Crystallization behavior and electroactive properties of PVDF,P(VDF-TrFE) and their blend films |
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| Institution: | 1. College of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences (UCAS), Beijing, 100049, China;2. Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050, China;3. Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China;1. Center for Soft Condensed Matter Physics and Interdisciplinary Research, Soochow University, Suzhou 215006, China;2. School of Physical Science and Technology, Soochow University, Suzhou 215006, China;3. Institute of Condensed Matter and Nanosciences – Bio & Soft Matter (IMCN/BSMA), Université catholique de Louvain, Croix du Sud 1/L7.04.02, B-1348 Louvain-la-Neuve, Belgium;1. State Key Laboratory of ASIC and System, School of Microelectronics, Fudan University, Shanghai, China;2. Solid-State Electronics, The Ångström Laboratory, Uppsala University, P.O. Box 534, 75121 Uppsala, Sweden;1. National Research University of Electronic Technology “MIET”, 124498 Moscow, Russia;2. Institute of Mathematical Problems of Biology, Keldysh Institute of Applied Mathematics RAS, 142290 Pushchino, Moscow Region, Russia;3. Scientific-Practical Materials Research Centre of NAS of Belarus, 220072 Minsk, Belarus;4. TEMA-NRD, Mechanical Engineering Department and Aveiro Institute of Nanotechnology (AIN), University of Aveiro, 3810-193 Aveiro, Portugal;5. Tver State University, 170100 Tver, Russia;1. Matière Molle et Chimie, CNRS UMR-7167 ESPCI Paris, PSL Research University, 10 rue Vauquelin, 75005, Paris, France;2. Xenocs SA, 19, rue François Blumet, 38360, Sassenage, France;3. Piezotech S.A.S., Arkema - CRRA, rue Henri Moissan, 69493, Pierre-Bénite Cedex, France;1. Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, United Kingdom;2. Jeonju centre, Korea Basic Science Institute, Jeonju, Jeollabuk-do 561-180, Republic of Korea;3. Department of Electronic Engineering, Yeungnam University, Gyeongbuk 712-749, Republic of Korea;4. Department of Information and Communication Engineering, Daegu Gyeongbuk Institute of Science and Technology, Daegu 711-873, Republic of Korea |
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| Abstract: | PVDF, poly(vinylidene fluoride), as a semi-crystalline polymer, has interesting electroactive properties but usual melt and solution processing techniques result in its thermodynamically favored non-polar α-phase. By comparison, poly(vinylidene fluoride-trifluoroethylene) P(VDF-TrFE), PT for short, directly crystallizes in the polar β-phase under the same conditions as PVDF. In this study, blend thin films comprising PVDF and P(VDF-TrFE) were prepared by solvent casting method. The difference in the crystallization behavior is comprehensively investigated between the polymers: PVDF, P(VDF-TrFE), and the resulting blend films. It is found that replacement of the fluoride atom in TrFE monomer induces a strong steric hindrance that may alter the crystallization process to become more favorable for nucleation of the PVDF β-phase. To figure out the effect of TrFE content on the crystallization behavior and electroactive properties, films with different blend ratios of PVDF and P(VDF-TrFE) were prepared. We found that the PVDF films exhibit higher crystallization activation energy (ΔE) as PT content increases. The atomic force microscopy (AFM) in the piezoresponse force microscopy (PFM) mode illustrated that P5T5 films with equal contents of PVDF and P(VDF-TrFE) induced the highest d33 values. |
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| Keywords: | Poly(vinylidene fluoride) Poly(vinylidene fluoride-Trifluoroethylene) Crystallization Piezoelectric materials |
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