Guadagno Liberata, Lamberti Patrizia, Tucci Vincenzo, Vertuccio Luigi
Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II, 84084 Fisciano, Italy.
NANO_MATES, Research Centre for Nanomaterials and Nanotechnology at the University of Salerno, University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, Italy.
Nanomaterials (Basel). 2021 Mar 24;11(4):833. doi: 10.3390/nano11040833.
Epoxy resins containing multi-wall carbon nanotubes (MWCNTs) have proven to be suitable for manufacturing promising self-sensing materials to be applied in the automotive and aeronautic sectors. Different parameters concerning morphological and mechanical properties of the hosting matrices have been analyzed to choose the most suitable system for targeted applications. Two different epoxy precursors, the tetrafunctional tetraglycidyl methylene dianiline (TGMDA) and the bifunctional bisphenol A diglycidyl ether (DGEBA) have been considered. Both precursors have been hardened using the same hardener in stoichiometric conditions. The different functionality of the precursor strongly affects the crosslinking density and, as a direct consequence, the electrical and mechanical behavior. The properties exhibited by the two different formulations can be taken into account in order to make the most appropriate choice with respect to the sensing performance. For practical applications, the choice of one formulation rather than another can be performed on the basis of costs, sensitivity, processing conditions, and most of all, mechanical requirements and in-service conditions of the final product. The performed characterization shows that the nanocomposite based on the TGMDA precursor manifests better performance in applications where high values in the glass transition temperature and storage modulus are required.
含有多壁碳纳米管（MWCNTs）的环氧树脂已被证明适用于制造有前景的自传感材料，可应用于汽车和航空领域。为了选择最适合目标应用的体系，已对与主体基体的形态和力学性能相关的不同参数进行了分析。考虑了两种不同的环氧前体，四官能团的四缩水甘油基甲基二苯胺（TGMDA）和双官能团的双酚A二缩水甘油醚（DGEBA）。两种前体均在化学计量条件下使用相同的固化剂进行固化。前体的不同官能度强烈影响交联密度，直接影响电学和力学行为。考虑两种不同配方所表现出的性能，以便就传感性能做出最合适的选择。对于实际应用，可以根据成本、灵敏度、加工条件，最重要的是最终产品的机械要求和使用条件来选择一种配方而非另一种。所进行的表征表明，基于TGMDA前体的纳米复合材料在需要高玻璃化转变温度和储能模量值的应用中表现出更好的性能。
