セルロースナノファイバー／ポリ乳酸複合材料の力学的特性に及ぼす熱処理温度の影響

抄録

Cellulose Nano Fiber (CNF) and Poly(lactic acid) (PLA) are known to have low adhesion. In conventional research, complex processes such as the use of additives are required to improve adhesion. In this study, PLA is shrunk by crystallization during heat treatment. This shrinkage is thought to improve adhesion. In this study, changes in the mechanical properties of CNF/PLA composites were investigated by varying the CNF content (0 and 10 mass%) and heat treatment conditions (3.5 hours at 70°C, and 130°C). Mechanical properties were investigated by tensile tests. The effect of annealing on the mechanical properties of CNF/PLA was investigated by tensile tests. The results showed that annealing and compositing with CNF reduced tensile strength and strain at break, and increased elastic modulus. Annealing of PLA resulted in an increase in PLA density and a shrinkage rate of 1.286%. These results suggest that the improvement in elastic modulus is due to the high elastic modulus of CNF and the improvement in adhesion between CNF and PLA due to crystallization.