Miscibility between Cellulose Nanofiber and Polymer Emulsion：A Colloidal Science Perspective

Soeta Hiroto, Goi Yohsuke, Jinno Kazuhito

doi:10.2524/jtappij.75.990

<p>Cellulose nanofiber （CNF） has unique characteristics as rheology modifiers, dispersants, and reinforcing fillers. Incorporation of the CNF into waterborne polymer emulsion is required to improve the rheological properties of the emulsion and mechanical properties of resulting polymer materials such as film and coating. Miscibility between the CNF aqueous dispersion and the polymer emulsion, however, depends on types of polymers, and the miscibility trends are unclear. Therefore, we systematically investigated the contributions of the chemical compositions of polymer onto phase separation behavior of CNF dispersion/polymer emulsion mixture. It was found that the chemical compositions of polymer significantly affected the miscibility; the increase in the amount of anionic functional groups led to agglomeration of CNFs and emulsion particles. The result was discussed based on the theories in colloid science and suggests that repulsive force induced by electric double layers and attractive force induced by depletion effect competitively affected the dispersed particles. The increase in the surface charge is likely to enhance the depletion effect rather than the repulsive force, resulting in particle agglomeration. The chemical modification of polymer emulsion was then carried out to improve miscibility with the CNF dispersion. Accordingly, changing the anionic functional groups to nonionic groups led to obtaining a homogenous mixture of CNF dispersion and polymer emulsion. These findings pave the way to expanding the application of CNFs to paint and coating fields.</p>

Miscibility between Cellulose Nanofiber and Polymer Emulsion：A Colloidal Science Perspective

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