Micro-graphite was incorporated into poly(lactic acid) via solution blending in chlorof orm with varying concentrations: 0, 5, 10, and 15%wt. Before being poured in the glass mold, the adding micro-graphite is accompanied by stirring at 650 rpm and 60°"C (for 1 hour) to homogenize the dispersion of micro-graphite into the PLA solution. This report is discussing the characterization results of the prepared micro-composites, i.e., crystallinity and electrical properties. The crystallinity was analyzed using X-ray Diffraction (XRD) and Differential Scanning Calorimetry (DSC). Both surface and bulk crystallinity were demonstrating a considerable dependence with the micro-graphite loading. The onset temperature of the melting point has a slight shift about 2-4°C. However, the melting point of neat PLA and micro-composites is not significantly changed. The electrical property was carried by Keithley 2602A SYSTEM SourceMeter to measure their resistivity. In the voltage range of 0-1 volt, the presence of micro-graphite starts to have an impact at 15%wt load. Resistivity decreases become 1,686*104 Q.mm from out of the device measurement range. The ATR-FTIR (Attenuated Total Reflection-FTIR) spectra show that the residue of chlorof orm solvent is not detected in the dry prepared samples. It means the solvent can be predicted totally evaporated from the sample.
CITATION STYLE
Shohih, E. N., Kaavessina, M., & Distantina, S. (2020). Preparation and characterization of micro-graphite filled poly(lactic acid) composites: Part 2 - Crystallinity and electrical properties. In AIP Conference Proceedings (Vol. 2296). American Institute of Physics Inc. https://doi.org/10.1063/5.0030590
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