Viscosity Evaluation of Cellulose Nanofiber-Reinforced Composite

Cellulose is the main component of the cell walls of plant cells, cotton, and other materials. It is the most abundant carbohydrate on Earth and has a long history of use as a raw material for paper and textiles. Cellulose nanofiber (hereinafter, CNF) with higher functionality realized by defibrating cellulose to the nano level has been focused in recent years. As a plant-derived material, CNF has a low environmental impact, and also has various desirable functions including low linear expansion, a gas barrier property, and transparency. It is lightweight, weighing only 1/5 as much as steel, and displays high specific strength, being 5 to 8 times stronger than ferrous materials. Therefore, research aimed at developing high strength, lightweight composite materials by strengthening thermoplastic resins with CNF is progressing. One of the features of thermoplastic resins is good productivity. Many mass-produced molded resin products are molded by melting the resin by techniques such as injection molding or extrusion molding. For example, in injection molding, the proper temperature and pressure differ depending on the type of resin, the mold shape, and other factors. Poor conditions can cause molding defects including short shot (underfilling), overcharge, sink mark, and voids. Moreover, even if molding is performed under the proper conditions, changes in the condition of the raw material resin can lead to molding defects. Thus, it is essential to determine the optimum molding conditions for CNFreinforced composite materials. As one technique for evaluating these moldability properties of thermoplastic resins, in this study, fluidity was evaluated by using a Shimadzu CFT-EX flowtester. Fig. 1 shows the measuring instrument. Three types of measurement samples, i.e., CNF-reinforced composite, glass fiber (GF)-reinforced plastics, and a simple resin without reinforcement, were used.

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Application News
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Material Testing, Hardness Testing / Viscosity & Flow Testing
Materials/Automotive, Additive Manufacturing, CFT-100/500 EX Flowtester
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Viscosity-Evaluation-of-Cellulose-Nanofiber-Reinforced Composite.pdf
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