Abstract
A lignin–alginate blended film was prepared in the presence of three different plasticizers, viz. glycerol, epichlorohydrin (EPC) and poly(ethylene glycol) (PEG) and the effect of each plasticizer was studied on physico-chemical properties of the blended film. Lignin extracted from Acacia wood by alkali extraction process was blended with alginate to obtain lignin–alginate film in the presence of different plasticizers. A film plasticized with glycerol displayed higher solubility and swelling percentage as compared to EPC and PEG plasticized films. The highest tensile strength was observed for film plasticized with PEG, and none of the plasticizers made any significant change on the bursting strength of the film. Incorporation of lignin considerably improved the light barrier properties of the films. Fourier transform infrared spectroscopy study of films suggested the existence of hydrogen bonding between lignin–alginate in the presence of plasticizers. In addition, EPC plasticized film displayed highest thermal stability, as confirmed by thermogravimetric analysis. Further studies demonstrated that plasticizers significantly affected the physico-chemical properties of the blended films. In conclusion, lignin–alginate film plasticized with EPC presented better physico-mechanical and light barrier properties which could be used in packaging and coating applications.
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Acknowledgments
The authors are grateful to the University Grant Commission (UGC), New Delhi, India for funding the project vide-F. No. 41-543/2012 (SR) and to Sophisticated Test and Instrumentation Centre (STIC), Cochin University of Science and Technology, Cochin, Kerala, for sample analysis. The authors also thank Dr. Neha Pandey for help in editing the manuscript.
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Aadil, K.R., Jha, H. Physico-chemical properties of lignin–alginate based films in the presence of different plasticizers. Iran Polym J 25, 661–670 (2016). https://doi.org/10.1007/s13726-016-0449-1
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DOI: https://doi.org/10.1007/s13726-016-0449-1