Meng Yiming, Sharma Sushant, Gan Wenjun, Hur Seung Hyun, Choi Won Mook, Chung Jin Suk
School of Chemical Engineering, University of Ulsan, Daehakro 93, Namgu, Ulsan 44610, Korea.
Department of Macromolecular Materials and Engineering, College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China.
Nanomaterials (Basel). 2021 Jan 16;11(1):228. doi: 10.3390/nano11010228.
Herein, a feasible and effective approach is developed to build an electrically conductive and double percolation network-like structure via the incorporation of highly reduced graphene oxide (HRGO) into a polymer blend of diglycidyl ether of bisphenol A/polyetherimide (DGEBA/PEI). With the assistance of the curing reaction-induced phase separation (CRIPS) technique, an interconnected network of HRGO is formed in the phase-separated structure of the DGEBA/PEI polymer blend due to selective localization behavior. In this study, HRGO was prepared from a unique chemical reduction technique. The DGEBA/PEI/HRGO nanocomposite was analyzed in terms of phase structure by content of PEI and low weight fractions of HRGO (0.5 wt.%). The HRGO delivered a high electrical conductivity in DGEBA/PEI polyblends, wherein the value increased from 5.03 × 10 S/m to 5.88 S/m at a low content of HRGO (0.5 wt.%). Furthermore, the HRGO accelerated the curing reaction process of CRIPS due to its amino group. Finally, dynamic mechanical analyses (DMA) were performed to understand the CRIPS phenomenon and selective localization of HRGO reinforcement. The storage modulus increased monotonically from 1536 MPa to 1660 MPa for the 25 phr (parts per hundred in the DGEBA) PEI polyblend and reached 1915 MPa with 0.5 wt.% HRGO reinforcement. These simultaneous improvements in electrical conductivity and dynamic mechanical properties clearly demonstrate the potential of this conductive polyblend for various engineering applications.
在此，通过将高度还原的氧化石墨烯（HRGO）掺入双酚A二缩水甘油醚/聚醚酰亚胺（DGEBA/PEI）的聚合物共混物中，开发了一种可行且有效的方法来构建导电且类似双渗流网络的结构。在固化反应诱导相分离（CRIPS）技术的辅助下，由于选择性定位行为，在DGEBA/PEI聚合物共混物的相分离结构中形成了相互连接的HRGO网络。在本研究中，HRGO是通过独特的化学还原技术制备的。通过PEI含量和低重量分数的HRGO（0.5 wt.%）对DGEBA/PEI/HRGO纳米复合材料的相结构进行了分析。HRGO在DGEBA/PEI共混物中具有高电导率，其中在低含量的HRGO（0.5 wt.%）下，该值从5.03×10 S/m增加到5.88 S/m。此外，HRGO由于其氨基加速了CRIPS的固化反应过程。最后，进行动态力学分析（DMA）以了解CRIPS现象和HRGO增强材料的选择性定位。对于25 phr（DGEBA中的每百份份数）的PEI共混物，储能模量从1536 MPa单调增加到1660 MPa，在0.5 wt.%的HRGO增强下达到1915 MPa。电导率和动态力学性能的这些同时改善清楚地证明了这种导电共混物在各种工程应用中的潜力。
