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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
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
Related URLs:	Google Scholar: Thickett, SC UTAS Profile: Thickett, SC
Item Statistics:	View statistics for this item

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