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polymerchemistry.org 5 Ambiguous anti-fouling surfaces: Facile synthesis by light-mediated radical polymerization Christian W. Pester, Justin E. Poelma, Benjaporn Narupai, Shrayesh N. Patel, Gregory M. Su, Thomas E. Mates, Yingdong Luo, Christopher K. Ober, Craig J. Hawker, Edward J. Kramer In an attempt to create a polymer brush-based platform for the systematic study for anti-biofouling surfaces, the benefits of surface initiated, visible light-mediated radical polymerization are utilized to fabricate well-defined, chemically ambiguously patterned surfaces. A variety of analytical tools are used to illustrate the precise tuning of surface chemistry and thoroughly characterize spatially well-defined, hydrophilic/hydrophobic surfaces composed of poly(ethylene glycol methacrylate) and poly(trifluoroethyl methacrylate) with chemical definition on the micron scale. Advantages of both visible light-mediated photopolymerization and traditional copper-catalyzed atom transfer radical polymerization are combined to achieve both high spatial control and expanded monomer tolerance. DOI: 10.1002/pola.27748 Design of high-χ block copolymers for lithography William J. Durand, Gregory Blachut, Michael J. Maher, Stephen Sirard, Summer Tein, Matthew C. Carlson, Yusuke Asano, Sunshine X. Zhou, Austin P. Lane, Christopher M. Bates, Christopher J. Ellison, C. Grant Willson This report describes the design and synthesis of a series of lamella-forming, silicon-containing block copolymers (Si-BCPs) and evaluation of these materials as potential candidates for lithographic applications. The interaction parameter χ of each Si-BCP is measured by both the mean-field theory predicted order-disorder transition and by analysis of X-ray scattering profiles. The introduction of more-polar methoxy and less-polar methylsilyl moieties increases χ to about 2–3 times that of the reference material, poly(styrene-block−4-trimethylsilylstyrene). The incremental increases appear to be essentially additive in this family of block copolymers, suggesting that improvements in χ can be predicted from appropriate monomer choice. DOI: 10.1002/pola.27370 Investigation of intricate, amphiphilic crosslinked hyperbranched fluoropolymers as anti-icing coatings for extreme environments Jennifer S. Zigmond, Kevin A. Pollack, Sarah Smedley, Jeffery E. Raymond, Lauren A. Link, Adriana Pavía-Sanders, Michael A. Hickner, Karen L. Wooley An array of films composed of a third-generation hyperbranched fluoropolymer crosslinked with poly(ethylene glycol) is generated and tested as an anti-icing coating. Through variation of the hydrophilic:hydrophobic component ratios and drop-casting solvent, significant reductions in the water melting transition temperatures (−5 and −27 °C for free and bound water, respectively) are achieved. The novel application of this system displays the expansion and diversity of a well-established coating that demonstrates unique water confinement and sequestration behaviors with the ability to reorganize at the surface. DOI: 10.1002/pola.27800 Optimization of direct arylation polymerization (DArP) through the identification and control of defects in polymer structure Andrey E. Rudenko, Barry C. Thompson As a newly emerged protocol for the synthesis of conjugated polymers, direct arylation polymerization (DArP) is an environmentally friendly and cost-effective alternative to traditional methods of polymerization. DArP efficiently yields conjugated polymers with high yield and high molecular weight. However, DArP is also known to produce defects in polymer chemical structure. Together with molecular weight and polydispersity, these defects are considered to be important parameters of polymer structure and they have a strong impact on optical, electronic and thermal properties of conjugated polymers. DOI: 10.1002/pola.27279


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