| 초록 |
In the development of transparent and stretchable films, the problems related with film’s positive Poisson's ratio is have become a critical issue. In this research, we tried to solve the issue by lowering the value of Poisson's ratio through filler alignment. Cellulose nanocrystals (CNC) are used as fillers, and PDMS was used as an elastomeric matrix. CNCs were aligned by a directional freezing method. Thereafter, the pores were filled by PDMS infiltration and elasticity was imparted. The align of the film was confirmed by SEM cross-sectional analysis, and a value of 88 degrees was obtained through orientation degree measurement. In the tensile tests of the films, the average Poisson's ratio in the strain from 0.15 to 0.35 was found to be 0.075. The Poisson's ratios of composites showed a tendency to decrease due to the influence of the aligned fillers. |
