Monolayers of hydrogen-bonded polymer blends at the air–water interface: poly(vinylacetate)+poly (4-hydroxystyrene) |
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Authors: | F Monroy M J Esquinas F Ortega R G Rubio |
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Institution: | (1) Dept. Química Físca l Facultad de Química Universidad Complutense 28040 Madrid Spain E-mail: rgrubio@eucmax.sim.ucm.es, ES |
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Abstract: | The surface pressure (Π) vs surface concentration (Γs) curves of the hydrogen-bonded polymer blend poly(vinylacetate)+ poly(4-hydro-xystyrene) (PVAc+P4HS) have been measured at
25 °C onto a water subphase at pH=2.0. While PVAc forms extended monolayers, and the free surface of water is found to be
a good solvent for it, P4HS forms compressed monolayers, and the surface is a near Θ-type solvent for it. PVAc and P4HS form
miscible non-ideal monolayers until near the collapse pressure through the whole concentration range. The composition dependence
of the Π–Γs curves is rather complex. Contrary to what might be expected, the addition of PVAc to the blend does not reduce the rigidity
of the monolayer until its weight fraction is larger than 0.5. The compressibility data of the P4HS-rich monolayers suggest
the existence of a second maximum at high surface coverages, a result already observed in some polysiloxanes.
Received: 11 March 1998 Accepted: 7 May 1998 |
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Keywords: | Monolayers polymer blends hydrogen bonds poly (4-hydroxystyrene) poly(vinylacetate) |
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