Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 539200
Title Water mobility during drying of hard and soft type latex : Systematic GARField 1H NMR relaxometry studies
Author(s) Voogt, Benjamin; Huinink, Henk; Erich, Bart; Scheerder, Jurgen; Venema, Paul; Adan, Olaf
Source Progress in Organic Coatings 123 (2018). - ISSN 0300-9440 - p. 111 - 119.
DOI https://doi.org/10.1016/j.porgcoat.2018.06.011
Department(s) Physics and Physical Chemistry of Foods
VLAG
Publication type Refereed Article in a scientific journal
Publication year 2018
Keyword(s) GARField H NMR - Latex drying - Relaxometry - T - Water mobility
Abstract

GARField 1H NMR relaxometry experiments were done to study the drying process of two latices with different polymer Tg and to elucidate water mobility behavior during this process. It was found that the hard type latex, with a polymer Tg above room temperature, dries faster than the soft type latex, with a polymer Tg below room temperature. Diffusion measurements by means of echo time variations at different moments in the drying process show that water auto-diffusion decreases with increasing solid content of the latex independent of particle Tg. Two pools of protons with different mobilities were observed based on transversal relaxation T2. Determination of the long T2,long's and short T2,short's of both latex dispersions and their respective proton densities during drying at 80% RH showed evidence of particle deformation for the soft type latex and the absence thereof for the hard type latex. Additional drying of the resulting coatings with anhydrous CaCl2 showed a higher porosity for the hard type coating based on the proton distribution profile width. Moreover, two domains with different polymer proton mobilities are found for both coatings that are both plasticized by water at 80% RH. This is more apparent for the hard type coating, suggesting that a more hydrophilic polymer gives a higher degree of plasticization.

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