The recent ability of material scientists in the control of matter behaviour at nanoscale level can be exploited to design a new generation of emerging materials able to simultaneously satisfy several structural and functional requirements. Very low content of electrical conductive nanoparticles embedded in epoxy resin, or introduced between-lamina interfaces, can help for example to address limitations related to the electrical and thermal insulating properties which negatively impact on the design of anti-lightning properties, anti-icing systems and thermal dissipation phenomena. Recent developments, in the field of structural composites, highlight the relevant property of carbon nanoparticles in providing a very effective strategy to fulfill industrial requirements related to the damping control. It is well known that vibrations must be minimized by appropriate design features through active and/or passive damping treatments in order to improve aircraft performance and reliability levels of structures and systems. Passive damping treatments in composites as a result of the application of embedded viscoelastic materials (which possess an intrinsic capacity of dissipating mechanical energy) reveal greater advantages in terms of energy efficiency and reliability of machines/structures compared to active systems. Recent developments on nanotechnology have shown that the addiction of CNT in epoxy resins modify the stiffness and damping properties as a consequence of variation of the epoxy 3D network structure. This phenomena, called damping enhancement via stick-slip mechanism, is strictly related to the non-ability of the CNT to fully adhere to epoxy matrices and to the load transfer from epoxy to nanotubes. A lack of adhesion and load transfer causes slippage of CNT which results in enhanced damping characteristics. The work hereby described regards the design of multifunctional epoxy mixtures, based on carbon nanoparticles, with enhanced damping features. Dynamical-mechanical analysis (DMA) highlights that the inclusion of the nanofiller in the resin causes a variation in the phase composition of the epoxy matrix. In particular, the impossibility to extend the tri-dimensional network in the space filled by the nanoparticles is responsible of a more mobile phase responsible of a better behaviour in the damping performance. The effectiveness of this strategy can be further improved by suitable control of the resin chemical composition. A deep control of composition and interactions between carbon nanoparticles and matrix can provide an effective strategy to enhance the damping performance of nanofilled composites.
|Titolo:||Tuning The Interaction Between Carbon Nanoparticles And Epoxy Matrix For Improving Multi-Functionality Performance Of Structural Nanocomposites|
|Data di pubblicazione:||2017|
|Appare nelle tipologie:||4.1 Contributi in Atti di convegno|