New crystal structure and discharge efficiency of poly(vinylidene fluoride-hexafluoropropylene)/poly(methyl methacrylate) blend films

Peng, Guirong; Zhao, Xiaojia; Zhan, Zaiji; Ci, Shengzong; Wang, Qian; Liang, Yanjuan; Zhao, Mi

doi:10.1039/c3ra47462c

Cited by 68 publications

(46 citation statements)

References 19 publications

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“…FTIR analysis was conducted for PVDF-HFP and PVDF-HFP/CB in the conditions to evaluate the effects of IR-treatment and addition of DEC to the film. Peaks reported in this section with suggested structural features noted in parenthesis (suggested features are within 1 or 2 cm −1 of peaks reported elsewhere for PVDF or PVDF-HFP [39,40,41,42,43,44,45,46,47,48,49,50,51,52]). …”

Section: Materials Characterization Results and Discussionsupporting

confidence: 52%

“…The extensive changes to the PVDF-HFP FTIR peaks on addition of CB demonstrate the crystal structure of the polymer undergoes structural changes in formation of the composite. Peaks in PVDF-HFP at 511 cm −1 (CF 2 [40], β-phase [41]), 658 cm −1 , 838 cm −1 (CH 2 rocking [33], β-phase [43]), 880 cm −1 (CF 2 stretching [42], α-phase [41], 1073 cm −1 (out of plan deformation [44]), 1178 cm −1 (asymmetric stretching of C-F bond [45]), 1231 cm −1 (γ-phase [46]), 1404 cm −1 (CH 2 wagging [47]), are shifted in PVDF-HFP/CB to 509 cm −1 , 656 cm −1 , 835 cm −1 (gamma phase [46]), 876 cm −1 , 1069 cm −1 , 1167 cm −1 , 1229 cm −1 , 1399 cm −1 . The peak at 1680 cm −1 (symmetrical stretching vibration of C=C [48]) has disappeared but new peaks are observed due to insertion of CB and formation of the composite.…”

Section: Materials Characterization Results and Discussionmentioning

confidence: 99%

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Cross-Selectivity Enhancement of Poly(vinylidene fluoride-hexafluoropropylene)-Based Sensor Arrays for Detecting Acetone and Ethanol

Daneshkhah

Shrestha

Siegel

et al. 2017

Sensors

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Two methods for cross-selectivity enhancement of porous poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP)/carbon black (CB) composite-based resistive sensors are provided. The sensors are tested with acetone and ethanol in the presence of humid air. Cross-selectivity is enhanced using two different methods to modify the basic response of the PVDF-HFP/CB sensing platform. In method I, the adsorption properties of PVDF-HFP/CB are altered by adding a polyethylene oxide (PEO) layer or by treating with infrared (IR). In method II, the effects of the interaction of acetone and ethanol are enhanced by adding diethylene carbonate (DEC) or PEO dispersed in DEC (PEO/DEC) to the film. The results suggest the approaches used in method I alter the composite ability to adsorb acetone and ethanol, while in method II, they alter the transduction characteristics of the composite. Using these approaches, sensor relative response to acetone was increased by 89% compared with the PVDF-HFP/CB untreated film, whereas sensor relative response to ethanol could be decreased by 57% or increased by 197%. Not only do these results demonstrate facile methods for increasing sensitivity of PVDF-HFP/CB film, used in parallel they demonstrate a roadmap for enhancing system cross-selectivity that can be applied to separate units on an array. Fabrication methods, experimental procedures and results are presented and discussed.

