Manipulation of ferroelectric response of PVDF-TRFE free-standing flexible films due to incorporation of BaTiO3 nanoparticle fillers

IF 3.1 3区化学 Q2 POLYMER SCIENCE

Polymer Bulletin Pub Date : 2024-09-10 DOI:10.1007/s00289-024-05483-8

G. Hassnain Jaffari, Hafsa Shawana, Fiza Mumtaz, M. Shahid Iqbal Khan, Musa Mutlu Can

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Abstract

The main objective of the present work is to get insight into the polarization switching and dielectric response of PVDF-TrFE with incorporation of BaTiO₃ (BTO) nanoparticles. For this purpose, cost-effective solvent casting technique was used, to prepare PVDF-TrFE/BaTiO₃ composite free-standing films. It is necessary to prepare films in which BTO nanoparticles are distributed homogenously without agglomeration. Surface functionalization technique is reported to be useful in homogenous distribution of the nanofiller in polymer matrix. However, addition of surface modifier causes reduction in the permittivity of the polymer nanocomposite and deteriorates the desired properties. Therefore, the main aim of the present work is to obtain homogenous free-standing PVDF-TrFE/BaTiO₃ composite films in which filler is dispersed without any use of surface modifier. Hence ferroelectric particles are dispersed in the ferroelectric polymer matrix. It has been observed that nanocomposite is much more complex compared to the simple models based on spheres dispersed in a medium. Complexities arise due to the strain and interfacial effects of the BTO nanoparticles on the ferroelectric matrix which exhibits marked effect on structural and electrical response of the system. Consequently, specific concentration of filler has been identified at which optimum ferroelectric and dielectric properties of PVDF-TrFE/BaTiO₃ composite have been achieved. Incorporation of more than a desired concentration of filler affects the chain alignment and causes reduction in the β-phase content. Correlation between structural and electrical response has been discussed in detail to explain the non-monotonic trend of polarization as a function of BTO content.

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通过加入 BaTiO3 纳米粒子填料操纵 PVDF-TRFE 独立柔性薄膜的铁电响应

本研究的主要目的是深入了解加入 BaTiO3 (BTO) 纳米粒子的 PVDF-TrFE 的极化转换和介电响应。为此，我们采用了经济有效的溶剂浇铸技术来制备 PVDF-TrFE/BaTiO3 复合独立薄膜。在制备薄膜时，BTO 纳米粒子必须均匀分布，不会聚集在一起。据报道，表面功能化技术有助于纳米填料在聚合物基体中的均匀分布。然而，表面改性剂的添加会导致聚合物纳米复合材料的介电常数降低，从而降低所需的性能。因此，本研究的主要目的是获得均匀的独立 PVDF-TrFE/BaTiO3 复合薄膜，其中的填料分散时不使用任何表面改性剂。因此，铁电粒子分散在铁电聚合物基体中。据观察，与基于分散在介质中的球体的简单模型相比，纳米复合材料要复杂得多。复杂性的产生是由于 BTO 纳米粒子对铁电基体的应变和界面效应，这对系统的结构和电气响应有明显影响。因此，已经确定了特定浓度的填料，从而使 PVDF-TrFE/BaTiO3 复合材料达到最佳的铁电和介电特性。掺入超过所需浓度的填料会影响链的排列，并导致 β 相含量减少。我们详细讨论了结构和电气响应之间的相关性，以解释极化随 BTO 含量变化的非单调趋势。

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来源期刊

Polymer Bulletin 化学-高分子科学

CiteScore

6.00

自引率

6.20%

发文量

审稿时长

5.5 months

期刊介绍： "Polymer Bulletin" is a comprehensive academic journal on polymer science founded in 1988. It was founded under the initiative of the late Mr. Wang Baoren, a famous Chinese chemist and educator. This journal is co-sponsored by the Chinese Chemical Society, the Institute of Chemistry, and the Chinese Academy of Sciences and is supervised by the China Association for Science and Technology. It is a core journal and is publicly distributed at home and abroad. "Polymer Bulletin" is a monthly magazine with multiple columns, including a project application guide, outlook, review, research papers, highlight reviews, polymer education and teaching, information sharing, interviews, polymer science popularization, etc. The journal is included in the CSCD Chinese Science Citation Database. It serves as the source journal for Chinese scientific and technological paper statistics and the source journal of Peking University's "Overview of Chinese Core Journals."