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Kim, Byeong-Su
Soft and Hybrid Nanomaterials Lab
Research Interests
  • Carbon materials, polymer, Layer-by-Layer (LbL) assembly, hyperbranched polymer, polyglycerol (PG), bio-applications


All-Star Polymer Multilayers as pH-Responsive Nanofilms

DC Field Value Language Kim, Byeong-Su ko Gao, Haifeng ko Argun, Avni A ko Matyjaszewski, Krzysztof ko Hammond, Paula T. ko 2014-11-10T01:30:45Z - 2014-11-07 ko 2009-01 -
dc.identifier.citation MACROMOLECULES, v.42, no.1, pp.368 - 375 ko
dc.identifier.issn 0024-9297 ko
dc.identifier.uri -
dc.identifier.uri ko
dc.description.abstract Star polymers with globular architecture and multiple arms are among the simplest forms of polymers with branched topologies. The combination of their unique architecture and high local densities of active functional groups makes star polymers unique candidates for a diverse range of applications. In this article, we describe the synthesis of star polymers with precisely controlled structures via atom transfer radical polymerization (ATRP) using the one-pot arm-first method. Specifically, two types of highly defined, high charge density star polymers with oppositely charged arm structures were prepared: poly[2-(dimefliylamino)ethyl methacrylate] (PDMAEMA) star and poly(acrylic acid) (PAA) star polymers with cross-linked cores. By exploiting the electrostatic interactions between the polyelectrolyte arms, we have integrated the PDMAEMA star and PAA star polymers within alternating multilayer thin films using layer-by-layer (LbL) assembly to generate all-star polyelectrolyte LbL films. The prepared star/star multilayer films illustrate nonuniform and nanoporous structures, which result from the characteristic architecture of star polymers. The thickness, porosity, and refractive index of star/star multilayer films are precisely tunable by assembly pH conditions. Furthermore, as-assembled star/star multilayer films exhibit distinct morphological changes by undergoing extensive structural reorganization upon post-treatment under different pH conditions that do not lead to any changes with their linear compositional counterparts; it is hypothesized that these differences are due to the star polyelectrolyte's compact structure and decreased extent of entanglement and interpenetration, which lead to a low degree of ionic cross-linking compared to their linear counterparts. The pH-responsive structural changes of the films are characterized by AFM, SEM, and FTIR. Finally, we have observed an enhanced ionic (proton) conductivity of star/star multilayers following the pH-induced structural reorganization. ko
dc.description.statementofresponsibility close -
dc.language ENG ko
dc.publisher AMER CHEMICAL SOC ko
dc.subject AFM ko
dc.subject Alternating multilayers ko
dc.subject Arm structures ko
dc.subject Atom-transfer radical polymerizations ko
dc.subject Compact structures ko
dc.subject Controlled structures ko
dc.subject Diverse ranges ko
dc.subject Electrostatic interactions ko
dc.subject Ethyl methacrylates ko
dc.subject FTIR ko
dc.subject Layer-by-layer assemblies ko
dc.subject Local densities ko
dc.subject Low degrees ko
dc.subject Morphological changes ko
dc.subject Multiple arms ko
dc.subject Nano-films ko
dc.subject Nano-porous structures ko
dc.subject Non-uniform ko
dc.subject One pots ko
dc.subject Pdmaema ko
dc.subject Ph conditions ko
dc.subject Ph-responsive ko
dc.subject Polyacrylic acids ko
dc.subject Post treatments ko
dc.subject Sem ko
dc.subject Star polymers ko
dc.subject Structural changes ko
dc.subject Structural reorganizations ko
dc.title All-Star Polymer Multilayers as pH-Responsive Nanofilms ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-61649091868 ko
dc.identifier.wosid 000262263200050 ko
dc.type.rims ART ko
dc.description.wostc 51 *
dc.description.scopustc 50 * 2015-05-06 * 2014-11-08 *
dc.identifier.doi 10.1021/ma801812v ko
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