Probing the thermal collapse of PNIPAM grafts by quantitative in situ ellipsometry

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Abstract

We demonstrate the potential of spectroscopic ellipsometry for the investigation of the chain segment density profile and layer thickness during the temperature-induced, reversible collapse−expansion transition of poly(N-isopropylacrylamide) (PNIPAM) grafted layers with variable grafting densities in aqueous systems. To obtain a quantitative description of the thickness of our swollen PNIPAM layers, various models were implemented to fit the ellipsometric data. From the ellipsometry results, the density and thickness variation accompanying the collapse transition across the lower critical solution temperature (LCST) was characterized. The collapse can be adequately explained by considering the PNIPAM film to consist of two layers: (i) a dense layer near the surface and (ii) a more diluted layer with a gradient density profile on the side of the film exposed to the solvent.
Original languageEnglish
Title of host publicationMRS Spring Meeting Proceedings
Place of PublicationSan Fracisco, California, USA
PublisherMaterials Research Society
Pages-
DOIs
Publication statusPublished - 2013
EventMRS Spring Meeting & Exhibit 2013 - San Francisco, United States
Duration: 1 Apr 20135 Apr 2013

Publication series

NameMRS Online Proceedings Library
PublisherMRS
Volume1544
ISSN (Print)0272-9172

Conference

ConferenceMRS Spring Meeting & Exhibit 2013
CountryUnited States
CitySan Francisco
Period1/04/135/04/13

Keywords

  • IR-89992
  • METIS-298054

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    Kooij, E. S., Sui, X., Hempenius, M. A., Zandvliet, H. J. W., & Vancso, G. J. (2013). Probing the thermal collapse of PNIPAM grafts by quantitative in situ ellipsometry. In MRS Spring Meeting Proceedings (pp. -). (MRS Online Proceedings Library; Vol. 1544). San Fracisco, California, USA: Materials Research Society. https://doi.org/10.1557/opl.2013.1081