Abstract
Starch was transformed to hydrophobic starch phthalate (contact angle 109°) in order to achieve a good dispersion in LDPE matrix. Nanosilica derived from rice husk after aminopropyltrimethoxysilane functionalization was also incorporated into the blend as property-enhancing filler. The produced crystalline starch phthalate had a lower particle size of 9.87 μm and a higher surface area of 2.87 m2/g compared to starch (40.28 μm, 1.91 m2/g). The potential quality modification of starch phthalate as a substitute for starch towards the production of a perfect biodegradable blend was quantified in terms of mechanical (tensile, tear, stiffness), optical (haze, transmittance), and biodegradation assessments. Interfacial adhesion between LDPE and starch phthalate was well justified by the morphology and enhancement in mechanical properties like tensile and tear strength from 8.87 to 12.67 MPa and 96.57 to 187.10 N/mm for 30% of starch or starch phthalate in LDPE matrix, respectively. Starch phthalate compared to starch blended films showed a higher biodegradation rate of 14.8 and 13.5% in garden soil and vegetable waste respectively in 1 year (at 30% biofiller), with a good first-order kinetics fit of the weight loss data having a higher degradation rate constant at higher content of biofiller in the blend.
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Acknowledgments
The technical support from the technicians of Central Institute of Plastic Engineering & Technology - Institute of Plastic Technology, Bhubaneswar, Odisha, is gratefully appreciated.
Funding
This study is financially supported by the Department of Science and Technology, Government of West Bengal, India, through research project ST/P/S&T/IG-9/2016 (File no. 680(Sanc.)/ST/P/S&T/15G-3/2016).
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Highlights
•Starch was esterified using phthalic anhydride to enhance its compatibility with LDPE.
•Different composition of starch phthalate/LDPE/modified nanosilica films was produced.
•Interfacial adhesion of the biofiller with LDPE was proved by chemical reactions.
•Optimum modified biofiller (30%) films have tensile strength 12.67 MPa and transmittance 89.3%.
•Biodegradability and biodegradation kinetics was tested under soil and vegetable waste.
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Datta, D., Halder, G. Blending of phthalated starch and surface functionalized rice husk extracted nanosilica with LDPE towards developing an efficient packaging substitute. Environ Sci Pollut Res 27, 1533–1557 (2020). https://doi.org/10.1007/s11356-019-06430-1
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DOI: https://doi.org/10.1007/s11356-019-06430-1