TY - GEN
T1 - Effects of carboxymethyl cellulose and ethyl(hydroxyethyl) cellulose on surface tructure of coatings drawn down from polystyrene suspensions
AU - Wallström, Alexandra
AU - Järnström, Lars
AU - Hansen, Peter
AU - Peltonen, Jouko
PY - 2003
Y1 - 2003
N2 - The surface structure of coating layers drawn down from polystyrene suspensions was investigated. The effects of two different soluble cellulose ethers, ethyl(hydroxyethyl) cellulose and carboxymethyl cellulose, were compared. Each of the suspensions was investigated at three different concentration levels of the soluble cellulose ethers. An Atomic Force Microscope was used to investigate the surface structure of coating layers drawn down on polyester substrates from aqueous polystyrene (PS) suspensions. The surface structure was interpreted by calculating the pair distribution function g(r), where r is the radius of a ring centered at a particle. The colloidal stability of the polystyrene suspensions was also investigated by means of rheology. The relative viscosity was calculated in order to elucidate the colloidal stability and degree of flocculation. Ethyl(hydroxyethyl) cellulose possesses temperature responsive properties, and the suspensions were investigated at two temperatures, 23°C and 55°C. The effects of the concentration of cellulose ether on the relative viscosity indicated that ethyl(hydroxyethyl) cellulose, at least at the higher temperature, destabilized the PS suspensions by a capillary induced phase separation mechanism.
AB - The surface structure of coating layers drawn down from polystyrene suspensions was investigated. The effects of two different soluble cellulose ethers, ethyl(hydroxyethyl) cellulose and carboxymethyl cellulose, were compared. Each of the suspensions was investigated at three different concentration levels of the soluble cellulose ethers. An Atomic Force Microscope was used to investigate the surface structure of coating layers drawn down on polyester substrates from aqueous polystyrene (PS) suspensions. The surface structure was interpreted by calculating the pair distribution function g(r), where r is the radius of a ring centered at a particle. The colloidal stability of the polystyrene suspensions was also investigated by means of rheology. The relative viscosity was calculated in order to elucidate the colloidal stability and degree of flocculation. Ethyl(hydroxyethyl) cellulose possesses temperature responsive properties, and the suspensions were investigated at two temperatures, 23°C and 55°C. The effects of the concentration of cellulose ether on the relative viscosity indicated that ethyl(hydroxyethyl) cellulose, at least at the higher temperature, destabilized the PS suspensions by a capillary induced phase separation mechanism.
KW - Paper coating structure
KW - carboxymethyl cellulose
KW - polystyrene
UR - http://www.scopus.com/inward/record.url?scp=18244430803&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:18244430803
SN - 1930657048
T3 - TAPPI Advanced Coating Fundamentals Symposium
SP - 209
EP - 222
BT - TAPPI Advanced Coating Fundamentals Symposium
T2 - Proceedings of the 2003 TAPPI 8th Advanced Coating Fundamentals Symposium
Y2 - 8 May 2003 through 10 May 2003
ER -