Peculiarities of structure and dielectric relaxation in ferroelectric vinylidene fluoride-tetrafluoroethylene copolymer at different crystallization conditions

被引：4

作者：

Kochervniskii, V. V. ^{[1
]}

Astakhov, V. A. ^{[2
]}

Bedin, S. A. ^{[3
]}

Malyshkina, I. A. ^{[4
]}

Shmakova, N. A. ^{[5
]}

Korlyukov, A. A. ^{[6
]}

Buzin, M., I ^{[6
]}

Volkov, V. V. ^{[7
]}

机构：

[1] Karpov Inst Phys Chem, Vorontsovo Pole 10, Moscow 105064, Russia

[2] Natl Univ Sci & Technol MISiS, Leninsky Pr 4, Moscow 119049, Russia

[3] Moscow State Pedag Univ, M Pinagovskaya Str 1-1, Moscow 119991, Russia

[4] Moscow MV Lomonosov State Univ, Fac Phys, Leninskie Gory 1 Bld 2, Moscow 119991, Russia

[5] Russian Acad Sci, Enikolopov Inst Synthet Polymer Mat, Profsoyuznaya 70, Moscow 117393, Russia

[6] Russian Acad Sci, AN Nesmeyanov Inst Organoelement Cpds, Vavilova Str 28, Moscow 119991, Russia

[7] Russian Acad Sci, Shubnikov Inst Crystallog, Fed Sci Res Ctr Crystallog & Photon, Moscow 119333, Russia

来源：

COLLOID AND POLYMER SCIENCE | 2020年 / 298卷 / 09期

基金：

俄罗斯基础研究基金会;

关键词：

VDF; TFE copolymer; Crystallization; Dielectric relaxation; POLY(VINYLIDENE FLUORIDE); POLYMERS; PIEZOELECTRICITY; POLARIZATION; HYDROPHONE; VISCOSITY; FEATURES; PVDF;

D O I：

10.1007/s00396-020-04691-8

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Vinylidene fluoride (VDF)/tetrafluoroethylene (TFE) 94/6 copolymer films obtained by low-temperature crystallization from acetone solution and by melt-crystallization under high pressure were studied. As shown in the X-ray diffraction patterns, beta- and gamma- phases coexist in the sample crystallized from a solution. At melt-crystallization, a number of gamma-crystals decrease and spherulitic supramolecular structure is formed. It is accompanied by a decrease of the amorphous phase density in the intra- and inter-spherulite regions, which leads to an increase in the glass transition temperature. Differential scanning calorimetry data indicate a smaller fraction of the amorphous phase for the sample crystallized from the melt. At the same time, the relaxation strength of the mobility in the amorphous phase in this sample is higher. This contradiction is explained by the increased ratio of isomers in planar zigzag conformation, as shown by IR spectroscopy.

引用

页码：1169 / 1178

页数：10

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