Abstract
In this study, piezoelectric performance of polyvinylidene fluoride (PVDF) is enhanced by facile blending with aromatic hyperbranched polyester of 1st generation (Ar.HBP-G1). Prior to blending with PVDF, Ar.HBP-G1 was synthesized by one-shot polycondensation technique using pentaerythritol (as core) and diphenolic acid (as AB2 type monomer), and analyzed by different spectroscopic (FTIR-ATR, NMR) techniques. PVDF with varying Ar.HBP-G1 content (0, 10, 20, 30 and 40 wt.-%) were blended to obtain electrospun fibers, and their morphology examined by FE-SEM and crystallization behavior analyzed using FTIR and XRD. As-prepared electrospun PVDF/Ar.HBP-G1 composite nanofibers (NFs) were used to fabricate piezoelectric nanogenerator (PENG) using Ni-Cu coated conductive fabric as electrodes. Piezoelectric performance was evaluated by employing a periodic load of 1.0 kgf at a constant frequency of 1.0 Hz. Among the five different PENG samples used in our study, the peak-to-peak output voltage (Vp-p) for PVDF-Ar.HBP-G1 (10 wt.-%) NF showed almost three times (4.28 V) better piezoelectric response compared to neat PVDF (1.89 V). The optimized sample (Ar.HBP-G1 (10 wt.-%)) subjected to varying load (1 to 3 kgf) and frequency (0.1 to 1.0 Hz) showed maximum Vp-p of 4.28 V under 1 kgf and 1.0 Hz. Further, the PENG was employed for portable and human health monitoring energy harvesting applications.
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Acknowledgements
The authors are grateful to Prof. Hongdoo Kim and Prof. Kap Jin Kim, Kyung Hee University, Republic of Korea for providing the piezoelectric measurement facility and to Dr. Mohammad Shamim Reza for assisting the piezoelectric measurements in their facility.
Funding
The research leading to these results received funding from CSIR, Government of India CSIR-EMR-II scheme (03(1450)18/EMR-II dt.05-06-2018).
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Gunasekhar, R., Prabu, A.A. Fabrication of 1st generation aromatic hyperbranched polyester/ polyvinylidene fluoride blended electrospun composites to enrich the piezoelectric performance. J Polym Res 30, 287 (2023). https://doi.org/10.1007/s10965-023-03675-w
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DOI: https://doi.org/10.1007/s10965-023-03675-w