Journal
ANALYTICA CHIMICA ACTA
Volume 654, Issue 1, Pages 35-39Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2009.05.001
Keywords
Nuclear magnetic resonance (NMR); Time-domain-nuclear magnetic resonance (TD-NMR); Polymer dispersions; Swelling; Distribution coefficient; Relaxation times
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In this contribution, we discuss the potential of low-field time-domain(TD)-NMR to study the swelling of (aqueous) polymer dispersions by a volatile solvent. Due to the sensitivity of transverse relaxation times (T(2)) to swelling-induced changes in the molecular dynamics of the polymer component, the effects of swelling can be measured without spectral resolution. The measurement is performed on polymer dispersions in native state with solids contents around 50% in a non-invasive way without separating the polymeric phase and the water phase from each other. Using acetone in two polyurethane (PU) dispersions with different hard phase contents, we explore the sensitivity of the method and present a data evaluation strategy based on multicomponent fitting and proton balancing. Furthermore, we report exchange continualization as a further effect that needs to be taken into account for correct interpretation of the data. (C) 2009 Elsevier B.V. All rights reserved.
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