Impacts of polymer/surfactant interactions on spray drift

Wang, Ruobing, Dorr, Gary, Hewitt, Andrew and Cooper-White, Justin (2016) Impacts of polymer/surfactant interactions on spray drift. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 500 88-97. doi:10.1016/j.colsurfa.2016.03.056

Author Wang, Ruobing
Dorr, Gary
Hewitt, Andrew
Cooper-White, Justin
Title Impacts of polymer/surfactant interactions on spray drift
Journal name Colloids and Surfaces A: Physicochemical and Engineering Aspects   Check publisher's open access policy
ISSN 1873-4359
Publication date 2016-07-05
Year available 2016
Sub-type Article (original research)
DOI 10.1016/j.colsurfa.2016.03.056
Open Access Status Not Open Access
Volume 500
Start page 88
End page 97
Total pages 10
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2017
Language eng
Abstract Polymers and surfactants are commonly used as adjuvants in agrochemical spray solutions. In this study, we probe the effects of changes in steady state polymer chain conformation (as a result of surfactant addition) on the physical properties of dilute polymer solutions and the resulting spray performance when such solutions are processed through a commercial spray nozzle. To create a panel of model adjuvant formulations for spraying, we added either an associative (sodium dodecyl sulfate (SDS)) or non-associative (Tween20 (polysorbate20)) surfactant, over a range of concentrations, to a base dilute Poly(ethylene oxide) (PEO) solution. The addition of the associative SDS to the PEO solution decreased the dynamic surface tension, slightly increased the zero shear viscosity and substantially increased the extensional properties of the solutions, with a strong dependency on SDS concentration. Under the high deformation processes experienced in a spray nozzle, the addition of SDS shifted the droplet size distribution to larger droplet sizes, and substantially reduced the spray drift. No such changes were seen for the non-associative PEO/Tween20 system. The changes in the dynamics of extension of the PEO chains induced through the association of a surfactant were found to be the dominant effector dictating spray performance.
Keyword Polymer/surfactant interactions
Polymer chain dynamics
Spray drift
Droplet size distribution
Dynamic surface tension
Extensional viscosity
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

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