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

Simple item page
dc.citation.firstpage2008
dc.citation.journalTitleSoft Matter
dc.citation.lastpage2015
dc.citation.volumeNumber10
dc.contributor.authorLi, Xianyu
dc.contributor.authorShamsiJazeyi, Hadi
dc.contributor.authorPesek, Stacy L.
dc.contributor.authorAgrawal, Aditya
dc.contributor.authorHammouda, Boualem
dc.contributor.authorVerduzco, Rafael
dc.date.accessioned2014-07-23T15:30:35Z
dc.date.available2014-07-23T15:30:35Z
dc.date.issued2014
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.
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.
dc.identifier.doihttp://dx.doi.org/10.1039/c3sm52614c
dc.identifier.urihttps://hdl.handle.net/1911/76258
dc.language.isoeng
dc.publisherThe Royal Society of Chemistry
dc.rightsThis Open Access Article is licensed under a Creative Commons Attribution-Non Commercial 3.0 Unported Licence
dc.rights.urihttps://creativecommons.org/licenses/by-nc/3.0/
dc.titleThermoresponsive PNIPAAM bottlebrush polymers with tailored side-chain length and end-group structure
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
c3sm52614c.pdf
Size:
1.36 MB
Format:
Adobe Portable Document Format
Description:
Download
Collections
Faculty Publications
Chemical and Biomolecular Engineering Publications