Search

A photolatent base ((1,5-diazabicyclo [4.3.0]non-5-ene) DBN ) is used for the first time as photocatalyst for the curing of a formulation, which undergoes crosslinking by Michael addition reaction between acetoacetate and acrylate groups together with the reduction of graphene oxide. The reduction degree of graphene oxide during in situ irradiation is monitored by XPS analysis. The effect of the graphene oxide concentration on the photopolymerization reaction is studied by RT-FTIR. The thermal properties of the composite are determined by DSC analyses. The crosslinked nanocomposite showed a decrease of one order of magnitude for the electrical resistance in the presence of 3 wt% of graphene oxide. In addition, the thermal conductivity is significantly increased by the in situ reduction of graphene oxide in the organic matrix catalyzed by the phototriggered base. [ABSTRACT FROM AUTHOR]

Wearable wire-shaped supercapacitors were fabricated exploiting an innovative graphene aerogel self-assembly procedure on copper wire. The innovative aspect of the proposed procedure lies in the employment, for the first time to the best of our knowledge, of a hydrothermal graphene synthesis for an in situ coverage of a non-planar substrate. Specific capacitance per unit length was calculated to be about 12,5 mF/cm. The device can sustain repeated charge–discharge and bending cycles without suffering significant deterioration of specific capacitance. The combination of graphene aerogel self-coating method, flexibility and superior electrochemical performance makes the proposed device a suitable power source for e-textile applications. [ABSTRACT FROM AUTHOR]

Photolatent DBN derivatives were shown to be suitable catalysts for the in-situ preparation of novel organic-inorganic hybrid coatings. The formulations are based on organic resins crosslinked by a Michael reaction between acetoacetate modified oligomers and acrylic components, and an inorganic precursor undergoing a base-catalyzed sol–gel reaction. The size of the inorganic nanoparticles can be controlled by the addition of suitable coupling agents, thus allowing the design of hybrid coatings with optimized mechanical properties such as scratch resistance. [ABSTRACT FROM AUTHOR]