Stimuli-responsive poly- N -isopropylacrylamide: Phenylene vinylene oligomer conjugate

dc.contributor.author Park, Young
dc.contributor.author Zhang, Bingqi
dc.contributor.author Kuo, Cheng-Yu
dc.contributor.author Martinez, Jennifer
dc.contributor.author Park, Jongwook
dc.contributor.author Mallapragada, Surya
dc.contributor.author Wang, Hsing-Lin
dc.contributor.department Chemical and Biological Engineering
dc.date 2018-02-15T14:55:47.000
dc.date.accessioned 2020-06-30T01:08:01Z
dc.date.available 2020-06-30T01:08:01Z
dc.date.copyright Tue Jan 01 00:00:00 UTC 2013
dc.date.embargo 2014-12-08
dc.date.issued 2013-01-01
dc.description.abstract <p>Phenylene vinylene trimer (OPV) and PNIPAM conjugate with stimuli-responsive optical properties has been synthesized through the formation of amide linkage between PNIPAM and carboxylic-acid-terminated OPV. This material exhibits thermoresponsive optical properties as temperature exceeds the lower critical solution temperature (LCST), which is 32 °C for PNIPAM and the conjugate. This PNIPAM-trimer conjugate is fully characterized by using NMR, FT-IR, temperature-dependent UV-vis, and fluorescence spectroscopy. We have found that the polymer conjugate solution turns opaque as temperature exceeds lower critical solution temperature and a five-fold increase in fluorescence intensity as temperature increases from 20 to 70 °C. Such distinct increase in fluorescence intensity is likely due to the rigidchromism, that is, the change in optical properties due to confinement of the chromophores resulting from restriction of polymer conformational structures. The PNIPAM-trimer conjugate also shows a decrease in decay lifetime with increasing temperature, whereas OPV trimer alone shows no change in decay lifetime as a function of temperature. These unique optical properties are not observed in the trimer and PNIPAM mixture, suggesting that the stimuli-responsive optical properties can occur only in PNIPAM-trimer conjugate linked through covalent bond.</p>
dc.description.comments <p>Reprinted (adapted) with permission from <em>Journal of Physical Chemistry C</em>, 117 (2013):, pp.7757-7763., doi: <a href="http://dx.doi.org/10.1021/jp312157q" target="_blank">10.1021/jp312157q</a>. Copyright 2013 American Chemical Society.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/cbe_pubs/151/
dc.identifier.articleid 1151
dc.identifier.contextkey 6435262
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath cbe_pubs/151
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/13241
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/cbe_pubs/151/0-2013_MallapragadaSK_StimuliResponsivePoly.html|||Fri Jan 14 20:35:42 UTC 2022
dc.source.bitstream archive/lib.dr.iastate.edu/cbe_pubs/151/2013_MallapragadaSK_StimuliResponsivePoly.pdf|||Fri Jan 14 20:35:44 UTC 2022
dc.source.uri 10.1021/jp312157q
dc.subject.disciplines Biochemical and Biomolecular Engineering
dc.subject.disciplines Materials Chemistry
dc.subject.keywords conformational structures
dc.subject.keywords fluorescence intensities
dc.subject.keywords increasing temperatures
dc.subject.keywords lower critical solution temperature
dc.subject.keywords stimuli-responsive
dc.subject.keywords acrylic monomers
dc.subject.keywords aromatic compounds
dc.subject.keywords chromophores
dc.subject.keywords oligomers
dc.title Stimuli-responsive poly- N -isopropylacrylamide: Phenylene vinylene oligomer conjugate
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication cf742fe7-cf8d-4bf5-98bd-00b8a45db967
relation.isOrgUnitOfPublication 86545861-382c-4c15-8c52-eb8e9afe6b75
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