The hydrogen-terminated Si (100) (SiH surface) was functionalized by coupling with 4-vinylbenzyl chloride (VBC) to form a SiVBC surface, which serves as macroinitiators for the surface-initiated aqueous atom transfer radical polymerization (ATRP) of 2-hydroxyethyl methacrylate (HEMA) and poly(ethylene glycol)methacrylate (PEGMA) to prepare SiVBCgPHEMA and SiVBCgPPEGMA substrates, respectively. The ellipsometric results revealed that the surface-initiated ATRP of both PHEMA and PPEGMA brushes proceeded in a controlled fashion. By adjusting the monomer concentration, an eccentric polymer thickness dependence on the initial monomer concentration [M]0 was observed for both HEMA and PEGMA, i.e., in the dilute regime, the thickness of the polymer film increases with the increase in [M]0; however, beyond critical [M]0, the thickness deceases gradually with the further increase. Such an eccentricity was tentatively correlated to the counteractive combination of the increase in [M]0 and decrease in the apparent polymerization rate constant. Both SiVBCgPHEMA and SiVBCgPPEGMA substrates were esterified for the subsequent surface-initiated ATRP, resulting in corresponding comb-like brushes. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 2590–2599, 2006
If you can't find a tool you're looking for, please click the link at the top of the page to "Go to old article view". Alternatively, view our Knowledge Base articles for additional help. Your feedback is important to us, so please let us know if you have comments or ideas for improvement.