On the glass transition and physical aging in nanoconfined polymers

Christopher J. Ellison, Rodney D. Priestley, Linda J. Broadbelt, Manish K. Mundra, Perla Rittigstein, John M. Torkelson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The glass transition temperature (Tg) and physical aging behavior of nanoconfined polymer films were investigated by novel fluorescence methods. These studies have revealed that there are large modifications in both Tg and physical aging behavior due to interfacial effects. For example, Tg was observed to decrease compared to bulk in polymers where free-surface effects dominate (e.g., for polystyrene (PS) on silica substrates), while Tg was observed to increase compared to bulk for polymers where strong attractive substrate interactions dominate (e.g., for poly(2-vinylpyridine) (P2VP) on silica substrates). Similar interfacial effects were observed for physical aging, where attractive substrate effects retarded physical aging compared to bulk. Furthermore, the Tg-nanoconfinement effect was observed to be widely tunable by small variations on the repeat unit structure of PS or by the addition of low molecular weight diluents or plasticizers. Finally, Tg and enthalpy relaxation behavior were investigated by differential scanning calorimetry for PS-silica and P2VP-silica nanocomposites. As in the nanoconfined film studies, interfacial interactions were key in dictating the ultimate properties of the nanocomposite, but it was also observed that preparation method plays a significant role.

Original languageEnglish (US)
Title of host publicationSociety of Plastics Engineers Annual Technical Conference 2005, ANTEC 2005 - Conference Proceedings
Pages274-278
Number of pages5
Volume6
StatePublished - Dec 1 2005
EventSociety of Plastics Engineers Annual Technical Conference 2005, ANTEC 2005 - Boston, MA, United States
Duration: May 1 2005May 5 2005

Other

OtherSociety of Plastics Engineers Annual Technical Conference 2005, ANTEC 2005
CountryUnited States
CityBoston, MA
Period5/1/055/5/05

Keywords

  • Glass transition temperature
  • Nanocomposites
  • Nanoconfinement effects
  • Physical aging

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