Polyurethane graphene nanocomposites with self-healing properties by azide-alkyne click reaction

Biodegradable Polyurethane Solid‐Solid Phase Change Materials

“…[35] In Figure 1c, the characteristic peaks À NCO band, C=O stretching band and C-NH stretching band at 2270, 1719 and 1574 cm À 1 carried through by the reaction between PEG and IPDI, respectively. [36] Also, CÀ N stretching and NÀ H bending were located at 1348 and 1252 cm À 1 . [37] After the reaction of the prepolymer with octadecanol the NCO band at 2270 cm À 1 was completely disappeared (Figure 1d).…”

A Self-Healing Material Based on Microcapsules of Poly(Urea-Formaldehyde)/Bis-Propargyl-Succinate Containing in Polyurethane Matrix

“…Gragert et al (15) conducted an investigation of two different healing agents (azide and alkyne compounds)-contained capsules on a highmolecular-weight poly(isobutylene) matrix, resulting that the specimens could be recovered after 5 days at 25 °C (91%) or 3 days at 60 °C (107%) through the shear-induced click crosslinking. Akhan et al (16) preformed a survey of one healing agent (azide compound)-contained capsule on an alkyne-graphene oxide matrix with the use of CuAAC click reaction, leading to improving the self-healing efficiency through an incorporation of the low molecular weight selfhealing agent within the microcapsule. Besides, Saikia et al (18) designed an azide-alkyne cycloaddition-based SHMs through azide-multiwall carbon nanotubes with poly(t-butyl acrylate) and alkyne compound-contained capsule embedded in an epoxy matrix, manifesting that this SHM recovered as much as 65% of its original fracture toughness.…”

“…Thus, this is a precondition to continue conducting an investigation of PU/MCs-based SHMs in this study, as well as which can be a novel SHMs on the basic of "azide-alkyne" click reaction between an azide group-contained polymeric matrix (the as-prepared GAP-based PU) and a terminal alkyne compound-contained healing agent (the as-prepared BPS). Specifically, it uses only one type of healing agent (alkyne compound)contained capsule instead of two different healing agents (azide and alkyne compounds)-contained capsules on a polymeric matrix (polyisobutylene) by Gragert et al (15), or one healing agent (the azide compound)-contained capsule on a polymeric matrix (alkyne-graphene oxide) with the use of copper-catalyzed azide-alkyne (CuAAC) click reaction by Akhan et al (16). As limitation of the use of CuAAc regrading to diffusion of the participating reactants, Dohler et al (17) performed more extensively in variety of multivalent azide/alkyne compounds and polymers grafted with various molecular weights, viscosities, and functional group densities.…”

Monitoramento de artigos sobre a utilização de nanocompósitos com matriz de poliuretano aplicados à engenharia de tecidos para o reparo ósseo

“…Os PU´s do tipo arcabouço são bastante utilizados na engenharia de tecidos, na forma de nanocompósitos, a partir da incorporação de hidroxiapatita de cálcio na sua matriz polimérica que lhe confere propriedades bioativas e regeneração do tecido ósseo (Singh et al, 2020). Na síntese de nanocompósitos, nanomateriais são incorporadas em uma matriz, seja ela polimérica, cerâmica ou metálica, para melhorar suas propriedades, sendo elas, resistência, dureza, estabilidade térmica e leveza, os nanomateriais incorporados podem ser nanopartículas orgânicas, inorgânicas e poliméricas (hidroxiapatita, argila, grafeno e nanopartículas metálicas) (Akhan, Oktay, Özdemir, Madakbaş, & Apohan, 2020;Asadi et al, 2017).…”