Alhendal Abdullah
Department of Chemistry, Kuwait University P. O. Box 5969 Safat 13060 Kuwait
RSC Adv. 2024 Nov 5;14(48):35360-35372. doi: 10.1039/d4ra06831a. eCollection 2024 Nov 4.
Viscoelastic properties of thermo-set composites using an epoxy matrix reinforced with pristine CNT and silane-modified MWCNT at different concentrations (0%, 1%, 2% and 4%) were studied to observe the enhanced thermal and mechanical properties supplemented by the increased interfacial interaction due to CNT modification. The composite with pristine CNT was labeled as EPB-CNT, whereas that with silane-modified carbon nanotubes (CNTs) was referred to as ECB-CNT. The silanes used were glycidyloxypropyltrimethoxysilane (GPTS) and 3-aminopropyltriethoxysilane (APTES). Diglycidyl ether of bisphenol-A (DGEBA) was completely cured by Jeffamine D-400 to prepare EJ-0. The amine groups of the 3-aminopropyltriethoxysilane (APTS) partially cured the diglycidyl ether of bisphenol-A (DGEBA) in EAJ-0 by a sequential polymerization process, while the methoxy groups subsequently produced a silica network through the sol-gel method. Subsequently, Jeffamine D-400 was used as a curing agent at elevated temperatures for cross-linking and complete curing. EJ-0 and EAJ-0 were considered as neat films of EPB-CNT and ECB-CNT composites, respectively. Tensile and storage modulus tests, thermal property analysis using TGA, and microstructure characterization using field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), and TEM were all part of the study. Comparing composites with varying percentages and with neat films, the chemically bonded epoxy-silanized MWCNTs (ECB-CNTs) showed improved performance. ECB-CNT 4% had the highest tensile and storage modulus as well as improved thermal stability. Improved filler material distribution and fewer voids were found through microstructure analysis, strengthening the link between the reinforcement and matrix. The results underscore the potential applications of the CNT-enhanced nanocomposites in the engineering fields of automotive, aerospace, radar-absorbing materials and others. This marks a significant development in the field of composite technology to produce durable and effective materials.
研究了使用原始碳纳米管（CNT）和不同浓度（0%、1%、2%和4%）的硅烷改性多壁碳纳米管（MWCNT）增强的环氧基质热固性复合材料的粘弹性性能，以观察由于CNT改性导致界面相互作用增加而增强的热性能和机械性能。含有原始CNT的复合材料标记为EPB-CNT，而含有硅烷改性碳纳米管（CNT）的复合材料称为ECB-CNT。使用的硅烷是环氧丙氧基丙基三甲氧基硅烷（GPTS）和3-氨丙基三乙氧基硅烷（APTES）。双酚A二缩水甘油醚（DGEBA）通过Jeffamine D-400完全固化以制备EJ-0。3-氨丙基三乙氧基硅烷（APTS）的胺基通过连续聚合过程部分固化EAJ-0中的双酚A二缩水甘油醚（DGEBA），而甲氧基随后通过溶胶-凝胶法产生二氧化硅网络。随后使用Jeffamine D-作为高温固化剂进行交联和完全固化。EJ-0和EAJ-0分别被视为EPB-CNT和ECB-CNT复合材料的纯薄膜。拉伸和储能模量测试、使用热重分析（TGA）进行的热性能分析以及使用场发射扫描电子显微镜（FESEM）、原子力显微镜（AFM）和透射电子显微镜（TEM）进行的微观结构表征均属于该研究的一部分。将不同百分比的复合材料与纯薄膜进行比较，化学键合环氧硅烷化多壁碳纳米管（ECB-CNTs）表现出更好的性能。4%的ECB-CNT具有最高的拉伸和储能模量以及改善的热稳定性。通过微观结构分析发现填料材料分布得到改善且孔隙减少，加强了增强材料与基体之间的联系。结果强调了CNT增强纳米复合材料在汽车、航空航天、雷达吸波材料等工程领域的潜在应用。这标志着复合技术领域在生产耐用且有效的材料方面取得了重大进展。
