Confinement Effect on the Effective Viscosity of Plasticized Polymer Films

F. Chen, D. Peng, Y. Ogata, K. Tanaka, Z. Yang, Y. Fujii, N. L. Yamada, Chi Hang Lam, O. K.C. Tsui

Research output: Journal article publicationJournal articleAcademic researchpeer-review

19 Citations (Scopus)


We have measured the effective viscosity of polystyrene films with a small (4 wt %) added amount of dioctyl phthalate (DOP) deposited on silica. A broad range of molecular weights, Mw, from 13.7 to 2100 kg/mol was investigated. Our result shows that for the thin films with Mw< ∼100 kg/mol the addition of DOP causes the effective viscosity to decrease by a factor of ∼4, independent of Mw. But for the higher Mwfilms, the effective viscosity of the DOP added films creeps toward that of the neat films with increasing Mw. A model assuming the effective viscosity to be dominated by enhanced surface mobility for the lower Mwfilms but surface-promoted interfacial slippage for the higher Mwfilms is able to account for the experimental observations.
Original languageEnglish
Pages (from-to)7719-7726
Number of pages8
Issue number20
Publication statusPublished - 27 Oct 2015

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry


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