Poly (lactic acid) (PLA) is a biodegradable polymer that can be used as an alternative to petroleum-derived polymers. In addition to having good mechanical strength, it has some disadvantages such as brittleness and low toughness. To improve the weak properties of PLA, various fillers, and polymers such as polyethylene, polypropylene, and polycarbonate (PC) as the blend of PLA have been studied in the literature. PC/PLA mixtures have attracted attention in the electronics industry in recent years and have been used in products such as mobile phones. Therefore, high mechanical and electrical properties are expected from the PC/PLA blend as well as biodegradability. In this study, the 70/30 ratio PC/PLA blend was used as a matrix. Reduced graphene oxide (rGO) and multi-walled carbon nanotube (MWCNT) were used as fillers to improve the properties of the PC/PLA matrix. The nanocomposites were produced by adding rGO and MWCNT fillers as a mixture (hybrid) form in equal amounts of 0.5-1-3 wt% into the PC/PLA matrix. Nanocomposites were prepared by using twin-screw extruders and injection moulding. Tensile, differential scanning calorimeter, thermogravimetric analysis and thermal conductivity tests were applied to determine the mechanical and thermal properties of nanocomposites. According to the tensile test results, the best tensile strength and elongation at break values were obtained by adding 0.5 wt% MWCNT-rGO mixture to the PC/PLA matrix. While Tg increased with the addition of hybrid fillers by 0.5 wt% and 1 wt%, a decrease in Tg value was observed with the addition of 3 wt% hybrid fillers.
The authors thank Scientific Research Projects Unit of Kocaeli University (KOUBAP) for financial support under Project number FYL-2021-2481.
Anahtar Kelimeler: Poly (lactic acid), polycarbonate, rGO, MWCNT