Resolving the dilemma of gaining conductivity but losing environmental friendliness in producing polystyrene/graphene composites via optimizing the matrix-filler structure
Resolving the dilemma of gaining conductivity but losing environmental friendliness in producing polystyrene/graphene composites via optimizing the matrix-filler structure
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DOI：
10.1039/c3gc37042a
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发表时间：
2013-02
期刊：
影响因子：
9.8
通讯作者：
G. Long;Changyu Tang;K. Wong;Changzhen Man;Meikun Fan;W. Lau;Tao Xu;Bin Wang
中科院分区：
文献类型：
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作者：
G. Long;Changyu Tang;K. Wong;Changzhen Man;Meikun Fan;W. Lau;Tao Xu;Bin Wang
在这项工作中，我们报告了一种新的方法来解决生产导电聚苯乙烯/还原氧化石墨烯（PS/RGO）复合材料的实际问题，即由于普遍的化学设计强调通过使用强毒性化学物质或耗能热处理来提高RGO生产中的导电性，因此提高导电性不利于该过程的环境友好性的困境。这些设计依靠有机溶剂、化学功能化和稳定剂来克服分散和将还原氧化石墨烯结合到聚合物基体中的困难。在我们的新设计中，我们强调了一个紧凑的渗透三维微细胞RGO网络，具有长程有序，是RGO在高复合电导率方面最有效的利用。在此指导下，氧化石墨烯和非极性PS单分散微球在水中共分散，氧化石墨烯在微球上稳定吸附。PS/氧化石墨烯微球随后用无毒还原剂（如维生素c）还原，PS/氧化石墨烯微球随后被热压成具有所需的致密渗透三维微细胞氧化石墨烯结构的复合材料。从所得复合材料中收集的实验数据验证了设计，并且确实显示出低渗透阈值（0.08 vol%），高电导率（20.5 S m−1），并且很好地符合绿色化学原理。
In this work, we report a new approach to resolve a practical problem in producing conductive polystyrene/reduced-graphene-oxide (PS/RGO) composites, i.e. the dilemma that raising the conductivity detrimentally compromises the environmental friendliness of the process because the prevalent chemistry designs emphasize raising conductivity in RGO production by employing strong and toxic chemicals or energy-consuming heat treatments. These designs then rely on organic solvents, chemical functionalization, and stabilizers to overcome the difficulty in dispersing and incorporating RGO into the polymer matrix. In our new design, we emphasize that a compact percolated three-dimensional microcellular RGO network with long-range order is the most effective use of RGO for high composite conductivity. With this guide, GO and non-polar PS mono-dispersed microspheres are co-dispersed in water, with GO stably adsorbing on the microspheres. PS/GO microspheres are then reduced with a nontoxic reducing agent such as vitamin C. PS/RGO microspheres are subsequently hot-pressed into a composite with the required compact percolated three-dimensional microcellular RGO structure. Experimental data collected from the resultant composites validate the design and indeed show low percolation threshold (0.08 vol%), high conductivity (20.5 S m−1), and good compliance with the principles of green chemistry.