Structural Estimation of Particle Arrays at Air-Water Interface Based on Silica Particles with Well-Defined and Highly Grafted Poly(methyl methacrylate)

摘要

Silica nanoparticles with well-defined, highly grafted dense poly(methyl methacrylate) (MMA) were prepared by surface-initiated activators regenerated by electron transfer for atom transfer radical polymerization (ARGET ATRP) of methyl methacrylate with an initiator-fixed silica particle in the presence of air. Two different polymerizations of MMA were carried out under the same conditions using tris[2-(dimethylamino)ethyl]-amine (Me^sub 6^TREN) and N,N,N',N',N''-pentamethyldiethylene-triamine (PMDETA) as the ligand, respectively. In the CuCl^sub 2^/PMDETA system, polymerization appeared to be more controlled with a lower polydisperisty compared with the CuCl^sub 2^/Me^sub 6^TREN system. The monolayer of these particles was formed at the air-water interface using Langmuir-Blodgett (LB) technique. Multilayers of the particles were fabricated by repetition of LB depositing. A surface pressure-area (π-A) measurement and SEM observation were used to characterize the particle arrays. [PUBLICATION ABSTRACT]