Effect of particle structure and surface chemistry on PMMA adsorption to silica nanoparticles.

摘要: The interphase layer of polymers adsorbed to silica surfaces can be affected by the surface silanol density as well relative size polymer compared with adsorbing substrate. Here, nonequilibrium adsorption PMMA onto individual colloidal Stober (SiO(2)) particles, where R(particle) (100 nm) > R(PMMA) (approximately 6.5 was fumed silica, (7 approximately (6.5 < R(aggregate) 1000 nm), a function both [SiOH] and hydrophobility. In former case, TEM images showed that nanoparticles, so number chains/bead could calculated, whereas in latter case bridging between aggregates occurred. anchoring point densities were comparable densities, suggesting trains rather than loops. For hydrophilic SiO(2), T(g) increased [SiOH], more carbonyl groups hydrogen bonded silanols, independent particle morphology. methylated (CH(3))(3)SiO(2), isotherms identical for but depressed former, bulk value latter. (CH(3))(3)SiO(2) attributed larger loops formed chains aggregates.