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[학술저널]

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박현지(서울대학교) 박희태(서울대학교) 이제곤(서울대학교) 이석호(서울대학교) 박신영(서울대학교) 윤혜정(서울대학교)

DOI : 10.7584/JKTAPPI.2019.08.51.4.36

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초록

In this study, the sedimentation behavior, dispersion stability, and rheological properties of a polyvinyl alcohol (PVA)-cellulose nanofibril (CNF) mixed suspension were investigated. The PVA-CNF suspension was prepared using different mixing ratios. Both the sedimentation behavior and dispersion stability were affected by the concentration of the suspension and the ratio of PVA and CNF. The dispersion stability was observed to be good when the concentration of the mixed suspension was more than 1%. However, when the concentration was less than 1%, particularly in case of low CNF content, sedimentation was observed, which means that constant stirring is necessary for stable use. The PVA-CNF suspension showed shear-thinning behavior, regardless of the CNF content. Furthermore, as the CNF content increased, the storage modulus and yield stress of the suspension increased, indicating that a suspension with high CNF content will yield a strong network structure.

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