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Viscosity buildup in condensation reactions: Reaction conditions and reactor size effects
Author(s) -
Dairanieh I. S.
Publication year - 1991
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760310509
Subject(s) - viscosity , materials science , mixing (physics) , inherent viscosity , agitator , melamine , thermodynamics , condensation , formaldehyde , temperature dependence of liquid viscosity , reduced viscosity , viscosity index , relative viscosity , chemical engineering , intrinsic viscosity , composite material , chemistry , organic chemistry , polymer , scanning electron microscope , physics , base oil , quantum mechanics , engineering
The viscosity of sulfonated melamine‐formaldehyde resins prepared in batch receptors of different sizes is shown to be a function of the reaction time, temperature, and pH. A formula relating these variables to viscosity buildup is presented. It shows that the pH is more influential than the temperature in increasing viscosity. The reactor mixing patterns are also shown to have a profound influence on resin viscosity. The agitator geometry, and not its tip speed, was found to affect considerably the viscosity buildup. Implications of these observations on the scale‐up of condensation reactions are discussed.