High-concentration organic solutions of poly(styrene-co-butadiene-co-styrene)-modified graphene sheets exfoliated from graphite
High-concentration organic solutions of poly(styrene-co-butadiene-co-styrene)-modified graphene sheets exfoliated from graphite
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从石墨剥离的聚（苯乙烯-丁二烯-苯乙烯）改性石墨烯片的高浓度有机溶液
DOI：
10.1016/j.carbon.2011.04.052
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发表时间：
2011-09-01
期刊：
影响因子：
10.9
通讯作者：
Ye, Xiong-Ying
中科院分区：
文献类型：
--
作者：
Liu, Yi-Tao;Xie, Xu-Ming;Ye, Xiong-Ying
开发了一种简单的方法来生产用苯乙烯-丁二烯-苯乙烯共聚物（SBS）非共价改性的石墨烯片的高浓度有机溶液。一旦在超声处理下从天然石墨上剥离下来，石墨烯片就可以通过 SBS 通过与 PS 链的 pi-pi 堆叠来稳定。 PS-石墨烯相互作用通过DSC得到证实，因为PS嵌段的玻璃化转变温度增加了大约8摄氏度，而PB嵌段的玻璃化转变温度保持不变。通过 TGA 测定吸附在石墨烯片上的 SBS 含量约为 63 wt.%。通过 HRTEM 实现了直接形态观察，它揭示了石墨烯片上的无定形聚合物层，各个聚合物链爬上边缘。制备了一种独立的、高度柔性的 SBS 改性石墨烯薄膜。石墨烯在有机溶剂中溶解度的提高为石墨烯在聚合物基体中的溶液相结合开辟了新的机会。石墨烯/SBS 复合材料具有优异的导电性，渗流阈值接近 0.25 vol.%。此外，事实证明SBS还可以吸附在化学改性的石墨烯和碳纳米管上，证明了PS链和石墨平面之间π-π堆积的多功能性。 (C) 2011 Elsevier Ltd. 保留所有权利。
A simple method is developed to produce high-concentration organic solutions of graphene sheets noncovalently modified with poly(styrene-co-butadiene-co-styrene) (SBS). Once exfoliated from natural graphite under sonication, the graphene sheets can be stabilized by SBS through the pi-pi stacking with the PS chains. The PS-graphene interaction is confirmed by DSC, since the glass transition temperature of the PS blocks increases by similar to 8 degrees C, while that of the PB block remains unchanged. The content of SBS adsorbed on the graphene sheets is determined by TGA as similar to 63 wt.%. Direct morphological observation is achieved by HRTEM, which reveals an amorphous polymer layer on the graphene sheets with individual polymer chains climbing on the edges. A freestanding, highly flexible film of SBS-modified graphene is prepared. The improved solubility of graphene in the organic solvents opens up a new opportunity for the solution-phase incorporation of graphene in the polymer matrices. The graphene/SBS composite has an excellent electrical conductivity with a percolation threshold of similar to 0.25 vol.%. Besides, it is proven that SBS can also be adsorbed on chemically modified graphene and carbon nanotubes, demonstrating the versatility of the pi-pi stacking between the PS chains and the graphitic planes. (C) 2011 Elsevier Ltd. All rights reserved.