Effect of aspect ratio of cellulose nanofiber (CNF) on physical properties of the polymer composites prepared via a melt-mixing process
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Cellulose is one of the most abundant eco-friendly natural polymer. Cellulose nanofiber (CNF) is produced by grinding or homogenization of pulp which is obtained by removing lignin and hemicellulose from woods through chemical and mechanical treatment. CNF has high mechanical strength comparable to glass fiber or carbon fiber. Therefore, CNF as a filler for reinforcement of polymer has been studied. However poor dispersion and thermal degradation in a melt mixing process were major drawbacks for commercialization. In this study, CNF was surface-modified with inorganic materials and mixed with thermoplastic polymers using a twin screwed melt-mixer, showing well dispersion and thermal resistance. We investigated mechanical, optical and rheological properties of the composites in terms of amount of inorganic material on the surface and CNF aspect ratio.