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The Formation and Elasticity of a Hydroxypropyl Cellulose Film at a Water–Air Interface

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Abstract

The kinetics of spreading of aqueous hydroxypropyl cellulose (HPC) solutions with different concentrations over a water surface and the rheological properties of films formed at the water–air interface have been studied. The performed experiments are distinguished by the fact that the solvent in the polymer solutions is identical to the liquid subphase, while, beginning from a certain concentration, the aqueous HPC solutions are capable of forming a liquid-crystalline phase. The chosen initial polymer solution concentrations correspond to different regions of the phase diagram for the HPC–water system. The contact of a solution droplet with water yields a time-stable spot of an HPC solution layer. In spite of the fact that some solution concentrations correspond to the existence range of a lyotropic liquid-crystalline phase, an isotropic layer is formed on the water surface irrespective of the concentration and phase state of the solution in the droplet. The dynamic dilatational storage modulus of such an interfacial layer at a frequency of 0.03 Hz is equal to 43 ± 2 mN/m; i.e., it almost coincides with the surface tension of the formed interfacial layer.

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ACKNOWLEDGMENTS

We are grateful to Prof. B.A. Noskov and Cand. of Chemistry A.G. Bykov (Institute of Chemistry, St. Petersburg State University) for dynamic measurements of the interfacial layers and Profs. S.N. Chvalun and A.V. Bakirov (National Research Centre Kurchatov Institute) for help in carrying out X-ray diffraction measurements.

FUNDING

The sample preparation and the development of the experimental methods for studying the kinetics of HPC solution spreading over a liquid surface were performed within the framework of the state order to the Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences. The measurements and the processing and discussion of the obtained experimental data were supported by the Russian Foundation for Basic Research (project no. 18-29-17002) .

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Correspondence to A. A. Maklakova.

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Translated by A. Kirilin

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Maklakova, A.A., Kulichikhin, V.G. & Malkin, A.Y. The Formation and Elasticity of a Hydroxypropyl Cellulose Film at a Water–Air Interface. Colloid J 81, 696–702 (2019). https://doi.org/10.1134/S1061933X19060103

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