Energy harvesting from a thin polymeric film based on PVDF-HFP and PMMA blend
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Energy harvesting from a thin polymeric film based on PVDF‑HFP and PMMA blend Kinyas Polat1 Received: 23 April 2020 / Accepted: 2 June 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Herein, a thin polymeric film prepared by spin coating technique using the blend of poly(vinylidene floride-co-hexafluoropropylene) (PVDF-HFP) and poly(methyl methactrylate) PMMA (1:1 mixing ratio) was introduced and compared with the pure PVDF-HFP. SEM, XRD, FTIR, TGA and DSC characterizations were conducted. Piezoelectric response was measured by hand made setup and the produced signal measured by a digital oscilloscope. Blending with PMMA increased the β-phase content, improved the heat stability. Crystallization point decreased from 140 to 129 °C and glass transition temperature changed from 59 to 94 °C. A uniform porous film structure was obtained with a thickness value of 12 µm. Piezoelectric potential obtained by applying mechanical force was found 4.385 V and 8.101 V for pure PVDF-HFP and the blend film, respectively. 84.7% increase found in the piezoelectric potential could be a promising result for energy harvesting and sensors applications. Graphic abstract
Keywords Piezoelectricity · PVDF-HFP · PMMA · Isotactic · Syndiotactic · β Phase
1 Introduction Energy harvesting is defined as capturing or scavenging energy from the surround by using various techniques to supply energy especially for the battery powered devices where charging or replacement of the battery is inefficient. From daily life usage to medical or military applications, such as pressure monitoring systems, implanted sensor nodes, * Kinyas Polat [email protected] 1
Department of Chemistry, Faculty of Science, Dokuz Eylul University, 35390 Izmir, Turkey
unmanned vehicles, running military security systems, the importance of energy harvesting is increasing day by day [1]. With the growth of microelectromechanical system (MEMS) technologies, micro energy harvesting has become more and more focus of the researches in the recent decade. Some of the micro energy harvesting sources are motion, vibration (or mechanical energy), object’s movement, pavement, stairs etc. Energy harvesting from these sources can be achieved by electromagnetic, electrostatic, piezoelectric transducers and triboelectric generators which is based on contact electrification between two different layers [2–6]. Piezoelectric materials can be divided into two class as piezoceramics
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and piezopolymers. Although piezoceramics produce high voltage output, they are brittle and not suitable for most applications. On the other hand, piezopolymers are flexible materials with enough voltage output but not as much as piezoceramics. Mechanical flexibility and processability into different shapes makes the piezopolymers very attractive materials for the researchers [7]. As being one of the most important piezopolymeric material, poly(vinylidene floride) (PVDF) is a very special polymer having high chemical and me
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