Stretchable co-continuous composite films with low Poisson's ratio using temperature-responsive cellulose fillers
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초록
내용
Recent research has focused on stretchable films for wearable devices, aiming to manage mechanical deformation. This study investigates the use of a reentrant structure with thermosensitive cellulose fillers to create a composite film with a low Poisson's ratio value. Composites of hydroxypropyl cellulose (HPC) and elastomeric silicone rubber were used to fabricate flexible auxetic films, with the HPC filler modified to possess a high porosity of over 90% through crystallization and freeze-drying. The porous HPC was then formed into reentrant structures through pre-strain, leveraging the shrinkage tendency of cross-linked HPC hydrogel with increasing temperature, followed by silicone rubber infiltration to create a co-continuous composite. In the tensile test, the film exhibited a low Poisson's ratio of 0.03, with the pre-straining while the film without pre-straining demonstrates relatively high Poisson's ratio. This composite film holds potential for application in flexible devices.