Thermoresponsive PNIPAAM bottlebrush polymers with tailored side-chain length and end-group structure

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dc.citation.firstpage2008en_US
dc.citation.journalTitleSoft Matteren_US
dc.citation.lastpage2015en_US
dc.citation.volumeNumber10en_US
dc.contributor.authorLi, Xianyuen_US
dc.contributor.authorShamsiJazeyi, Hadien_US
dc.contributor.authorPesek, Stacy L.en_US
dc.contributor.authorAgrawal, Adityaen_US
dc.contributor.authorHammouda, Boualemen_US
dc.contributor.authorVerduzco, Rafaelen_US
dc.date.accessioned2014-07-23T15:30:35Zen_US
dc.date.available2014-07-23T15:30:35Zen_US
dc.date.issued2014en_US
dc.description.abstractWe explore the phase behaviour, solution conformation, and interfacial properties of bottlebrush polymers with side-chains comprised of poly(N-isopropylacrylamide) (PNIPAAM), a thermally responsive polymer that exhibits a lower critical solution temperature (LCST) in water. PNIPAAM bottlebrush polymers with controlled side-chain length and side-chain end-group structure are prepared using a ﾓgrafting-throughﾔ technique. Due to reduced flexibility of bottlebrush polymer side-chains, side-chain end-groups have a disproportionate effect on bottlebrush polymer solubility and phase behaviour. Bottlebrush polymers with a hydrophobic end-group have poor water solubilities and depressed LCSTs, whereas bottlebrush polymers with thiol-terminated side-chains are fully water-soluble and exhibit an LCST greater than that of PNIPAAM homopolymers. The temperature-dependent solution conformation of PNIPAAM bottlebrush polymers in D2O is analyzed by small-angle neutron scattering (SANS), and data analysis using the Guinier-Porod model shows that the bottlebrush polymer radius decreases as the temperature increases towards the LCST for PNIPAAM bottlebrush polymers with relatively long 9 kg mol1 sidechains. Above the LCST, PNIPAAM bottlebrush polymers can form a lyotropic liquid crystal phase in water. Interfacial tension measurements show that bottlebrush polymers reduce the interfacial tension between chloroform and water to levels comparable to PNIPAAM homopolymers without the formation of microemulsions, suggesting that bottlebrush polymers are unable to stabilize highly curved interfaces. These results demonstrate that bottlebrush polymer side-chain length and flexibility impact phase behavior, solubility, and interfacial properties.en_US
dc.identifier.citationLi, Xianyu, ShamsiJazeyi, Hadi, Pesek, Stacy L., et al.. "Thermoresponsive PNIPAAM bottlebrush polymers with tailored side-chain length and end-group structure." <i>Soft Matter,</i> 10, (2014) The Royal Society of Chemistry: 2008-2015. http://dx.doi.org/10.1039/c3sm52614c.en_US
dc.identifier.doihttp://dx.doi.org/10.1039/c3sm52614cen_US
dc.identifier.urihttps://hdl.handle.net/1911/76258en_US
dc.language.isoengen_US
dc.publisherThe Royal Society of Chemistryen_US
dc.rightsThis Open Access Article is licensed under a Creative Commons Attribution-Non Commercial 3.0 Unported Licenceen_US
dc.rights.urihttps://creativecommons.org/licenses/by-nc/3.0/en_US
dc.titleThermoresponsive PNIPAAM bottlebrush polymers with tailored side-chain length and end-group structureen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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