Polybenzoxazine/single-walled carbon nanotube nanocomposites stabilized through noncovalent bonding interactions

Bifunctional polybenzoxazine nanocomposites containing photo-crosslinkable coumarin units and pyrene units capable of dispersing single-walled carbon nanotubes

“…1-Nitropyrene was synthesized using a previously reported procedure. 21 SWCNTs were purchased from Center for Biochemical Technology.…”

“…20g We have also proposed a pyrene-based benzoxazine precursor that forms PBZ/CNT nanocomposites stabilized through strong π-π interactions between the pyrene units and CNT surfaces. 21 Coumarins, cinnamic acids, and cinnamic esters display promising behavior as compounds capable of undergoing photoinduced crosslinking. 24 Upon irradiation at wavelengths greater than 310 nm, a coumarin moiety will undergo dimerization through [2π + 2π] cycloaddition to afford a crosslinked network, while de-crosslinking will occur upon irradiation at wavelengths of less than 260 nm.…”

An investigation on the effect of phenylboronic acid on the processibilities and thermal properties of bis-benzoxazine resins

“…This means the curing reaction of PBBZ-b does not occur at 140°C. After cured at 180°C for 2 h, the intensity of the absorption peaks at 941 cm −1 for oxazine ring, at 1146 cm −1 for C-N-C bending mode of the maleimide ring, and at 1032 cm −1 for the symmetric stretching vibration of C-O-C gradually reduces owing to the ring-opening reactions [34]. When the curing temperature further increases to 200°C, the absorption of these bands almost disappears.…”

H-bonding supramolecular interactions driving the dispersion of kaolin into benzoxazine: A tool for the reinforcement of polybenzoxazines thermal and thermo-mechanical properties

“…The reinforcement strategy of benzoxazine resins generally relies on the use of polyhedral oligomeric silsesquioxanes (POSS) [10][11][12], clay minerals [13][14][15][16][17][18] or carbon nanotubes [19][20][21][22][23], which have been extensively used as polymer fillers. Regarding clay minerals, a traditional organomodification approach is employed to promote clay dispersion in benzoxazine.…”

“…This strategy relies on the exchange of the clay inter-platelets cations by a reactive and organophilic cation to enhance benzoxazine monomers diffusion within clay platelets and therefore polymer growing to reach an exfoliated state [17,18,24,25]. Recent works on carbon nanotubes/polybenzoxazine composites raise interests onto convenient composites preparations based on p-p supramolecular interactions [19,21,22], leading to outstanding reinforcement of materials. Conscious of these strong interactions driving the properties of polybenzoxazines network, it appears clear that using supramolecular interactions for the reinforcement of PBZ matrix is a facile and efficient strategy.…”