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Estimation of copolymer/water interfacial tensions using pendant drop tensiometry

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Abstract
Copolymer/water interfacial tensions of statistical copolymers of styrene/n-butyl acrylate were estimated by pendant drop tensiometry using an “inverse” configuration according to which a drop of water was formed in toluene/copolymer solutions. The study first involved the precise measurement of copolymer solutions density using pycnometry. Subsequently, interfacial tensions of copolymer solutions against water were plotted as a function of copolymer concentration in toluene. Several methods were explored to fit the experimental data and obtain estimates of copolymer/water interfacial tensions at 100% copolymer concentration in toluene by extrapolation. The Belton−Evans extrapolation resulted in the best fit with the experimental data. When plotted as a function of the styrene composition of the copolymer, the interfacial tensions estimates followed an additivity relationship. This enabled estimation of the copolymer/water interfacial tensions directly from their respective homopolymer/water interfacial tensions values. These results are particularly useful for the prediction of composite particle morphology involving copolymerization of multiple monomers.
Item Type: | Article |
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Authors/Creators: | Jasinski, F and Alkhater, a and Thickett, SC and Brinkhuis, RH and Zetterlund, PB |
Keywords: | interfacial tension, pendant drop tensiometry, copolymers |
Journal or Publication Title: | Langmuir |
Publisher: | Amer Chemical Soc |
ISSN: | 0743-7463 |
DOI / ID Number: | 10.1021/acs.langmuir.8b00554 |
Copyright Information: | Copyright © 2018 American Chemical Society |
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