Abstract
The interaction between nonionic derivatives of cellulose, hydroxypropylmethyl cellulose (HPMC) and methyl cellulose (MC), and ionic surfactant, sodium dodecylsulfate (SDS) were investigated by conductometric titration method, at 30°C. Obtained titration curves show two break points: critical aggregation concentration (cac) defined as the concentration of SDS at which interaction starts, and polymer saturation concentration (psp) as the concentration at which interaction finishes. Changes of characteristic concentration breaks were determined in dependence on concentration and molecular characteristics of cellulose derivatives (degree of substitution (DS) and molecular mass, i.e. intrinsic viscosity). It was shown that the first break point, cac, is independent of polymer concentration; while the second break point, psp, increases as polymer concentration increases, as described by a linear correlation. The slopes of linear relationship justify the DS on the intensity of the cellulose derivatives–SDS interaction. Changes in the intrinsic viscosity of cellulose derivatives do not exhibit influence on the interaction with SDS.
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Acknowledgements
This work was supported by the Ministry of Science and Environmental Protection of the Republic of Serbia (Grant Number 0426). The authors are thankful to Colorcon Ltd. (England) for their generous gift of the HPMC sample.
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Sovilj, V.J., Petrović, L.B. Influence of molecular characteristics of nonionic cellulose ethers on their interaction with ionic surfactant investigated by conductometry. Colloid Polym Sci 284, 334–339 (2005). https://doi.org/10.1007/s00396-005-1376-4
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DOI: https://doi.org/10.1007/s00396-005-1376-4