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A facile way to produce epoxy nanocomposites having excellent thermal conductivity with low contents of reduced graphene oxide

机译：一种生产环氧树脂纳米复合材料的简便方法，该环氧树脂纳米复合材料具有优异的导热性和低含量的还原氧化石墨烯

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A well-dispersed phase of exfoliated graphene oxide (GO) nanosheets was initially prepared in water. This was concentrated by centrifugation and was mixed with a liquid epoxy resin. The remaining water was removed by evaporation, leaving a GO dispersion in epoxy resin. A stoichiometric amount of an anhydride curing agent was added to this epoxy-resin mixture containing the GO nanosheets, which was then cured at 90 °C for 1 hour followed by 160 °C for 2 hours. A second thermal treatment step of 200 °C for 30 minutes was then undertaken to reduce further the GO in-situ in the epoxy nanocomposite. An examination of the morphology of such nanocomposites containing reduced graphene oxide (rGO) revealed that a very good dispersion of rGO was achieved throughout the epoxy polymer. Various thermal and mechanical properties of the epoxy nanocomposites were measured and the most noteworthy finding was a remarkable increase in the thermal conductivity when relatively very low contents of rGO were present. For example, a value of 0.25 W/mK was measured at 30 °C for the nanocomposite with merely 0.06 weight percentage (wt%) of rGO present, which represents an increase of ~40% compared with that of the unmodified epoxy polymer. This value represents one of the largest increases in the thermal conductivity per wt% of added rGO yet reported. These observations have been attributed to the excellent dispersion of rGO achieved in these nanocomposites made via this facile production method. The present results show that it is now possible to tune the properties of an epoxy polymer with a simple and viable method of GO addition.
机译：最初在水中制备了片状氧化石墨烯（GO）纳米片的分散良好的相。通过离心将其浓缩并与液体环氧树脂混合。通过蒸发除去残留的水，将GO分散体留在环氧树脂中。向该含有GO纳米片的环氧树脂混合物中加入化学计量的酸酐固化剂，然后将其在90℃下固化1小时，然后在160℃下固化2小时。然后进行第二次热处理步骤，在200°C下进行30分钟，以进一步还原环氧纳米复合材料中的GO。对包含还原的氧化石墨烯（rGO）的纳米复合材料的形态进行检查后发现，rGO的分散性非常好。测量了环氧纳米复合材料的各种热和机械性能，最值得注意的发现是当存在相对非常低的rGO含量时，导热系数显着增加。例如，对于纳米复合材料，在30°C下测得的0.25 W / mK值仅存在0.06重量百分比（wt％）的rGO，与未改性的环氧聚合物相比，增加了约40％。该值代表尚未报告的每wt％添加的rGO的导热系数的最大增加之一。这些观察结果归因于通过这种简便的生产方法在这些纳米复合材料中实现的rGO优异的分散性。目前的结果表明，现在可以用一种简单可行的GO添加方法来调节环氧聚合物的性能。

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