A fluorescence approach to investigate repartitioning of coalescing agents in acrylic polymer emulsions |
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Authors: | Tanzeela N Raja Albert M Brouwer Tijs Nabuurs Ronald Tennebroek |
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Institution: | (1) University of Amsterdam, P.O. Box 94157, 1090 GD Amsterdam, The Netherlands;(2) DSM Coating Resins, Sluisweg 12, 5145 PE Waalwijk, The Netherlands; |
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Abstract: | Repartitioning of co-solvents between particles of latex emulsions was investigated by means of a fluorescence method based
on the detection of the amount of co-solvent via the solvatochromic shift of the emission maximum of a fluorescent probe,
copolymerized at a low concentration. Complete repartitioning of co-solvents between particles of latex materials with a low
T
g
(ca. 25 °C) occurred within minutes. For a hydrophilic latex with a T
g
of 68 °C, equilibration was achieved within an hour. Repartitioning was faster for more hydrophobic co-solvents. For a hydrophobic
latex of similar T
g
, co-solvent repartitioning took place on the same time scale, but complete equilibration was not reached. Possibly, there
is an additional slow component in the repartitioning, or the prolonged presence of co-solvent causes a structural change
in the latex particles that affects the outcome of the experiment. |
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Keywords: | |
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