Chemo‐rheological and quantitative dispersion analysis of mass‐produced graphene‐unsaturated polyester based nanocomposites

Abstract Recent advancements in mass production of graphene powders utilize less energy‐intensive methods and milder chemicals compared to traditional lab‐scale techniques. This can influence the properties of the resulting graphene particles. This study investigates the effect of mass‐produced graphene powder on the curing and rheological properties of a resin transfer molding (RTM) grade unsaturated polyester resin. An objective dispersion quantification method was established to track the dispersion state of the nanocomposite throughout the curing process. The findings reveal that the graphene powder accelerated the curing evidenced by a shift in the peak temperature and gel point towards lower values. The sample containing 1 wt.% graphene exhibited remarkable dispersion stability with only 7.1% decrease by gelation. The resin matrix's low viscosity enhanced graphene particles mobility, while its fast‐curing nature allowed less time for agglomeration. Highlights Characterization of unsaturated polyester nanocomposites modified with an industrial‐grade graphene powder Real‐time in‐situ monitoring of graphene's dispersion state Quantification dispersion analysis for an objective dispersion assessment