Flow-Induced Enhancement of in Situ Thermal Reduction of Graphene Oxide during the Melt-Processing of Polymer Nanocomposites
Flow-Induced Enhancement of in Situ Thermal Reduction of Graphene Oxide during the Melt-Processing of Polymer Nanocomposites
复制标题
聚合物纳米复合材料熔融加工过程中流动诱导增强氧化石墨烯的原位热还原
DOI：
10.1021/jp5074335
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发表时间：
2014-10
影响因子：
3.7
通讯作者：
Feng Jiachun
中科院分区：
文献类型：
--
作者：
Ye Shibing;Hu Dingding;Zhang Qinglong;Fan Jiashu;Chen Bin;Feng Jiachun
分散在聚合物基体中的氧化石墨烯（GO）的原位热还原（ISTR）因其作为制备聚合物/石墨烯纳米复合材料（PGN）的环境友好且商业上可行的工艺的巨大潜力而引起了广泛的兴趣。在这项工作中，对静态熔融和剪切熔融两种截然不同的条件下 GO 的 ISTR 进行了比较研究。对块状复合材料和从复合材料中提取的石墨烯基粉末的综合表征以及独立平行板实验的结果表明，在相同的加工温度和时间下，剪切熔体中的GO比静态熔体中的GO具有更高的还原度。根据我们的结果，我们假设剪切熔体中 GO 相对于静态熔体的更强烈的还原与增强的 π-π 堆积以及聚合物和 GO 片之间可能的自由基反应有关。
In situ thermal reduction (ISTR) of graphene oxide (GO) dispersed in a polymer matrix has attracted broad interest due to its great potential as an environmentally friendly and commercially viable process to prepare polymer/graphene nanocomposites (PGNs). In this work, the ISTR of GO in two dramatically different conditions, quiescent melt and sheared melt, was comparatively studied. Comprehensive characterization of the bulk composites and the extracted graphene-based powders from composites, as well as the results of an independent parallel plate experiment, revealed that the GO in the sheared melt has a higher reduction degree than that in the quiescent melt within identical processing temperatures and times. On the basis of our results, we hypothesize that the more intense reduction of GO in the sheared melts relative to the quiescent melts is associated with the enhanced π–π stacking and the possible radical reaction between polymers and GO sheets.
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