Multiple stage crystallization of gamma phase poly(vinylidene fluoride) induced by ion-dipole interaction as revealed by time-resolved FTIR and two-dimensional correlation analysis

Li, Yue; Xu, Jia‐Zhuang; Zhu, Lei; Xu, Huan; Pan, Mingwang; Zhong, Gan‐Ji; Li, Zhong‐Ming

doi:10.1016/j.polymer.2014.07.022

Cited by 43 publications

(53 citation statements)

References 63 publications

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“…1c), higher than for any other reported method (max 85% by unidirectional/biaxial drawing, as highlighted by the horizontal green shaded area in Fig. 1c) 16,35–38 . The analysis of PVDF phase content has been well studied in previous research works 36–38 , which includes the determination of existing phases according to the appearance of exclusively characteristic bands (e.g.…”

Section: Resultsmentioning

confidence: 58%

“…1c) 16,35–38 . The analysis of PVDF phase content has been well studied in previous research works 36–38 , which includes the determination of existing phases according to the appearance of exclusively characteristic bands (e.g. α-phase: 764 cm −1 ; β-phase: 1275 cm −1 and γ-phase: 1234 cm −1 listed in Supplementary Table 2) and then calculation using specific equations based on the sample containing α- and β- phase only or containing a mixture of α-, β- and γ-phase.…”

Section: Resultsmentioning

confidence: 99%

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Ultrahigh β-phase content poly(vinylidene fluoride) with relaxor-like ferroelectricity for high energy density capacitors

et al. 2019

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Poly(vinylidene fluoride)-based dielectric materials are prospective candidates for high power density electric storage applications because of their ferroelectric nature, high dielectric breakdown strength and superior processability. However, obtaining a polar phase with relaxor-like behavior in poly(vinylidene fluoride), as required for high energy storage density, is a major challenge. To date, this has been achieved using complex and expensive synthesis of copolymers and terpolymers or via irradiation with high-energy electron-beam or γ-ray radiations. Herein, a facile process of pressing-and-folding is proposed to produce β-poly(vinylidene fluoride) (β-phase content: ~98%) with relaxor-like behavior observed in poly(vinylidene fluoride) with high molecular weight > 534 kg mol−1, without the need of any hazardous gases, solvents, electrical or chemical treatments. An ultra-high energy density (35 J cm−3) with a high efficiency (74%) is achieved in a pressed-and-folded poly(vinylidene fluoride) (670-700 kg mol−1), which is higher than that of other reported polymer-based dielectric capacitors to the best of our knowledge.

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Section: Resultsmentioning

confidence: 58%

Section: Resultsmentioning

confidence: 99%

Ultrahigh β-phase content poly(vinylidene fluoride) with relaxor-like ferroelectricity for high energy density capacitors

et al. 2019

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“…A significant way to recognise the polymorphism of PVDF is via FTIR spectroscopy . Each crystalline phase has its specific peaks.…”

Section: Resultsmentioning

confidence: 99%

Nanophase morphology and crystallization in poly(vinylidene fluoride)/polydimethylsiloxane‐block‐poly(methyl methacrylate)‐block‐polystyrene blends

