3D Printing Modulated Polymer Crystal to Prepare Polymer Films with High Piezoelectric Properties
Poly(vinylidene fluoride)(PVDF)-based polymer film materials are widely utilized in wearable sensing devices due to their exceptional mechanical flexibility and ease of processing.To address the issue of the low piezoelectric performance of PVDF-based polymers,we developed a technique for modulating their molecular composition and structural aggregation state.We prepared and modulated the composition and structure of poly(vinylidene fluoride)-trifluoroethylene(P(VDF-TrFE))molecular chains through hydrodynamic reduction and 3D printing,aiming to increase the content of its β-phase and achieve the all-trans arrangement of its internal C-F bonds.The crystalline structure and piezoelectric properties of P(VDF-TrFE)were compared before and after modification,revealing the mechanism behind the enhancement of its piezoelectric properties.The results demonstrate that,in comparison to the original poly(vinylidene fluoride)-chlorotrifluoroethylene(P(VDF-CTFE))and the flow-cast P(VDF-TrFE),the β-phase content of the P(VDF-TrFE)film prepared by hydrogenation reduction and 3D printing reached 21%,with the piezoelectric coefficient increasing from 6 pC/N to 25 pC/N.The resulting P(VDF-TrFE)film exhibits excellent mechanical properties,presenting a promising avenue for advancing integrated materials for sensor-driven applications.
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