Interaction parameters of poly(vinyl methyl ether) in aqueous solution as determined by small-angle neutron scattering

doi:10.1016/0032-3861(94)90762-5

Polymer

Volume 35, Issue 11, May 1994, Pages 2284-2289

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Abstract

We have measured the small-angle neutron scattering from semidilute solutions of poly(vinyl methyl ether) in water and in methanol-water mixtures in a poor solvent regime. The binary and ternary cluster integrals of the polymer segments were determined from the concentration dependence of the correlation length at various temperatures just below the lower critical solution temperature. We have calculated the contributions of the segment-segment interactions to the entropy and enthalpy from the measured temperature dependences of these interaction parameters and found that both quantities are positive and decrease with increasing methanol content. The implication of these findings is discussed.

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Small angle neutron scattering (SANS) technique was employed to study the interaction parameter changes in PVME in methanol-water mixture. Enthalpic and entropic contribution defines the dependency of interaction parameters on the content of methanol in solution mixture [129]. Scientific communities are paying more attention to use PVME in several areas of research and modifying their efficiency to tune the LCST in presence of different kind of additives.
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PVME is widely studied with different additives and also as copolymers. In similar context, many research groups [9,14,22–24] investigated the effect of inorganic salts on the phase transition temperature of PVME using FTIR with attenuated total reflection (ATR) accessory, resulted in reduced LCST due to the tendency of the ions to attract water. Alteration in the water structure around PVME is an important parameter for examining the temperature induced changes in the interactions among PVME and water molecules [4,25].
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Polymer paperInteraction parameters of poly(vinyl methyl ether) in aqueous solution as determined by small-angle neutron scattering

Abstract

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Polymer paper
Interaction parameters of poly(vinyl methyl ether) in aqueous solution as determined by small-angle neutron scattering