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由二氧化硅改性氧化石墨烯制备的环氧树脂/氧化石墨烯复合材料的结构与性能

Structure and Properties of Epoxy Resin/Graphene Oxide Composites Prepared from Silicon Dioxide-Modified Graphene Oxide.

作者信息

An Jin, Zhang Yue, Zhang Xiaojun, He Mingpeng, Zhou Jiang, Zhou Jin, Liu Yan, Chen Xuebing, Hu Yiwen, Song Xiuduo, Chen Jinyao, Wu Tong, Kang Jian, Xie Zhihui

机构信息

State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China.

Dongfang Electric Machinery Co., Ltd., Deyang 618000, China.

出版信息

ACS Omega. 2024 Apr 6;9(15):17577-17591. doi: 10.1021/acsomega.4c00707. eCollection 2024 Apr 16.

DOI:10.1021/acsomega.4c00707
PMID:38645374
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11024974/
Abstract

In this study, graphene oxide (GO) was modified via electrostatic interactions and chemical grafting by silica (SiO), and two SiO@GO hybrids (GO-A and GO-B, respectively) with different structures were obtained and carefully characterized. Results confirmed the successful grafting of SiO onto the GO surface using both strategies. The distribution of SiO particles on the surface of GO-A was denser and more agglomerated, while it was more uniform on the surface of GO-B. Then, epoxy resin (EP)/GO composites were prepared. The curing mechanism of EP/GO composites was studied by differential scanning calorimetry and in situ infrared spectra spectroscopy. Results of tensile tests, hardness tests, dynamic mechanical analysis, and dielectric measurement revealed that EP/GO-B exhibited the highest tensile properties, with a tensile strength of 79 MPa, a 43% increase compared to raw EP. Furthermore, the addition of fillers improved the hardness of EP, and EP/GO-B showed the highest energy storage modulus of 1900 MPa. The inclusion of SiO@GO hybrid fillers enhanced the dielectric constant, volume resistivity, and breakdown voltage of EP/GO composites. Among these, EP/GO-B displayed the lowest dielectric loss, relatively good insulation, and relatively high volume resistivity and breakdown voltage. A related mechanism was proposed.

摘要

在本研究中，通过静电相互作用和二氧化硅（SiO）的化学接枝对氧化石墨烯（GO）进行了改性，获得了两种具有不同结构的SiO@GO杂化物（分别为GO-A和GO-B）并对其进行了详细表征。结果证实了使用这两种策略均成功地将SiO接枝到了GO表面。GO-A表面上SiO颗粒的分布更密集且团聚更多，而在GO-B表面上则更均匀。然后，制备了环氧树脂（EP）/GO复合材料。通过差示扫描量热法和原位红外光谱对EP/GO复合材料的固化机理进行了研究。拉伸试验、硬度试验、动态力学分析和介电测量结果表明，EP/GO-B表现出最高的拉伸性能，拉伸强度为79 MPa，与纯EP相比提高了43%。此外，填料的添加提高了EP的硬度，并且EP/GO-B表现出最高的储能模量，为1900 MPa。SiO@GO杂化填料的加入提高了EP/GO复合材料的介电常数、体积电阻率和击穿电压。其中，EP/GO-B表现出最低的介电损耗、相对良好的绝缘性以及相对较高的体积电阻率和击穿电压。并提出了相关机理。

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