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Published December 10, 2009 | public
Journal Article

Effects of pairwise, donor-acceptor functional groups on polymer solubility, solution viscosity and mist control


Homologous series of functionalized polymers were used to compare the solution properties of donor–acceptor (DA) interpolymer mixtures with those of self-associating and non-associating polymer analogues. Polymer analogous synthesis was used to produce a series of polymers from a specific, anionically-polymerized prepolymer (1250 kg/mol polybutadiene), using thiol-ene coupling to incorporate systematically-varied contents of side groups: either tertiary amines (as proton acceptors) or carboxylic acids (both as proton donors in donor–acceptor mixtures, or as self-associating moieties in single-polymer solutions). Comparison with controls reveals that, relative to the effects of self-associations, DA interpolymer interactions more strongly affect solution properties such as phase behavior, interpolymer aggregation, shear viscosity, and elastic response in extensional flow. Specifically, DA associations lead to (i) greater reductions in polymer solubility in hydrocarbon solvents, (ii) interpolymer aggregation into larger clusters, and (iii) greater shear viscosity in solution. Nevertheless, DA associations reduced solution elasticity and mist suppression—a highly unanticipated result in light of the prior literature.

Additional Information

© 2009 Published by Elsevier Ltd. Received 19 June 2009; revised 29 September 2009; accepted 3 October 2009. Available online 16 October 2009. Funding for this research was provided by the FAA and NASA, the Caltech Milliken Foundation, and the Caltech Gates Grubstake Fund. We acknowledge the contributions of Brett F. Bathel and Prof. Albert Ratner (University of Iowa) in the drop breakup experiments and of Dr. Jan P. Plog (Thermo Fisher Scientific) in the CaBER experiments. We also thank Dr. Steven Smith of Proctor and Gamble Company for supplying the 1,2-PB precursor materials, and Dr. Suneel Kunamaneni for contributing the ideas that initiated the direction of this work.

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