Seraji

Guo

2019

Polymer International

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An approach to achieve confined crystallization of ferroelectric semicrystalline poly(vinylidene fluoride) (PVDF) was investigated. A novel polydimethylsiloxane-block-poly(methyl methacrylate)-block-polystyrene (PDMS-b-PMMA-b-PS) triblock copolymer was synthesized by the atom-transfer radical polymerization method and blended with PVDF. Miscibility, crystallization and morphology of the PVDF/PDMS-b-PMMA-b-PS blends were studied within the whole range of concentration. In this A-b-B-b-C/D type of triblock copolymer/homopolymer system, crystallizable PVDF (D) and PMMA (B) middle block are miscible because of specific intermolecular interactions while A block (PDMS) and C block (PS) are immiscible with PVDF. Nanostructured morphology is formed via self-assembly, displaying a variety of phase structures and semicrystalline morphologies. Crystallization at 145 ∘ C reveals that both and crystalline phases of PVDF are present in PVDF/PDMS-b-PMMA-b-PS blends. Incorporation of the triblock copolymer decreases the degree of crystallization and enhances the proportion of to phase of semicrystalline PVDF. Introduction of PDMS-b-PMMA-b-PS triblock copolymer to PVDF makes the crystalline structures compact and confines the crystal size. Moreover, small-angle X-ray scattering results indicate that the immiscible PDMS as a soft block and PS as a hard block are localized in PVDF crystalline structures. RESULTS AND DISCUSSION Characterization of PDMS-b-PMMA-b-PS triblock copolymerThe final copolymer, PDMS-b-PMMA-b-PS, was characterized using 1 H NMR. The -SiCH 3 group of PDMS block, the -OCH 3 group of PMMA block and the -C 6 H 5 of PS gave three characteristic peaks, as shown in Fig. 2, centred at 0 .0, 3.63 and 6.5-7.16 ppm, respectively. 32 According to the above results, the molecular weights (M n ) of PMMA and PS are 10 300 and 6300 g mol −1 , respectively. The total M n of the PDMS-b-PMMA-b-PS triblock copolymer is 21 300 g mol −1 . Figure S1 presents the FTIR spectrum of the PDMS-b-PMMA-b-PS triblock copolymer. The presence of the characteristic bands of each block of the synthesised triblock copolymer analysed and the details are presented in Table S1.

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“…24,25 They also revealed that a higher g phase content could be obtained by increasing the isothermal crystallization temperature to about 170 C. The presence of a crystal nuclei during the isothermal crystalization would also enhance the formation of g spherulites. [26][27][28] The aforementioned fabrication methods have focused on the processing of pure PVDF but there are also researches that investigated the addition of ferrite nanollers to promote the nucleation of b phase 29 and g phase 30 crystals. It has been observed that the interaction between the negatively charged surfaces of the nanoparticles and the positive CH 2 bonds of the PVDF allowed the molecular chain groups to rearrange themselves into the electroactive phase conformations.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of electroactive poly(vinylidene fluoride) through non-isothermal crystallization and supercritical CO₂ processing

et al. 2017

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Multiple stage crystallization of gamma phase poly(vinylidene fluoride) induced by ion-dipole interaction as revealed by time-resolved FTIR and two-dimensional correlation analysis

Cited by 43 publications

References 63 publications

Ultrahigh β-phase content poly(vinylidene fluoride) with relaxor-like ferroelectricity for high energy density capacitors

Ultrahigh β-phase content poly(vinylidene fluoride) with relaxor-like ferroelectricity for high energy density capacitors

Nanophase morphology and crystallization in poly(vinylidene fluoride)/polydimethylsiloxane‐block‐poly(methyl methacrylate)‐block‐polystyrene blends

Fabrication of electroactive poly(vinylidene fluoride) through non-isothermal crystallization and supercritical CO₂ processing

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Multiple stage crystallization of gamma phase poly(vinylidene fluoride) induced by ion-dipole interaction as revealed by time-resolved FTIR and two-dimensional correlation analysis

Cited by 43 publications

References 63 publications

Ultrahigh β-phase content poly(vinylidene fluoride) with relaxor-like ferroelectricity for high energy density capacitors

Ultrahigh β-phase content poly(vinylidene fluoride) with relaxor-like ferroelectricity for high energy density capacitors

Nanophase morphology and crystallization in poly(vinylidene fluoride)/polydimethylsiloxane‐block‐poly(methyl methacrylate)‐block‐polystyrene blends

Fabrication of electroactive poly(vinylidene fluoride) through non-isothermal crystallization and supercritical CO2 processing

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Fabrication of electroactive poly(vinylidene fluoride) through non-isothermal crystallization and supercritical CO₂ processing