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dc.contributor.author
Cui, Jiaxi
dc.contributor.author
Nguyen, Thi-Huong
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Ceolin, Marcelo Raul
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Berger, Rü diger
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Azzaroni, Omar
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Del Campo, A.
dc.date.available
2019-09-24T18:21:20Z
dc.date.issued
2012-03
dc.identifier.citation
Cui, Jiaxi; Nguyen, Thi-Huong; Ceolin, Marcelo Raul; Berger, Rü diger; Azzaroni, Omar; et al.; Phototunable response in caged polymer brushes; American Chemical Society; Macromolecules; 45; 3-2012; 3213-3220
dc.identifier.issn
0024-9297
dc.identifier.uri
http://hdl.handle.net/11336/84298
dc.description.abstract
A light-responsive brush was obtained by surface-initiated ATRP of a methacrylate monomer containing ionizable −COOH side groups caged with the photoremovable group 4,5-dimethoxy-2-nitrobenzyl (NVOC). In the caged form, the polymer brush (PNVOCMA) is neutral and hydrophobic due to the presence of the aromatic chromophore. Upon irradiation the NVOC group is removed and a polyanion (polymethacrylic acid, PMAA) chain is generated. The charged brush can swell and collapse depending on the pH and the exposure dose (i.e., uncaging degree). The behavior and properties of the brush layer for different photoconversion degrees were studied. On the basis of quartz crystal microbalance measurements, a threshold of 50% uncaging was identified in order to achieve significant swelling and pH response of the brush. Between 50 and 80% the photoconversion the response of the brush could be light-modulated. For photoconversions >80% only small changes in the response were detectable. X-ray reflectivity (XRR) and scanning force microscopy allowed us to measure thickness, roughness and swelling of the brushes at intermediate photoconversions. Combined XRR and grazing-incidence small-angle scattering experiments evidenced a change in the internal structure of the brush upon exposure and indicated the occurrence of domain segregation as a consequence of the coexistence of hydrophobic and charged groups in the brush structure.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
American Chemical Society
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Química Macromolecular
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Polymer Brushes
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Polymer Thin Films
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Materiales Fotoactivos
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Físico-Química, Ciencia de los Polímeros, Electroquímica
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Ciencias Químicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Phototunable response in caged polymer brushes
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-05-06T14:41:50Z
dc.journal.volume
45
dc.journal.pagination
3213-3220
dc.journal.pais
Estados Unidos
dc.journal.ciudad
Washington
dc.description.fil
Fil: Cui, Jiaxi. Max Planck Institut Fuer Polymer Forschung; Alemania
dc.description.fil
Fil: Nguyen, Thi-Huong. Max Planck Institut Fuer Polymer Forschung; Alemania
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Fil: Ceolin, Marcelo Raul. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina
dc.description.fil
Fil: Berger, Rü diger. Max Planck Institut Fuer Polymer Forschung; Alemania
dc.description.fil
Fil: Azzaroni, Omar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina
dc.description.fil
Fil: Del Campo, A.. Max Planck Institut Fuer Polymer Forschung; Alemania
dc.journal.title
Macromolecules
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://dx.doi.org/10.1021/ma300274b
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://pubs.acs.org/doi/10.1021/ma300274b
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