Surface topography and crystal and domain structures of films of ferroelectric copolymer of vinylidene difluoride and trifluoroethylene
Surface topography and crystal and domain structures of films of ferroelectric copolymer of vinylidene difluoride and trifluoroethylene
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DOI：
10.1134/s1063774517020146
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发表时间：
2017-03-01
影响因子：
0.7
通讯作者：
Pavlov, A. S.
中科院分区：
文献类型：
--
作者：
Kochervinskii, V. V.;Kiselev, D. A.;Pavlov, A. S.
发现共聚物在室温下从溶液中结晶时会形成亚稳态结构，其特征是铁电相和顺电相共存。在居里点以上退火后，后者的比例降低。原子力显微镜(AFM)显示了与空气接触的薄膜和与玻璃衬底接触的薄膜的表面形貌不同。用F-19核磁共振波谱研究了共聚物链的微观结构。带有“缺陷”的单体单元的链段被喷射到表面。分析了晶化过程中形成的铁电畴的特征及其尺寸分布。
The crystallization of a copolymer from a solution at room temperature is found to lead to the formation of a metastable structure, characterized by the coexistence of ferroelectric and paraelectric phases. The fraction of the latter decreases after annealing above the Curie point. Atomic force microscopy (AFM) has revealed a difference in the surface topographies between the films contacting with air and the films contacting with a glass substrate. The microstructure of copolymer chains has been investigated by F-19 NMR spectroscopy. The chain fragments with "defect" attached monomeric units are ejected to the surface. The character of the ferroelectric domains formed during crystallization and their size distribution are analyzed.