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Drying rate variations of latex dispersions due to salt induced skin formation

Erkselius, Stefan LU ; Wadsö, Lars LU and Karlsson, Ola LU (2008) In Journal of Colloid and Interface Science 317(1). p.83-95
Abstract
Film formation from latex dispersions with varying concentrations of sodium dodecylsulfate (SDS) and sodium persulfate (NaPS) was studied with a sorption balance. The drying rate decreased significantly at a critical volume fraction of polymer (pc). Under constant drying conditions the pc varied due to differences in particle stabilization. In SDS containing samples, the droplets wetted larger areas, the film thicknesses decreased and, consequently, the initial evaporation rate was decreased. The decrease in the initial evaporation rate first continued with increasing SDS concentration but leveled off at an apparent critical micelle concentration (CMC). Samples containing NaPS had different types of film formation mechanisms with large... (More)
Film formation from latex dispersions with varying concentrations of sodium dodecylsulfate (SDS) and sodium persulfate (NaPS) was studied with a sorption balance. The drying rate decreased significantly at a critical volume fraction of polymer (pc). Under constant drying conditions the pc varied due to differences in particle stabilization. In SDS containing samples, the droplets wetted larger areas, the film thicknesses decreased and, consequently, the initial evaporation rate was decreased. The decrease in the initial evaporation rate first continued with increasing SDS concentration but leveled off at an apparent critical micelle concentration (CMC). Samples containing NaPS had different types of film formation mechanisms with large variations in pc and the total drying time, which could be explained by differences in the electrostatic stabilization. For dialyzed dispersions containing no NaPS, pc was close to 0.7. In samples with medium high NaPS concentration a skin was formed at the air interface causing an early shift in the evaporation rate, resulting in 0.25<pc<0.7. At high NaPS concentration the particles coagulated and settled giving an apparent increase in pc, i.e., values above 0.7. Deviations from the skin formation behavior predicted by the Routh and Russel (RR) model were observed. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Colloid and Interface Science
volume
317
issue
1
pages
83 - 95
publisher
Elsevier
external identifiers
  • wos:000251283100011
  • scopus:36048957591
ISSN
1095-7103
DOI
10.1016/j.jcis.2007.09.041
language
English
LU publication?
yes
id
aa35e2a3-d1d8-4033-9e81-ce1528e51575 (old id 632470)
date added to LUP
2007-11-29 17:21:00
date last changed
2017-05-14 03:37:55
@article{aa35e2a3-d1d8-4033-9e81-ce1528e51575,
  abstract     = {Film formation from latex dispersions with varying concentrations of sodium dodecylsulfate (SDS) and sodium persulfate (NaPS) was studied with a sorption balance. The drying rate decreased significantly at a critical volume fraction of polymer (pc). Under constant drying conditions the pc varied due to differences in particle stabilization. In SDS containing samples, the droplets wetted larger areas, the film thicknesses decreased and, consequently, the initial evaporation rate was decreased. The decrease in the initial evaporation rate first continued with increasing SDS concentration but leveled off at an apparent critical micelle concentration (CMC). Samples containing NaPS had different types of film formation mechanisms with large variations in pc and the total drying time, which could be explained by differences in the electrostatic stabilization. For dialyzed dispersions containing no NaPS, pc was close to 0.7. In samples with medium high NaPS concentration a skin was formed at the air interface causing an early shift in the evaporation rate, resulting in 0.25&lt;pc&lt;0.7. At high NaPS concentration the particles coagulated and settled giving an apparent increase in pc, i.e., values above 0.7. Deviations from the skin formation behavior predicted by the Routh and Russel (RR) model were observed.},
  author       = {Erkselius, Stefan and Wadsö, Lars and Karlsson, Ola},
  issn         = {1095-7103},
  language     = {eng},
  number       = {1},
  pages        = {83--95},
  publisher    = {Elsevier},
  series       = {Journal of Colloid and Interface Science},
  title        = {Drying rate variations of latex dispersions due to salt induced skin formation},
  url          = {http://dx.doi.org/10.1016/j.jcis.2007.09.041},
  volume       = {317},
  year         = {2008},
}