Novel electroactive polymer system - PVDF based polymer blends

摘要

In this paper, we report a new electroactive polymer system, blends of P(VDF-TrFE) and P(VDF-CTFE). The thermal transition behavior and crystalline structure of the polymer blends were studied using the DSC and X-ray diffraction. The optimized thermal treating condition and composition for the blends were identified to have homogeneous materials. In order to find blends with high electromechanical performance, the maximum polarization level and the ratio of maximum polarization to remnant polarization are employed as key parameters to optimize the composition and process. Uniaxially stretching technique was employed to modify the morphology of the polymer blends and to enhance the electromechanical performance. The phase transition behavior can be significantly modified using thermal treating condition. In a stretched polymer blend, a polarization level about 60 mC/m~2 at external electric field of 150 V/μm was obtained with a small remnant polarization, less than 10 mC/m~2. This is very attractive for electromechanical applications.