The load-displacement curves of both control composite and reinforced composites with electrospun MWCNTs nanofibers reveals the mechanical performance. The incorporation of MWCNTs-epoxy nanofibers between the plies results in an enhancement of the load bearing and strength of the composites using MWCNTs. The maximum loads increased by up to 22% for MWCNTs-epoxy nanofiber composites. The short-beam strength obtained at each MWCNTs reveals that there is an increase of 21% in interlaminar strength for electrospun MWCNTs-epoxy.
The BVID results revealed a significant improvement in damage resistant by employing electrospun nanofibers between the layer of composites. There is a 7.44 J increase in energy threshold by impact with adding MWCNTS/epoxy nanofibers.
The failure resistance were increased up to 100% at the maximum baseline load by adding the electrospun MWCNTs. The life cycle of the composites also has been increased by 90% of load.
The electrical conductivity of the composites has been increased by up to 13% by imbedding electrospun nanofiber mats incomposite structures. It is important while higher electrical conductivity reduces the damage cause by lightening, especially in aerospace applications.
By adding the electrospun MWCNTs a 20% increase in EMI shielding of the composite has been achieved. It was reported SET close to 30 dB at X-band frequency consider as an adequate level of shielding in many applications
Manufacturing of submicron CNT-Epoxy Nanocomposite Filaments
The removal of sacrificial polymer post electrospinning with minimal negative influence on the resin properties has been a major challenge making it close to impossible to achieve. Here, a structural epoxy resin which is widely in use in aerospace industry has been carefully mixed with carbon nanotube reinforcements via a novel mixing strategy. All variables such as solution parameters (i.e., polymer concentration, viscosity, conductivity, and surface tension), the processing parameters (i.e., applied voltage, distance between the capillary tip and collector, flow rate of the polymer solution), and the ambient parameters (i.e., temperature and humidity) have been carefully considered for optimizing nanofiber morphology.
Enhancing the Interlaminar Shear by CNT Scaffolds
A new scientific approach has been generated to increase the spinnability of a thermosetting polymer enabling production of a novel nanofiber. Our prime objective of producing epoxy nanocomposite fibers is for structural applications due to their exceptional mechanical and thermal properties. We also believe that due to the resulted dispersed and aligned nano reinforcements such as carbon nanotubes (CNTs) or any other nanomaterials, these hybrid fibril composites will have huge surface area as well as a surface compatibility to be used with epoxy matrices in advance composite applications. No presence of co-polymer or solvent residue in final electrospun fiber ensures achieving the expected advancement in mechanical properties.