Performance of graphite filled composite based on benzoxazine resin

Abstract

In this study, we aimed to prepare and characterize graphite filled composites based on benzoxazine resin for the bipolar plate in fuel cell. Three kinds of graphite (synthetic graphite, natural graphite, and expanded graphite) were used for the preparation of the graphite filled composites. The composites were prepared by means of the compression molding of mixtures of graphite and benzoxazine resin. The properties of the graphite filled composites based on benzoxazine resin were estimated by mechanical property, gas permeability, and electrical conductivity. As a result, it was found that graphite filled composites based on benzoxazine resin showed good gas impermeability, electrical conductivity and mechanical property compared with those of the graphite filled composites based on the conventional phenolic resin.

Synthesis and characterization of a cured epoxy resin with a benzoxazine monomer containing allyl groups

“…The storage modulus and T g increased with increasing VB‐a content in the epoxy/VB‐a copolymer system. In a previous copolymer network system [epoxy/2,2‐bis(3,4‐dihydro‐3)‐phenyl‐1,3‐benzoxazine)propane (Ba) = 50/50],36 the T g behavior was around 150–160°C. In our study, epoxy/VB‐a = 50/50 showed a significantly higher T g , at about 204.2°C; the introduction of the allyl group as a crosslinking site into polybenzoxazines improved the rigidity of the polymer and increased the crosslinking density (the rubbery plateau modulus increased with increasing VB‐a content).…”

Highly filled graphite polybenzoxazine composites for an application as bipolar plates in fuel cells

“…Kimura et al utilized three kind of graphite i.e., synthetic graphite, natural graphite, and expanded graphite, for the preparation of graphite/polybenzoxazine composites at the fixed graphite content of 80 wt %. It was found that the polybenzoxazine composites showed superior gas impermeability and mechanical property to conventional graphite/phenolic composites while electrical resistivity value as low as 2.2 mΩ cm from the graphite/polybenzoxazine composite was achieved . However, the thermal properties such as thermal conductivity, thermal diffusivity, glass transition temperature, as well as thermal degradation behaviors of the graphite filled polybenzoxazine, which are also crucial for the successful bipolar plate application were not reported in their study.…”

Functionalization of lignin: Synthesis of lignophenol‐graft‐poly(2‐ethyl‐2‐oxazoline) and its application to polymer blends with commodity polymers

“…These results clearly indicated that LP‐ graft ‐POZO and PVC were completely miscible, forming a single phase. Kobayashi et al reported that poly(2‐oxazoline) is slightly basic and highly polar because of the amide groups present on their side chains 30. Therefore, poly(2‐oxazoline)s may be miscible with PVC (primary miscibility), where PVC is slightly acidic and PVC is derived from chloride groups.…”

“…We succeeded in developing a phase‐separation system (2‐step process II) that can produce processable and organosoluble lignophenol (LP) 21–26. The structure of LP is similar to that of artificial phenolic resins,27–37 which are often used as plastics, adhesives, cures, etc. Being a natural polymer‐based plastic, LP is considered to be a substitute for commodity polymers derived from fossil fuels.…”