Colored polymer microparticles through carbon dioxide-assisted dyeing
A new procedure is described for dyeing polymer beads using liquid carbon dioxide as a plasticizer to facilitate transport of dye into the particle phase. Aqueous latexes consisting of monodisperse polystyrene particles with surface-grafted poly(N-vinylpyrrolidone) were dyed with Sudan Red 7B using CO{sub 2} at 25 C and 310 bar. Adding CO{sub 2} to the headspace above the latex resulted in some dyeing of the polymer, but better results were obtained by forming an emulsion of CO{sub 2} in the aqueous latex phase. Emulsions were formed with both a fluorinated and a hydrocarbon-based surfactant. It was found that the carbon dioxide emulsion greatly enhances the transfer of dye into the polystyrene without altering the size or morphology of the particles.
- Research Organization:
- Los Alamos National Lab., NM (US)
- OSTI ID:
- 20080282
- Journal Information:
- Langmuir, Vol. 16, Issue 11; Other Information: PBD: 30 May 2000; ISSN 0743-7463
- Country of Publication:
- United States
- Language:
- English
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