Hierarchical comb brush architectures via sequential light‐mediated controlled radical polymerizations |
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| Authors: | Benjaporn Narupai Justin E Poelma Christian W Pester Alaina J McGrath Edward P Toumayan Yingdong Luo John W Kramer Paul G Clark Paresh C Ray Craig J Hawker |
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| Affiliation: | 1. Department of Chemistry and Biochemistry, University of California, Santa Barbara, California;2. Materials Research Laboratory, University of California, Santa Barbara, California;3. Materials Department, University of California, Santa Barbara, California;4. Department of Chemical Engineering, University of California, Santa Barbara, California;5. The Dow Chemical Company, Midland, Michigan;6. Department of Chemistry, Jackson State University, Jackson, Mississippi |
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| Abstract: | A novel strategy for the synthesis and characterization of branched polymer brushes by sequential light‐mediated controlled radical polymerizations is described. Initially, linear brushes are prepared by surface‐initiated copolymerization of methyl methacrylate and 2‐hydroxyethyl methacrylate (HEMA). In a subsequent step, the HEMA side chains are functionalized with initiating groups for secondary graft polymerization, leading to hierarchical, branched architectures. The increased steric bulk due to the polymer side chains results in a dramatic increase in film thickness when compared to the starting linear brushes. This strategy also allows chemical gradient and complex three‐dimensional structures to be obtained by employing grayscale photomasks in combination with controlled radical polymerization. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016 , 54, 2276–2284 |
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| Keywords: | copolymerization controlled radical polymerizations functionalization of polymers functionalization graft copolymers photopolymerization polymer architectures surfaces surface‐initiated polymerizations |
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