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Optorheological thickening under the pulsed laser photocrosslinking of a polymer
Author(s) -
Okoniewski Stephen Richard,
Wisniewski Danielle,
Frazer N. Laszlo,
Mu Weiqiang,
Arceo Andrew,
Rathi Pranjali,
Ketterson J. B.
Publication year - 2014
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.40690
Subject(s) - materials science , viscosity , polystyrene , polymer , rheology , aqueous solution , colloid , ethylene glycol , polymer chemistry , fluence , irradiation , chemical engineering , laser , composite material , chemistry , optics , organic chemistry , physics , nuclear physics , engineering
Electro‐, magneto‐, and other rheological effects can be used to externally control fluid viscosity. However, they are largely reversible and in addition subject to colloidal settling, electrostatic breakdown, or high cost. In the experiments described here the dependence of the viscosity of a polymer solution under pulsed laser photocrosslinking as a function of radiation dose is determined using the Brownian motion of colloidal polystyrene tracers that were optically confined to a one dimensional channel. The system studied was a transparent aqueous solution of poly(ethylene glycol) dimethacrylate together with a 1‐hydroxycyclohexyl phenyl ketone photoinitiator. An increase in the viscosity of the solution with the laser fluence was observed. The growth was exponential, stable between pulses, and spanned nearly three orders of magnitude. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40690.