Temperature Dependence of Polymer Film Properties on the Air-Water Interface: Poly(vinyl acetate) and Poly(n-butyl methacrylate)

Kyung-hwa Yoo, Hyuk Yu

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Surface dynamic light scattering is used to deduce the surface viscoelastic properties of poly(vinyl acetate) (PVAc) and poly(n-butyl methacrylate) (PnBMA) spread at the air-water interface. The two polymers were selected as group representatives of expanded (PVAc) and condensed (PnBMA) type films. Surface longitudinal viscosity,k, and elasticity, e, for the two types were calculated from the frequency shift and line broadening of the power spectrum of the scattered light with a dispersion relation over a range of temperatures and surface concentrations. In some cases, the wavevector dependence of the spectral characteristics necessitated the incorporation of a transverse viscosity term, μ, in the dispersion equation, subject to the assumption that є andk didnot depend on the scattering wavevector. This transverse viscosity was shown to have an anomalous temperature dependence with characteristics different for the two polymers; an explanation of the temperature dependence in terms of a slow, collective transverse relaxation process is provided, which may be related to the orientational properties of the different polymers at the interface.

Original languageEnglish
Pages (from-to)4019-4026
Number of pages8
JournalMacromolecules
Volume22
Issue number10
DOIs
Publication statusPublished - 1989 Oct 1

Fingerprint

Polymer films
Polymers
Viscosity
Water
Air
Relaxation processes
Dynamic light scattering
Power spectrum
Temperature
Surface properties
Elasticity
Scattering
poly(butyl methacrylate)
vinyl acetate

All Science Journal Classification (ASJC) codes

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

Cite this

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Temperature Dependence of Polymer Film Properties on the Air-Water Interface : Poly(vinyl acetate) and Poly(n-butyl methacrylate). / Yoo, Kyung-hwa; Yu, Hyuk.

In: Macromolecules, Vol. 22, No. 10, 01.10.1989, p. 4019-4026.

Research output: Contribution to journalArticle

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AB - Surface dynamic light scattering is used to deduce the surface viscoelastic properties of poly(vinyl acetate) (PVAc) and poly(n-butyl methacrylate) (PnBMA) spread at the air-water interface. The two polymers were selected as group representatives of expanded (PVAc) and condensed (PnBMA) type films. Surface longitudinal viscosity,k, and elasticity, e, for the two types were calculated from the frequency shift and line broadening of the power spectrum of the scattered light with a dispersion relation over a range of temperatures and surface concentrations. In some cases, the wavevector dependence of the spectral characteristics necessitated the incorporation of a transverse viscosity term, μ, in the dispersion equation, subject to the assumption that є andk didnot depend on the scattering wavevector. This transverse viscosity was shown to have an anomalous temperature dependence with characteristics different for the two polymers; an explanation of the temperature dependence in terms of a slow, collective transverse relaxation process is provided, which may be related to the orientational properties of the different polymers at the interface.

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