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http://dx.doi.org/10.14775/ksmpe.2021.20.11.001

Heat-Treated Polyvinyl Alcohol/Cellulose Nanocrystal Film with Improved Mechanical Properties and Water Resistance  

Nguyen, Son Van (School of Mechanical Engineering, Chonnam National University)
Lee, Bong-Kee (School of Mechanical Engineering, Chonnam National University)
Publication Information
Journal of the Korean Society of Manufacturing Process Engineers / v.20, no.11, 2021 , pp. 1-8 More about this Journal
Abstract
In this study, the water resistance and mechanical properties of heat-treated polyvinyl alcohol (PVA)/cellulose nanocrystal (CNC) films were investigated. PVA is the most commonly used synthetic biodegradable polymers owing to its excellent properties. However, the water/moisture sensitivity and relatively poor mechanical properties of PVA limits its applications. Although heat treatment is a conventionally used method to improve the mechanical strength and water resistance of PVA, the effectiveness of this method is insufficient. Therefore, CNC was used to further improve the mechanical properties and water resistance of the heat-treated PVA film. PVA/CNC nanocomposites containing CNC contents of 0, 1, 3, 5, and 10 wt% were fabricated using solvent casting and subsequent heat treatment. The mechanical properties and water resistance of PVA/CNC films were significantly improved. The tensile strength and wet strength of the PVA/CNC film with a CNC content of 5 wt% (PVA/CNC 5%) were 184.5% and 136.0% higher than those of the untreated PVA, respectively. In addition, the water absorption and solubility of PVA/CNC 5% were 56.6% and 68.2% lower than those of the untreated PVA.
Keywords
Polyvinyl alcohol; Cellulose nanocrystal; Water resistance; Mechanical properties;
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