A comparative study on long term stability of self-healing epoxy coating with different inorganic nanotubes as healing agent reservoirs

Abstract

Abstract. Self-healing epoxy coatings were prepared with different nanotubes as reservoirs for epoxy monomer (healing agent). The nanotubes selected for the current study were TiO 2 nanotubes with two different tube diameter (TNT1 and TNT2) and naturally occurring hallyosite nanotubes (HNT). These self-healing coatings were subjected to accelerated weathering exposure. The weathering stability of the coatings were observed. The surface morphology, chemical changes and surface roughness were studied as a function of weathering exposure period. These studies confirmed that the long term stability of the coatings highly depend on the nanotube parameters such as nature, surface area and diameter. It was found that the photocatalytic degradation of epoxy matrix with TiO 2 nanotubes was prominent in TNT1 filled coating compared with their TNT2 variant. The higher possibility of exposure of epoxy monomer encapsulated inside both HNT and TNT2 facilitated the cure reaction with UV light to create new chains during weathering.

Self-Healing Performance of Multifunctional Polymeric Smart Coatings

“…In case of nanocomposite coatings (Figure 5d), the peaks at 827, 919, 1037, 1452, 1508, and 2922 cm −1 are assigned to oxirane, stretching of oxirane, stretching of C–O–C of ether, –CH 3 deformation, and C–C aromatic, respectively, which are in accordance with the previous results [45,46,47]. The FTIR analysis confirms the successful loading of NaNO 3 into HNTs and encapsulation of linseed oil in UFMCs leading to the development of nanocomposite coatings upon their reinforcement into the epoxy matrix.…”

Corrosion Resistance Synergistic Appraisal of Titanium-Impregnated Bisphenol A-Type Epoxy Duplex Coating System in Stimulated and Natural Marine Environments of Southeastern Coastal Area of China–Pakistan Economic Corridor

“…These findings are consistent with the previous literature [42,43,50,52,53]. It has been reported that the decrease in the band intensities, chain scissoring, and loss of cross-linkage occur due to weathering of the epoxy coating in the natural environment [54][55][56][57]. Bellenger and Verdu has reported the formation of ketone products by the carbonyl band at 1728 cm −1 , while Paterson has reported the aldehyde-based products [58,59].…”