Auxetic and conductive films obtained by cellulose alignment and shrinkage process
발표자
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초록
내용
There is a problem related to Poisson's ratio in stretchable wearable electronic devices. The Poisson's ratio of general rubber is 0.5, but a positive Poisson's ratio gives problems to film stretching and shrinkage. In this study, we try to solve the problem by aligning the filler and fabricating a reentrant structure to lower the Poisson's ratio. Hydroxypropyl cellulose (HPC) is used as a filler and ecoflex is used as an elastomer matrix. Ag is used as a conductivity agent. The HPC is aligned by the directional freezing method and Ag is coated on the surface of the filler. After that, the reentrant structure is fabricated by inducing pore shrinkage of HPC. Elasticity was imparted to the constricted pores by infiltrating ecoflex. The prepared HPC filler has a structure aligned vertically. Observing the cross-section in the vertical direction of the pores can confirm the reentrant pores. This film research can be applied to various materials through physical property supplementation.