Hussein Mahmoud A, Abu-Zied Bahaa M, Asiri Abdullah M
Chemistry Department, Faculty of Science, King Abdulaziz University P. O. Box 80203 Jeddah 21589 Saudi Arabia
Chemistry Department, Faculty of Science, Assiut University Assiut 71516 Egypt
RSC Adv. 2018 Jun 28;8(42):23555-23566. doi: 10.1039/c8ra03109f. eCollection 2018 Jun 27.
The present study is aimed to fabricate composite materials containing epoxy resin (EPYR) reinforced by mixed carbon-based nano-fillers in the form of graphene nano-platelet (GNP) and multi-walled carbon nanotube (MWCNT) using the dissolution casting technique with the help of ultrasonic assistance. The pure epoxy resin was reinforced by variable loading of mixed GNP/MWCNT , and the epoxy resin is denoted as EPYR/GNP/MWCNT. The numbers 2-30 corresponded to the final mass ratio of the nano-fillers. The designed products were reinforced by variable percentages of GNP/MWCNTs. XRD, FT-IR, thermal analyses, FE-SEM, TEM and electrical conductivity were utilized as identification techniques to confirm the structures of these composite materials. An excellent evidence for the composite formation was given by XRD diffraction patterns and FT-IR spectroscopy. The introduced amounts of mixed nano-fillers showed significant effects on the thermal, conducting and coating behaviors of pure EPYR. Pure EPYR and EPYR/GNP/MWCNT showed higher thermal stabilities than other materials in the range of 400-410 °C. EPYR/GNP/MWCNT also showed remarkable increase in the thermal stability compared to other materials. represents the temperatures at which 10% weight losses are examined. Pure EPYR and its related EPYR/GNP/MWCNT displayed similar thermal stabilities at temperature (330 ± 4 °C). The morphological features were examined by SEM and TEM; these features showed that the nanocomposite components were extremely compatible. The electrical conductivity values showed noticeable enhancement for the formulations of EPYR/GNP/MWCNT. Moreover, the coating performance of EPYR was tested by water uptake experiments and electrochemical impedance; both tests proved that the mixed GNP/MWCNT nano-fillers remarkably improved the pure EPYR coating due to the ionic charge transfer resistance and elevated barrier behaviour. The coating resistance variations values (CRv) of EPYR/GNP/MWCNT were the highest among the measured composition values, closely followed by those of EPYR/GNP/MWCNT and EPYR/GNP/MWCNT.
本研究旨在借助超声辅助，采用溶解浇铸技术制备以石墨烯纳米片（GNP）和多壁碳纳米管（MWCNT）形式存在的混合碳基纳米填料增强的环氧树脂（EPYR）复合材料。通过不同负载量的混合GNP/MWCNT增强纯环氧树脂，所得环氧树脂记为EPYR/GNP/MWCNT。数字2 - 30对应纳米填料的最终质量比。设计的产品用不同百分比的GNP/MWCNTs增强。利用X射线衍射（XRD）、傅里叶变换红外光谱（FT - IR）、热分析、场发射扫描电子显微镜（FE - SEM）、透射电子显微镜（TEM）和电导率作为鉴定技术来确认这些复合材料的结构。XRD衍射图谱和FT - IR光谱为复合材料的形成提供了有力证据。引入的混合纳米填料的量对纯EPYR的热、导电和涂层性能有显著影响。纯EPYR和EPYR/GNP/MWCNT在400 - 410℃范围内比其他材料表现出更高的热稳定性。与其他材料相比，EPYR/GNP/MWCNT的热稳定性也显著提高。 代表检查10%重量损失时的温度。纯EPYR及其相关的EPYR/GNP/MWCNT在 温度（330±4℃）下表现出相似的热稳定性。通过扫描电子显微镜（SEM）和透射电子显微镜（TEM）检查形态特征；这些特征表明纳米复合材料组分具有极高的相容性。EPYR/GNP/MWCNT配方的电导率值有显著提高。此外，通过吸水率实验和电化学阻抗测试了EPYR的涂层性能；两项测试均证明，由于离子电荷转移电阻和提高的阻隔性能，混合GNP/MWCNT纳米填料显著改善了纯EPYR涂层。在测量的组成值中，EPYR/GNP/MWCNT的涂层电阻变化值（CRv）最高，紧随其后的是EPYR/GNP/MWCNT和EPYR/GNP/MWCNT的涂层电阻变化值。
