Understanding viscoelastic behavior of hybrid nanocellulose film based on rheological and electrostatic observation in blended suspension.

Minhyung Kim, Suhnue Kim, Nuri Han, Sanghyun Lee, Hyungsup Kim

Journal: Carbohydrate polymers 2022;300():120218

PMID: 36372470

Full Text on Elsevier Science View on PubMed

Abstract

The effects of TEMPO-mediated oxidized cellulose nanofibril (TOCN) on the viscoelastic behavior and phase of cellulose nanocrystal (CNC) in suspension and film were investigated using polarized optical microscopy, rotational rheometry, and dynamic mechanical analysis. The sodium cation from TOCN changed the electrostatic state of CNC by screening the CNC surface charge. The volume inflation of TOCN locally increased the CNC concentration in the suspension. In turn, the CNC-CNC interactions increased the viscosity and the yield stress. Based on the experimental observation, the changing mechanisms of electrostatic state and particular interaction in the TOCN/CNC suspensions were suggested. In the hybrid film, the time dependency of complex moduli was changed owing to the different networking between CNCs and TOCNs. The CNC-CNC contacts easily collapsed by strain, while the TOCN-TOCN entanglements were slowly altered. This study provides a fundamental understanding of CNC behavior for optimizing processes and composite properties.

Address: Department of Organic and Nano System Engineering, Konkuk University, Seoul 05029, Republic of Korea.; Department of Biological Engineering, Konkuk University, Seoul 05029, Republic of Korea.; Department of Organic and Nano System Engineering, Konkuk University, Seoul 05029, Republic of Korea. Electronic address: [email protected].

DOI: 10.1016/j.carbpol.2022.120218

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MeSH Terms: Suspensions, Static Electricity, Cellulose, Rheology, Viscosity, Cellulose, Oxidized