Bio-based porous carbon/silica particles (denoted as RH-carbon/silica) were successfully prepared from agricultural waste rice husk by using acid-hydrothermal treatment and pyrolysis under nitrogen condition. As green filler, the cure behavior, thermal-mechanical properties, and thermal conductivity of the epoxy-carbon/silica biocomposites at different filler contents (5, 9, 17, 29 wt ) were characterized. Because of superior surface properties (surface area, porosity, and silica segment) and high content of carbon component in the RH-carbon/silica, the characteristics of the biocomposites were significantly improved with the increase of the filler content. At 29 wt of filler content, the epoxy biocomposites exhibit lower curing temperature (148 degrees C), lower CTE (42 ppm/degrees C), higher T-g (123 degrees C), higher storage modulus (4059 MPa), and higher effective thermal conductivity (0.29 W/mK). In brief, the RH-carbon/silica particles that can serve not only as reinforcing agent but also as thermal transport medium used in epoxy composite, is a green and high-performance filler for this purpose. (C) 2016 Wiley Periodicals, Inc.
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