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Abstract
The effect of three groups of nonionic water soluble cellulose polymers, hydroxyethylcellulose, hydroxypropylcellulose and hydroxypropylmethylcellulose, on the stability or polystyrene latex suspensions and suspensions of the ibuprofen has been investigated.
Results of sedimentation volume, redispersibility and suspension appearance indicated that at low cellulose polymer concentrations suspensions were flocculated whereas at high concentrations suspensions were deflocculated. For hydroxyethyl-cellulose-ibuprofen suspensions flocculation was also observed at high concentrations. Flocculated suspensions obtained were not correlated with the energy diagrams. This was attributed to the flocculation energy involved in the interaction.