Abstract
The objective of this study is to enhance the dielectric properties of biocomposite films through the fabrication of biaxially oriented films (BO) and the incorporation of silver-coated microcrystalline cellulose (Ag/MCC). The silver coating was used in concentrations ranging from 0.2 to 2% using an environmentally friendly method. The dielectric constant and dielectric loss of all sample were measured in the frequency range from 103 to − 106 Hz. The sample containing 0.6% silver on microcrystalline cellulose (0.6Ag/MCC) demonstrated the highest dielectric constant, measured 64. Subsequently, biocomposite films were produced by utilizing 0.6%Ag/MCC at different ratios (1–5 phr) through a one-step cast film twin-screw extruder. The sample with the highest dielectric constant was PLA-0.6Ag/MCC4, which increased from 3 (PLA) to 37. Furthermore, biaxially oriented films were successfully prepared using a film biaxial stretching machine, achieving a thickness of 70 μm. This technique can significantly improve their dielectric properties, surpassing those of unstretched films. The improvement in dielectric properties can be attributed to the reorganization of molecular chains, promoting a more orderly arrangement and increases crystallinity. Therefore, the resultant biocomposite and biaxially oriented film demonstrate exceptional dielectric properties, rendering them suitable for dielectric applications such as capacitor dielectric films.
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Acknowledgements
The authors extend their appreciation to the Department of Materials Engineering, Faculty of Engineering, Kasetsart University, Department of Materials and Metallurgical Engineering, Faculty of Engineering, Rajamangala and The Petroleum and Petrochemical College, Chulalongkorn University for supporting this study.
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The authors extend their gratitude to the following organizations for their generous financial support: Funding for this research was provided by the National Research Council of Thailand (NRCT) through the Kasetsart University Research and Development Institute (KURDI), under grant number FF(KU) 51.67.
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Apirat Laobuthee : designing the idea and experimental tests, discussing, reading, editing, and final approval of the version to be published. Kanthita Sitisan : Experimental tests fabricating and characterising the experimental samples, analysing the data and writing and editig the manuscript. Kankavee Sukthavorn and Piyawanee Jariyasakoolroj: Reviewing commenting and discussing and editing. Chatchai Veranitisagul and Nollapan Nootsuwan: Reviewing and providing the facilities for this study. All authors reviewed the manuscript.
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Sitisan, K., Sukthavorn, K., Nootsuwan, N. et al. Development of Dielectric Biocomposite and Biaxially Oriented Films from Poly(Lactic Acid) and Nano-silver Coated Microcrystalline Cellulose. J Polym Environ (2024). https://doi.org/10.1007/s10924-024-03222-8
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DOI: https://doi.org/10.1007/s10924-024-03222-8