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 548024
Title Hydroplasticization of latex films with varying methacrylic acid content
Author(s) Voogt, Benjamin; Huinink, Henk; Kamp-Scheerder, Loes van der; Erich, Bart; Scheerder, Jurgen; Venema, P.; Adana, Olaf
Source Polymer 166 (2019). - ISSN 0032-3861 - p. 206 - 214.
DOI https://doi.org/10.1016/j.polymer.2019.01.074
Department(s) VLAG
Physics and Physical Chemistry of Foods
Publication type Refereed Article in a scientific journal
Publication year 2019
Keyword(s) Hydroplasticization - Coating - Polymer mobility
Abstract The hydroplasticization of coatings of acrylic copolymers with different amounts of methacrylic acid (MAA) was investigated to clarify the role of carboxylic acid functionalities on the change in polymer mobility due to water uptake. The coating Tg as a function of water uptake was studied using dynamic mechanical analysis. The Tg’s decreased with increasing water content, confirming the plasticizing effect of water on the coatings. At relative humidities between 0 and 60% the coating Tg shows a sharper decrease than at higher , an effect that increases with increasing MAA content. This behavior is attributed to the presence of dimers of carboxylic acid in the coatings, which is also observed with FTIR-ATR analyses. Due to water uptake, the dimers are disrupted and form “open” dimers where carboxylic acid groups remain in close proximity and are connected through water molecules. With 1H NMR relaxometry, two T2 relaxation times are found, representing two hydrogen pools with different mobilities. Both mobilities increase with increasing water content, indicating the presence of polymer domains with different hardness. Correlating the T2 relaxation times with the coating Tg’s shows that at higher MAA content the proton mobility as a function of Tg of the soft domains increases with increasing MAA content. Since the polymer proton mobility, and hence the polymer mobility, is expected to scale with the polymer Tg, it is hypothesized that harder domains are present in the coatings, which are not visible in the Ostroff-Waugh decays due to the fast relaxation behavior of these protons.
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