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Xu FJ, Zhao JP, Kang ET, Neoh KG, Li J: Functionalization of nylon membranes via surface-initiated atom-transfer radical polymerization. Langmuir. 2007 Jul 31;23(16):8585-92. Epub 2007 Jul 10.
The ability to manipulate and control the surface properties of nylons is of crucial importance to their widespread applications. In this work, surface-initiated atom-transfer radical polymerization (ATRP) is employed to tailor the functionality of the nylon membrane and pore surfaces in a well-controlled manner. A simple two-step method, involving the activation of surface amide groups with formaldehyde and the reaction of the resulting N-methylol polyamide with 2-bromoisobutyryl bromide, was first developed for the covalent immobilization of ATRP initiators on the nylon membrane and its pore surfaces. Functional polymer brushes of 2-hydroxyethyl methacrylate (HEMA) and poly (ethylene glycol) monomethacrylate (PEGMA) were prepared via surface-initiated ATRP from the nylon membranes. A kinetics study revealed that the chain growth from the membranes was consistent with a "controlled" process. The dormant chain ends of the grafted HEMA polymer (P (HEMA)) and PEGMA polymer (P (PEGMA)) on the nylon membranes could be reactivated for the consecutive surface-initiated ATRP to produce the corresponding nylon membranes functionalized by P (HEMA)-b-P (PEGMA) and P (PEGMA)-b-P (HEMA) diblock copolymer brushes. In addition, membranes with grafted P (HEMA) and P (PEGMA) brushes exhibited good resistance to protein adsorption and fouling under continuous-flow conditions. |
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