Temperature modulated polymer nanoparticle bonding: A numerical and experimental study

摘要: Abstract In this research, we investigated the impact of nanoparticle adhesive properties on size micro-clusters formed during shear-induced aggregation at different temperatures. To precisely control particle adhesion, used nanoparticles with a core-shell structure, where core is composed polymethyl methacrylate and shell combination polybutylacrylate. Due to significantly glass transition temperature (Tg) these polymers, act as hard-sphere, while presence polybutylacrylate in shell, 50 °C, gives surface mechanical softness upon increasing temperature. We observed that aggregates grow when rises above Tg, indicating an increase force between nanoparticles. Under conditions, exhibits from plastic viscous behavior allows bond physically contact controlled coalescence effect. further investigate micro-mechanical aggregation, numerical study simple shear flow setup using CFD-DEM customized interaction model was carried out. This has capability describe non-contact well forces present colloidal systems. Depending system temperature, can simulate either elastic, elastic-plastic or viscoplastic deformation interacting Using feature, it demonstrated possible reproduce experimentally growth rise by simulating adhesion primary parameters. Furthermore, results clearly demonstrate direct relation macroscopic system.