Capillary wave investigation of surface films of diblock copolymers on an organic subphase. Poly(dimethylsiloxane)-Poly(styrene) films at the air/ethyl benzoate interface
- Univ. of Wisconsin, Madison, WI (United States)
- Sandia National Lab., Albuquerque, NM (United States)
The surface film viscoelastic properties of poly(dimethylsiloxane) (PDMS) homopolymers and several poly(dimethylsiloxane)-poly(styrene) (PDMS-PS) diblock copolymers at the air/ethyl benzoate (A/EB) interface have been examined by surface quasi-elastic light scattering (SLS) as a function of surface pressure, II, determined with the Wilhelmy plate technique. All systems used in this study form stable, but to some extent, soluble monolayers at A/EB. The advantage of SLS is that it gives reliable dynamic film elasticities and viscosities even in a situation where the static elasticities cannot be determined by standard methods. Relative to the values for PDMS homopolymers at the same II, increases in both the surface dilational elasticity, [epsilon][sub d], and the corresponding viscosity, [kappa], for the diblock copolymers are observed for all copolymer samples. The deviations occur at much lower surface pressures for the asymmetric copolymers (higher PS content) than for a nearly symmetric sample. This suggests that the symmetric sample interacts mainly via the surface PDMS blocks, while the highly asymmetric samples interact mainly through the submerged PS blocks. The magnitudes of [epsilon][sub d] and [kappa] for the copolymers obtained in this study are consistent with the picture of relatively flexible, submerged PS blocks. 32 refs., 10 figs., 2 tabs.
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 7102078
- Journal Information:
- Langmuir; (United States), Journal Name: Langmuir; (United States) Vol. 10:6; ISSN LANGD5; ISSN 0743-7463
- Country of Publication:
- United States
- Language:
- English
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
AIR
COMPILED DATA
COPOLYMERS
DATA
ELASTICITY
ESTERS
FILMS
FLUIDS
GASES
INFORMATION
LIGHT SCATTERING
MECHANICAL PROPERTIES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
ORGANIC SILICON COMPOUNDS
POLYMERS
PRESSURE MEASUREMENT
SCATTERING
SILICONES
SILOXANES
TENSILE PROPERTIES
VISCOSITY