Nam Ki-Ho, Cho Jaehyun, Yeo Hyeonuk
Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST), Jeonbuk 565-902, Korea.
Department of Chemistry Education, Chemistry Building, Kyungpook National University, 80, Daehak-ro, Buk-gu, Daegu 41566, Korea.
Polymers (Basel). 2017 Dec 26;10(1):29. doi: 10.3390/polym10010029.
In this study, we demonstrate an effective approach based on a simple processing method to improve the thermomechanical properties of graphene polymer composites (GPCs). Edge-selectively functionalized graphene (EFG) was successfully obtained through simple ball milling of natural graphite in the presence of dry ice, which acted as the source of carboxyl functional groups that were attached to the peripheral basal plane of graphene. The resultant EFG is highly dispersible in various organic solvents and contributes to improving their physical properties because of its unique characteristics. Pyromellitic dianhydride (PMDA) and 4,4'-oxydianiline (ODA) were used as monomers for constructing the polyimide (PI) backbone, after which PI/EFG composites were prepared by in situ polymerization. A stepwise thermal imidization method was used to prepare the PI films for comparison purposes. The PI/EFG composite films were found to exhibit reinforced thermal and thermo-mechanical properties compared to neat PI owing to the interaction between the EFG and PI matrix.
在本研究中，我们展示了一种基于简单加工方法的有效途径，以改善石墨烯聚合物复合材料（GPCs）的热机械性能。通过在干冰存在下对天然石墨进行简单的球磨，成功获得了边缘选择性功能化石墨烯（EFG），干冰作为羧基官能团的来源，这些官能团附着在石墨烯的外围基面。所得的EFG在各种有机溶剂中具有高度分散性，并因其独特特性有助于改善其物理性能。均苯四甲酸二酐（PMDA）和4,4'-二氨基二苯醚（ODA）用作构建聚酰亚胺（PI）主链的单体，之后通过原位聚合制备PI/EFG复合材料。为了进行比较，采用逐步热亚胺化方法制备PI薄膜。由于EFG与PI基体之间的相互作用，发现PI/EFG复合薄膜与纯PI相比表现出增强的热性能和热机械性能。
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