. The mechanical strengths of all the blends showed similar trend and fitted a first-order exponential decay model. The model is shown in good agreement with experimental results as the correlation coefficient is higher than 0.99, and the model can support an efficient method to estimate the durability of starch/wood flour/PLA blends. (C) 2017 Elsevier B.V. All rights reserved.
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