Porous Carbon-Silica Composites Prepared from Rice Husks as Green Fillers for Electronic Packaging Applications

• Main Authors: Ya-YuHsieh, 謝雅玉
• Other Authors: Hong-Ping Lin
• Format: Others
• Language: en_US
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/px48k8

博士 === 國立成功大學 === 化學系 === 105 === Going “green” is noticeably becoming a major consideration for the manufacturing of electronic devices to preserve our natural resources in the world and to achieve a sustainability generation in future. For this reason, we have developed an interest in the three main objectives for this research thesis are as follows: Part I: Ionic Content Effect of Rice Husks-derived Porous Carbon–Silica on the Mechanical and Thermal Properties of Epoxy Composites In this study firstly focused on the preparation and characterization of a low ionic content of the agricultural waste rice husks-derived porous carbon-silica by using a simple post-hydrothermal processe after pre-acid-hydrothermal through and pyrolysis under nitrogen condition for electronic packaging demand. The ionic content of [Cl-], [Na+], and [K+] of the BRH sample respectively were 4.3, 9.8, and 9.0 ppm after further post-hydrothermal process. XRD diagram shows that the structure of the calcined BRH material is in amorphous form, which is non-toxic to humans. As green filler, the uniformly dispersed BRH filler in the epoxy matrix through hydrogen bonding of the silanol group of silica. An improvement of 147% in storage modulus, 49% in CTE and 142% in thermal conductivity of the epoxy/preBRH composites at 46 wt.% filler content, compared with neat epoxy. Part II: Carbon Content Effect of Rice Husks-derived Porous Carbon–Silica on the Mechanical and Thermal Properties of Epoxy Composites In this study, bio-based porous carbon-controllable carbon-silica composite was easily prepared by using post-prolysis treatment under air condition. As green filler, the uniformly dispersed BRH filler well interact with the epoxy matrix which resulting in the thermal conductivity and thermal-mechanical properties of the epoxy/preBRH composites improved as increasing carbon content. At 29 wt.% of filler content, the epoxy composites exhibit lower curing temperature (148°C), lower CTE (42 ppm/°C), higher Tg (123°C), higher storage modulus (4059 MPa), and higher effective thermal conductivity (0.290 W/mK). Part III: Microwave Treatment Effect of Rice Husks-derived Porous Carbon-Silica on the Mechanical and Thermal Properties of Epoxy Composites This study focused on the effect of microwave treatment of the postBRH filler and its function in epoxy matrix for electronic packaging applications. XRD result indicated that partial SiC formation after microwave treatment. As green filler, an improvement of 178% in thermal conductivity, 149% in storage modulus and 17.6°C in Tg of the microwave treated-postBRH/epoxy composites at 40 wt.% of filler content, compared with neat epoxy. By modeling, the microwave treated-postBRH/epoxy composites at the same filler content have better stress reduction and thermal performance than commercial silica filled underfill also have verified. In brief, the rice husks-derived carbon-silica, 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.