Reactive graphene by one-pot grafting toward tough and fire-retardant thermoset nanocomposites

• DOI: 10.1016/j.surfin.2022.102311
• Publication Date: 2022-09-03T03:41:23Z
• Authors: Jidi Li; Yuanchao Liu; Sihao Qian; Zhi Geng; Qichao Pan; Lisha Ye; Lianwang Zhang; Jianwen Bao; Yong He; Bo Zhu
• Keywords: Thermosetting polymer

Functionalized graphene with reactive moieties is promising to significantly enhance the interfacial strength of materials thermoset resins and their dispersion in resins. Most previous were prepared through covalent modification oxidation-produced oxygen-containing groups oxides, which, however, have intensive defects weakened mechanical strength, Young's modulus, thermal stability. Starting from commercially available graphene, we herewith developed a one-pot direct grafting approach for fabrication epoxy-reactive graphene. This achieved by diazonium addition reaction 10-(2′,5′-dihydroxyphenyl)-9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (ODOPB) functionalized 4-aminobenzoic acid pristine sheets. We further demonstrated this could be controlled well simply changing ODOPB concentration fine-tune density. In reinforced epoxy composite, grafted onto graphenes act as anchors, ensuring improved The composites dramatically enhanced fracture toughness (a critical-stress-intensity factor, KIC value 2.1) than graphene-epoxy 1.3) neat material 1.8). Furthermore, its flame retardance, evaluated limit oxygen index (LOI) tests, 29.5%. provides an easily up-scalable efficient enhancing dispersibility incorporating new functions into polymer nanocomposites carriers.