Visualization of the lamellar structure of polyvinylidene fluoride using phase-plate scanning transmission electron microscopy

IF 4.1 2区 化学 Q2 POLYMER SCIENCE
Mayu Togashi, Kousuke Sugeno, Yuki Tanaka, Toshiki Shimizu, Hiromu Saito, Hiroki Minoda
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Abstract

Polyvinylidene fluoride (PVDF) is a crystalline polymer well-known for its excellent piezoelectric properties, flexibility, chemical resistance, heat resistance, and mechanical strength. PVDF exhibits crystal polymorphisms, with five reported crystal structures. Among these, the β-type structure has attracted much interest due to its superior piezoelectric properties; however, the details of its piezoelectric mechanism remain unclear. It is essential to evaluate the structure of PVDF at the nanoscale to elucidate its piezoelectric mechanism. In this study, as a first step toward elucidating its piezoelectric properties, we employed phase-plate scanning transmission electron microscopy (P-STEM) to observe heat-elongated PVDF. P-STEM is particularly effective in examining materials composed of light elements. We successfully visualized the lamellar structure, which was characterized by a layered arrangement of crystalline and amorphous regions. The period of the lamellar structure was approximately 7 nm, which was in good agreement with the results of small-angle X-ray scattering studies. In addition, high-magnification P-STEM images revealed that bundle-like structures oriented in the elongation direction were likely crystalline regions. This result indicates that P-STEM provides detailed local information regarding the orientation of the PVDF polymer chains.

Abstract Image

利用相板扫描透射电子显微镜观察聚偏氟乙烯的层状结构
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来源期刊
Polymer
Polymer 化学-高分子科学
CiteScore
7.90
自引率
8.70%
发文量
959
审稿时长
32 days
期刊介绍: Polymer is an interdisciplinary journal dedicated to publishing innovative and significant advances in Polymer Physics, Chemistry and Technology. We welcome submissions on polymer hybrids, nanocomposites, characterisation and self-assembly. Polymer also publishes work on the technological application of polymers in energy and optoelectronics. The main scope is covered but not limited to the following core areas: Polymer Materials Nanocomposites and hybrid nanomaterials Polymer blends, films, fibres, networks and porous materials Physical Characterization Characterisation, modelling and simulation* of molecular and materials properties in bulk, solution, and thin films Polymer Engineering Advanced multiscale processing methods Polymer Synthesis, Modification and Self-assembly Including designer polymer architectures, mechanisms and kinetics, and supramolecular polymerization Technological Applications Polymers for energy generation and storage Polymer membranes for separation technology Polymers for opto- and microelectronics.
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