Covalently tethered well-defined new three-arm star hydrophilic poly(ethylene glycol) monomethacrylate (PEGMA) brushed nanoparticles on silicon surface have been successfully prepared by (i) synthesis a novel type of three-arm star-shaped preceding initiator, trifunctional hydroxy-based N-allyl-3,4,5-trihydroxybenzamide (NATHB), (ii) UV-induced hydrosilylation of NATHB with the hydrogen-termined Si(100) (Si-NATHB surface), (iii) coupling of 2-bromo isobutyrl bromide with the hydroxyl of NATHB by the esterification to provide the initiators (Si–NATHB–R3Br) for the subsequent ATRP, (iv) surface-initiated ATRP of PEGMA and 2-hydroxyethl methacrylate monomethacrylate (HEMA) to give the linear Si–NATHB–g–P(PEGMA) brushes and the Si–NATHB–g–P(HEMA) surface, (v) further coupling of 2-bromo isobutyrl bromide with the hydroxyl of P(HEMA) by the esterification to produce the macroinitiators (Si–NATHB–g–P(HEMA)-R3Br) and (vi) surface-initiated ATRP of PEGMA to give the comb-shaped Si–NATHB–g–P(HEMA)–g–P(PEGMA) brushes surface. Kinetics study indicated that the chain growth of P(PEGMA) and P(HEMA) from the functionalized silicon surfaces was consistent with a “controlled” or “living” process. The chemical composition and functionality of the silicon surface were tailored by the well-defined star linear and comb-shaped P(PEGMA) brushes, which provide with this type of surface structures formed in three brushes under conditions of spatial constraints imposed by their chemical connection to a single grafting site. XPS spectra testify that the linear and comb-shaped P(PEGMA) have been grafted on the Si-NATHB surface. AFM imaging of the hydrophilic polymer brushed nanoparticles imaged distinctive morphology when they were prepared into linear and comb-shaped brushes structure.
Well-defined amphiphilic graft polymer brushes containing fluoropolymer segments have been successfully prepared by (i) UV-induced coupling of 4-vinylbenzyl chloride (VBC) with the hydrogen-termined Si(100) (Si-VBC surface), (ii) surface-initiated atom transfer radical polymerization (ATRP) of 2-hydroxyethl methacrylate (HEMA) to produce the Si–VBC–g–P(HEMA) surface as the backbone of macroinitiator for further ATRPs, (iii) coupling of 2-bromoisobutyrl bromide with the HEMA polymer(P(HEMA)) by the esterification to produce the macroinitiators for the subsequent ATRP(Si–VBC–g–P(HEMA)-R3Br), (iv) surface-initiated ATRP of 2,2,3,3,4,4,4-heptafluorobutyl acrylate (HFBA) to produce the Si–VBC–g–P(HEMA)–g–P(HFBA) surface, and (v) the active P(HFBA) chain ends being used as the initiator for the subsequent ATRP of poly(ethylene glycol) monomethacrylate (PEGMA) to produce the amphiphilic Si–VBC–g–P(HEMA)–g–P(HFBA)–b–P(PEGMA) brush surface. The chemical composition and functionality of the silicon surface were characterised by X-ray photoelectron spectroscopy (XPS), atomic force microscope (AFM) and ellipsometry.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2025 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.