Cellulose nanocrystal based transparent electroactive polyurethane for active lens application

초록

Cellulose nanocrystal (CNC) is known to be a good source for structural material due to its impressively high mechanical properties and it is also an excellent dielectric filler due to its electrical polarity originated from its crystal structure. This paper reports a soft electro-active polymer made by blending CNC with poly(urethane), which is named as CPPU. CPPU is an electro-active dielectric elastomer, applicable for smart and active lens. In CPPU, CNC plays the role of filler that improves dielectric constant. For homogeneous distribution of CNC in poly(urethane) matrix, hydrogen boned CNCpoly[di(ethylene glycol) adipate] (PDEGA) was prepared by simple blending as diol of urethane bond. Hexamethylene diisocyanate was used for isocyanate salt as cross-linker. The prepared CPPU exhibits high transparency above 90% and excellent dielectric constant. As a result, the CPPU dielectric elastomer shows large deformation under low electric field. Transparency and large deformation behaviors of CPPU are attractive for smart and active lens applications.

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