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Thermal conductivity, electrical resistivity and dynamic mechanical analysis of polyester-imide resin/nanocellulose composites

Nanocellulose is gaining increasing attention as a filler in polymers because it is relatively inexpensive, abundant, biodegradable, and renewable, while significantly improving the mechanical properties and thermal conductivity of polymer composites. [1, 2] Polyester-imide resins have acceptable performance as electrically insulating materials, while their other properties can be improved by using fillers, especially in terms of improving their thermal conductivity. In our research we measured the thermal conductivity, electrical resistivity, and dynamic mechanical properties of neat thermoset polyester-imide resin and composites. The composites contain cellulose nanocrystals (CNC) or cellulose nanofibrils (CNF) with a content between 0.5 and 5 wt% and were homogenized in a mixer with high shear rate. The thermal conductivity of the samples was measured by the transient hot bridge method, while the electrical volume resistivity was measured through electrical insulation resistance test. The mechanical properties of the composites were studied by dynamic mechanical analysis using a hybrid rheometer. The largest increase of thermal conductivity of 12.2% compared to neat resin was achieved with 5 wt% CNF, while the largest increase in volume electrical resistivity (22.1% compared to neat resin) was achieved using 1 wt% CNC.

nanocellulose ; polyester-imide resin ; thermal conductivity ; electrical resistivity

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