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Section: Materials Characterization Results and Discussionsupporting

confidence: 52%

Section: Materials Characterization Results and Discussionmentioning

confidence: 99%

Cross-Selectivity Enhancement of Poly(vinylidene fluoride-hexafluoropropylene)-Based Sensor Arrays for Detecting Acetone and Ethanol

Daneshkhah

Shrestha

Siegel

et al. 2017

Sensors

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“…Compared with the blend films reported in previ ously work [25], the discharge efficiency of this work is lower under same electrical field strength. On the other hand, the XRD results of previous work [25] showed higher relative percent of γ 2b crystal.…”

Section: Dielectric Properties Of Biaxial Oriented P(vdf Hfp)/pmma Blmentioning

confidence: 50%

“…On the other hand, the XRD results of previous work [25] showed higher relative percent of γ 2b crystal. This also suggests that the formation of γ 2b crystal can enhance the increase of discharge efficiency.…”

Section: Dielectric Properties Of Biaxial Oriented P(vdf Hfp)/pmma Blmentioning

confidence: 62%

Structure change and energy storage property of poly(vinylidene fluoride-hexafluoropropylene)/poly (methyl methacrylate) blends

et al. 2015

Self Cite

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In this work, in order to reduce the energy loss induced by the ferroelectric P(VDF HFP) and improve energy storage property, a series of P(VDF HFP)/PMMA blend films were prepared via biaxially oriented technology. The results showed that the ratio of alpha crystal continuously decreased with the addi tion of PMMA, the ratio of beta crystal firstly increased, followed by a reduction with further rising the PMMA percentage. Though gamma ratio was small, it enhances steadily. With the addition of PMMA, it could be found out the disorder in crystal structure, the reduction in crystal size, and the drop in crystallinity of P(VDF HFP). The structure change improved the discharge efficiency and temperature stability. With the addition of PMMA, tanδ is enhanced more than 10°C, and the discharge energy efficiency improved from 45% of pure PVDF to 75% under 400 MV/m after modifying with PMMA. This improvement in the dis charge energy efficiency is thought due to the formation of new crystal γ 2b.

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“…Recently, many researchers have developed inorganic copolymer piezoelectric materials such as poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)], chlorotrifluoroethylene [P(VDF-CTFE)], and hexafluoropropylene [P(VDF-CTFE)], which are excellent candidates of piezoelectric and dielectric 2 of 19 materials for a micro-electro mechanical system [MEMS] [19], microsensor [20], nanogenerator [21], and energy harvesting [22]. But the copolymer is quite expensive [23]. Instead, an aim in this study is to fabricate the PVDF film by means of solution casting method.…”

Section: Introductionmentioning

confidence: 99%

Using Annealing Treatment on Fabrication Ionic Liquid-Based PVDF Films

et al. 2020

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In this study, a simple method to obtain pure β-phase directly from the melt process is proposed. A series of PVDF and ionic liquid (IL) was prepared by a solvent casting method with appropriate associated with the subsequent annealing treatment. IL plays a role of filler, which can create strong electrostatic interaction with PVDF matrix and directly induce β-phase crystallization on the PVDF during the melt. PVDF film sample is immersed in hot water for annealing treatment at different temperatures (25 °C to 70 °C). We found that annealing in high temperatures especially can not only increase more IL inserted into the amorphous region of polymer matrix to make more phase transformation, but also accelerate IL removal. Characteristics and performance of the PVDF films were investigated by use of FTIR, XRD, SEM, and AFM. Piezoelectric coefficient d33 as well as d31, degree of crystallinity, and sensitivity are measured in experiment to verify the performance of PVDF film.

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New crystal structure and discharge efficiency of poly(vinylidene fluoride-hexafluoropropylene)/poly(methyl methacrylate) blend films

Abstract: Most researchers proved that adding PMMA in PVDF can reduce the crystal size of β-phase and improve the discharge efficiency. However, we found that PMMA could facilitate the formation of a new crystal variety (γ-2b), which contributes more to the improvement of discharge efficiency.

Cited by 68 publications

References 19 publications

Cross-Selectivity Enhancement of Poly(vinylidene fluoride-hexafluoropropylene)-Based Sensor Arrays for Detecting Acetone and Ethanol

Cross-Selectivity Enhancement of Poly(vinylidene fluoride-hexafluoropropylene)-Based Sensor Arrays for Detecting Acetone and Ethanol

Structure change and energy storage property of poly(vinylidene fluoride-hexafluoropropylene)/poly (methyl methacrylate) blends

Using Annealing Treatment on Fabrication Ionic Liquid-Based PVDF Films

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