不同晶相组成的拉伸聚偏氟乙烯薄膜的松弛过程

IF 2.6 4区 化学 Q3 POLYMER SCIENCE Journal of Polymer Research Pub Date : 2024-10-26 DOI:10.1007/s10965-024-04154-6
Dmitrii Gerasimov, Natalia Nikonorova, Ivan Kuryndin, Viktor Lavrentyev, Sergei Bronnikov
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引用次数: 0

摘要

在聚合物熔融挤压的基础上,通过多级工艺获得了定向聚偏二氟乙烯(PVDF)薄膜。我们研究了单轴拉伸下 PVDF 薄膜中多晶体 α→β 结晶相变的结果。在单轴拉伸过程中,观察到极性压电活性晶体结构的出现和样品形态的显著变化。傅立叶变换红外光谱、广角 X 射线散射和扫描电子显微镜技术检测了 PVDF 薄膜形态、多晶体成分和超分子结构在转化过程中的变化。利用宽带介电光谱确定了聚合物链在α→β相变过程中分子流动性的变化。在介电损耗光谱中确定了 PVDF 的 α 相和β相中的 γ-、αа-、αс- 和界面极化等弛豫过程,并用 Arrhenius 或 Vogel-Fulcher-Tammann 方程进行了描述。通过对方程参数的分析,可以得出结论:通过单轴延伸引发的多态 α→β 转变会阻碍 PVDF 样品 β 相中弛豫器的移动性,但 γ-弛豫器除外。这一发现证实了γ-松弛子位于 PVDF 无定形部分的说法。单轴延伸导致界面极化显著增加,这可能是由于出现了新的界面边界。
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Relaxation processes in the oriented polyvinylidene fluoride films with various crystalline phase composition

Oriented polyvinylidene fluoride (PVDF) films were obtained in multistage process based on melt extrusion of polymer. We investigated the results of the polymorphic α→β crystalline phase transformation in the PVDF films subjected to uniaxial stretching. During uniaxial extension both appearance of a polar piezo active crystalline structure and significant changes in the samples morphology were observed. Variations in the PVDF films morphology, polymorphic composition, and supramolecular structure upon transformation were detected with Fourier transform infrared spectroscopy, wide-angle X-ray scattering, and scanning electron microscopy techniques. Broadband dielectric spectroscopy was used to ascertain a change in molecular mobility of the polymer chains during α→β phase transformation. The relaxation processes, γ-, αа-, αс-, and interfacial polarization, in both α- and β-phases of PVDF were identified in the dielectric loss spectra and described with either Arrhenius or Vogel-Fulcher-Tammann equations. The analysis of the equations parameters allowed concluding that initiation of a polymorphic α→β transition through uniaxial extension results in hindering the relaxators mobility in the β-phase of PVDF samples, except γ-relaxators. This finding confirms a proposal that γ-relaxators are located in the amorphous part of PVDF. Uniaxial extension resulted in a substantial increase in the interfacial polarization, which can be attributed to the emergence of new interface boundaries.

Graphical abstract

A higher resolution version of the Graphical abstract is available as Supplementary information

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来源期刊
Journal of Polymer Research
Journal of Polymer Research 化学-高分子科学
CiteScore
4.70
自引率
7.10%
发文量
472
审稿时长
3.6 months
期刊介绍: Journal of Polymer Research provides a forum for the prompt publication of articles concerning the fundamental and applied research of polymers. Its great feature lies in the diversity of content which it encompasses, drawing together results from all aspects of polymer science and technology. As polymer research is rapidly growing around the globe, the aim of this journal is to establish itself as a significant information tool not only for the international polymer researchers in academia but also for those working in industry. The scope of the journal covers a wide range of the highly interdisciplinary field of polymer science and technology, including: polymer synthesis; polymer reactions; polymerization kinetics; polymer physics; morphology; structure-property relationships; polymer analysis and characterization; physical and mechanical properties; electrical and optical properties; polymer processing and rheology; application of polymers; supramolecular science of polymers; polymer composites.
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