Novel porous nanohybrid materials with unexpected mechanical and electrical performance by pyrolysis of carbon nanotube-filled benzoxazine thermosets

Dumas, Ludovic; Bonnaud, Leïla; Dubois, Philippe

doi:10.1080/20550324.2016.1254927

Cited by 3 publications

(2 citation statements)

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“…DDS ligand may play a meaningful role as an additional hardening agent for epoxy curing systems at the interface nanofiller/matrix. Furthermore, recently, enormous attention has been paid to the addition of CNTs in polybenzoxazines in order to improve the performance of the corresponding nanocomposites [37][38][39][40][41][42][43][44][45]. It has been found that it is possible to obtain a hardened network characterized by extraordinary thermo-mechanical properties as a consequence of the inherent interactions between the CNTs and a benzoxazine resin [33,40,41].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, recently, enormous attention has been paid to the addition of CNTs in polybenzoxazines in order to improve the performance of the corresponding nanocomposites [37][38][39][40][41][42][43][44][45]. It has been found that it is possible to obtain a hardened network characterized by extraordinary thermo-mechanical properties as a consequence of the inherent interactions between the CNTs and a benzoxazine resin [33,40,41]. The polydimethylsiloxane (PDMS) polymer used in combination with benzoxazine (Bz) resin to form polydimethylsiloxane-benzoxazine prepolymer (PDMS-Bz) allows improving the mechanical and thermal properties of the final epoxy nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

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Multifunctionality of structural nanohybrids: the crucial role of carbon nanotube covalent and non-covalent functionalization in enabling high thermal, mechanical and self-healing performance

et al. 2020

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This study proposes new kinds of functionalization procedures able to preserve specific properties of carbon nanotubes (CNTs) and to improve compatibility with the epoxy matrix. Through a covalent approach, for the first time, CNTs are functionalized with the same hardener agent, 4,4′-diaminodiphenyl sulfone, employed to solidify the epoxy matrix and capable to fulfill mechanical requirements of industrial structural resins. The same CNTs are non-covalently modified through the polymer wrapping mechanism with benzoxazine (Bz) terminated polydimethylsiloxane (PDMS). The comparison between electrical and mechanical properties of the nanocomposites highlights the success of the non-covalent functionalization in determining an increase in the glass transition temperature (Tg) and in better preserving the unfunctionalized CNT electrical conductivity. Besides, tunneling atomic force microscopy (TUNA), powerful to catch ultra-low currents, has been used for revealing the morphology on nanoscale domains and detecting the conductivity on the same location of CNT/epoxy resins. No electrical contacts to the grounds have been used for the TUNA analysis; a procedure that does not alter the results on the interface domains which experience contact areas with strong differences in their properties. The effectiveness of performed CNT functionalizations as a route to impart self-healing efficiency to the resin formulations has also been proved.

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