The role of a biobased epoxy monomer in the preparation of diglycidyl ether of bisphenol A/MWCNT composites

Abstract

A biobased epoxy monomer (GA-II) derived from gallic acid for multiwalls carbon nanotubes' (MWCNTs) dispersion improvement is reported in this article. The aromatic group in its molecular structure made it to be absorbed onto the surface of MWCNTs via p-p interactions and the GA-II anchored MWCNT could be homogeneously dispersed in DGEBA matrix via sonication. That was proved by Raman and UV spectroscopy as well as scanning electron microscope. After curing reaction, the epoxy/MWCNT composites demonstrated enhanced mechanical properties, excellent thermal conductivity, and high electrical conductivity. With the addition of only 0.5 wt% GA-II modified MWCNT, the tensile strength, tensile modulus, flexural strength, and flexural modulus of the composites were improved by 28%, 40%, 22%, and 16%, respectively. The thermal and electrical conductivities were also improved from 0.15 to 0.25 W/m K (67% increased) and from 0.7 3 10 214 to 0.24 3 10 24 S cm 21 (10 orders increased)

Highly Electrically Conductive Nanocomposites Based on PolymerInfused Graphene Sponges

“…Based on our knowledge, the electrical conductivity of GSepoxy produced in this work is at least one order of magnitude higher than the best electrical conductivity of grapheneepoxy composites with similar filler content ever reported Table 1. For the grapheneepoxy composites prepared with traditional methods222324252627, it is difficult to obtain interconnected graphene network and achieve the electron percolation at low filler content due to the hindering of polymer chain. The good electrical conductivity of GSepoxy reported in this work attribute to the compactly interconnected graphene network constructed in the polymer matrix as proved at discussion section.…”

Flame Retardant Epoxy Derived from Tannic Acid as Biobased Hardener

“…Because it has less conjugated and simple structure than condensed tannins, it has some advantages that it is soluble in organic solvents and facilitates the fabrication of plastics . TA and its derivatives have been previously used as a monomer and an additive for epoxy resins which were made by functionalizing the TA with oxirane group. − Lang et al also used the TA as a coating material for a low flammable epoxy foam . In this study, TA as a multifunctional and flame retardant epoxy hardener was reacted with diglycidyl ether of bisphenol A (DGEBA) for flame retardant epoxy resin.…”

Recent development on bio‐based thermosetting resins

“…105 Coatings and composites are major downstream applications of epoxy resins, and different kinds of biobased epoxy resins were studied as resin matrix, such as 2,5-furandimethanol, 106 resorcinol, 107 and gallic acid. [108][109][110] Among them, the carbon nanotubes or graphene reinforced gallic acid-based epoxy resin was proved to possess better mechanical properties, excellent thermal conductivity and electrical conductivity. 109,110…”

“…[108][109][110] Among them, the carbon nanotubes or graphene reinforced gallic acid-based epoxy resin was proved to possess better mechanical properties, excellent thermal conductivity and electrical conductivity. 109,110…”