| Summary: | 碩士 === 逢甲大學 === 纖維與複合材料學系 === 102 === Graphene oxide (GO) and modified graphene oxide (MGO) were composited into polyamide 6 (PA6) matrix by ultilizing an in-situ polymerization process. This research is divided into three stages. In the first stage, graphene oxide was modified through different processes to graft functional groups and to partially reduce on the surface of graphene oxide. In the second stage, different modified graphene oxide were added into caprolactam (CPL) with a constant fraction of 0.1 wt.%. After ring-opening polymerization reaction, purification, and drying, various PA6/MGO composites were synthesized. The physical properties chemical properties, thermal properties, and mechanical properties of different composites were compared. Finally, the modified graphene oxide which enables the best composite performance was selected. The different fraction of selected modified graphene oxide were composited into PA6/MGO composites in the third stage to investigate the influences of MGO contents on composite properties.
The results show that, the PA6/MGO composites contains 0.1 wt.% graphene oxide which modified via 16 h 80 °C methanol then 16 h 80 °C ammonia hydroxide exhibits higher tensile strength of 81.71 MPa and tensile strain of 470.65%. It also shows high heat-absorbing and radiating temperature difference of 22.9 °C and 17.2 °C, respectively. When the fraction of such modified graphene oxide increases to 1.0 wt.%, the composite materials had a similar mechanical properties than the original PA6 materials, and shows the heat-absorbing and radiating temperature difference of 23.9 °Cand 19.1 °C, respectively. Thermal conductivity and Q-max value of the composite with such modified graphene oxide increases with the addition ratio. The composite with 2.0 wt.% modified graphene oxide exhibits highest flame-retardant effect with a L.O.I value of 30.0 and a surface resistivity of 8.43*109 Ω/cm2.
The results of this work demonstrate several interesting properties of PA6/MGO composites. These composite materials show display high heat-absorbing, heat conducting, and excellent flame retardant properties. They can be used widely applied on many field, such as household electric appliance, lampshade, and cooling plymeric materials, etc in the future.
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