Author/Authors :
Javidnia, Halimeh amirkabir university of technology - Department of Polymer Engineeringand Color Technology - Loghman Fundamental Research Group, تهران, ايران , Mohammadi, Naser amirkabir university of technology - Department of Polymer Engineeringand Color Technology - Loghman Fundamental Research Group, تهران, ايران , Mousavi Shooshtari, Ahmad amirkabir university of technology - Textile Engineering Department, تهران, ايران , Ghasemirad, Somayeh amirkabir university of technology - Department of Polymer Engineeringand Color Technology - Loghman Fundamental Research Group, تهران, ايران , Farajpoor, Tohid amirkabir university of technology - Chemistry Group, تهران, ايران , Ghanbari, Mohammad Reza amirkabir university of technology - Department of Polymer Engineeringand Color Technology - Loghman Fundamental Research Group, تهران, ايران
Abstract :
The effect of butyl glycol acetate (BGA)/ethyl acetate (EA) mixed solventscom-position on nitrocellulose (NC) solution miscibility and rheological propertieswith or without non-ionic surfactants was investigated. In addition the emulsificationof the solution containing two non-ionic surfactants with weight averagehydrophilic/lipophilic balance of 14.75 (oil phase), its colloidal stability and microfilterabilitywere studied. The results showed that oil phase viscosity and surfacetension increase by high boiling point solvent (BGA) between 50 and 87.5 wt%, whichreduced the colloid particle size from 35 ìm down to 10 ìm. While surfactant freesolution viscosity of NC in the BGA/EA mixed solvents increased to a maximum at75 wt% of BGA, the addition of the non-ionic surfactants changed the situation to aminimum at the same BGA content. The complex behaviour was assigned to thecompetitive interactions of solution components via hydrogen bond formation. Thecolloid particle size decreases depended also on (delta)gmix^c, the Gibbs free energydensity of mixing two phases, due to higher solution BGA content. Power law dependenceof 0.09 and -1.31 was found for the colloid particle size or sedimentation ratedependence on Ägmixc and the oil phase viscosity, respectively. Finally, the preparedcolloidal systems did not permeate through the membrane with 400 nm cross-throughchannels under 10 atm of nitrogen pressure, which was attributed to the oil phasenon-ionic surfactants adsorption on the membrane surfac
Keywords :
emulsification , nitrocellulose , non , ionic surfactant , stability , micro , filtration.
