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Investigations on the Film‐Formation Process of Latex Dispersions by Solid‐State NMR Spectroscopy
Author(s) -
Rottstegge Jörg,
Traub Bernd,
Wilhelm Manfred,
Landfester Katharina,
Heldmann Carsten,
Spiess Hans Wolfgang
Publication year - 2003
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200390045
Subject(s) - polymer , chemical engineering , polyelectrolyte , ionic bonding , solid state nuclear magnetic resonance , spectroscopy , polymer chemistry , nuclear magnetic resonance spectroscopy , materials science , chemistry , pulmonary surfactant , organic chemistry , nuclear magnetic resonance , ion , physics , quantum mechanics , engineering
Various latex dispersions based on poly(vinyl acetate) stabilised by different surfactants and polyelectrolytes were investigated by NMR methods to elucidate the macroscopic and molecular film‐formation process of these latex dispersions. Macroscopically, the inhomogeneous drying in the film‐formation process was investigated by NMR‐imaging techniques. Here the influence of different amounts of surfactant on the homogeneity of the drying process was monitored. The molecular film‐formation process was investigated by 1 H, 2 H, and 13 C solid‐state NMR spectroscopy. For these bulk measurements, films of latex dispersions were homogeneously dried to different defined solid contents. Spectroscopic analysis allows the investigation of the drying process of the water at different solid contents with a pronounced influence on the polymer/water interface and the latex particle core. The film‐formation process is correlated to the drying mechanism of different types of water within the film. External water, water at ionic and non‐ionic groups at surfactants in the polymer/water interface, and water in the swollen and mobilised polymer, could be distinguished during the drying process.Latex domains as selected by solid‐state NMR spectroscopy as a function of temperature.