Cross-linking effect on dielectric properties of polypropylene thin films and applications in electric energy storage

Yuan, Xuepei; Chung, T. C.

doi:10.1063/1.3552710

Cited by 89 publications

(67 citation statements)

References 25 publications

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“…The acceleration voltage was 20 kV in a low vacuum mode of 1-270 Pa. Figure 1 shows the XRD pattern of PP/PVDF blends. The diffraction peaks of pure PVDF are at 2θ = 18.3 • , 19.9 • , and 26.5 • , respectively, while that of PP are at 2θ = 14 • , 19.9 • , and 18.5 • , respectively [8,17]. It can be seen from Figure 1 that the diffraction peaks of PP and PVDF coexist after their blending.…”

Section: Instrumental Analysismentioning

confidence: 67%

“…The orientation speed of polarity groups of PVDF was less than the variations of electric field, which led to a steep fall of the ε curve. Although the dielectric constant ranges of PP and PVDF are 2.2-3 and 8.4-13.5, respectively, PP/PVDF blends have poor dielectric properties, as their dielectric constant has a maximum value of 3, which is lower than that of pure PVDF [16,17]. Figure 5b shows the relationship of ε of PP/SMA/PVDF blends to frequency.…”

Section: Dielectric Propertiesmentioning

confidence: 99%

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Study of the Preparation and Dielectric Property of PP/SMA/PVDF Blend Material

Chen

Pei

2017

Applied Sciences

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Polypropylene (PP) and polyvinylidene fluoride (PVDF) polymer materials have been widely used because PP has excellent piezoelectricity and PVDF has a robust tensile strength. However, few studies have been reported about PP/PVDF blends, and the main issue has proven to be the interfacial compatibility of blends. This research investigated the microstructure of blends to characterize their compatibility. X-ray diffraction (XRD) and scanning electron microscope (SEM) analysis showed the poor interactions between PP and PVDF interface, and thus this study adopted styrene maleic anhydride (SMA) copolymer as compatibilizer to modify the properties of blends. The XRD and SEM investigations showed an enhancement in the interactions between PP and PVDF after the addition of SMA. The dielectric properties of PP/SMA/PVDF blends showed a significant increase when PP content was 40%-60% and the dielectric constant (ε) was up to 13; meanwhile, the dielectric loss (tanδ) of PP/SMA/PVDF was lower than PP/PVDF blends.

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Section: Instrumental Analysismentioning

confidence: 67%

Section: Dielectric Propertiesmentioning

confidence: 99%

Study of the Preparation and Dielectric Property of PP/SMA/PVDF Blend Material

Chen

Pei

2017

Applied Sciences

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“…This self cross‐linking process (without external reagent) not only results in an effective 3D network structure but also prepares the resulting x‐PP products with high purity (free of contaminant). For many electric applications, such as PP film capacitors, the clean x‐PP film is essential to achieving high breakdown strength and low energy loss …”

Section: Functionalization Of Polypropylene Using “Reactive” Comonomersmentioning

confidence: 99%

Functionalization of Polypropylene by the Combination of Metallocene Catalysts and Reactive Comonomers

Chung

2013

Macro Reaction Engineering

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This paper summarizes a functionalization approach that can prepare functional PP with desirable molecular structures, including functional groups, microstructures, high molecular weight, and narrow molecular weight and composition distributions. A newly‐developed catalysis technology with several designed “reactive” comonomers to circumvent the inevitable deactivation of the transition metal cationic active site by functional groups in the direct polymerization process has been applied. The reactive comonomers, containing organoborane, benzylic protons (ϕ‐CH3), and styrene moieties exhibit three essential properties, including (a) stability with the active site, (b) solubility in the polymerization media, and (c) versatility for interconversion to desirable functional groups under mild reaction conditions. With proper choice of metallocene catalysts, they resemble to high a‐olefin monomers and can be effectively incorporated into the PP structure. In addition to the interconversion of the incorporated reactive sites to the desirable functional groups in PP copolymers, some reactive sites have been also transformed into “living” radical or anionic initiators to initiate graft‐from polymerization of polar monomers to obtain PP graft copolymers.

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“…Polypropylene (PP) films which show high breakdown strength and low dielectric loss and fast charge–discharge capability have been widely used in micro‐electronic devices and electric power system as energy storage units. However, the nonpolar molecular structure of PP with only a few electron polarizations contribution results in the low dielectric constant . For example, the bi‐axially oriented polypropylene (BOPP) could only reach an energy storage density of about 4 J cm −3 at electric field 600 MV m −1 due to the quite low ɛ r of about 2.…”

Section: Introductionmentioning

confidence: 99%

Enhanced dielectric performances of polypropylene films via polarity adjustment by maleic anhydride‐grafted polypropylene

Chen

Wang

et al. 2017

J of Applied Polymer Sci

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Maleic anhydride‐grafted polypropylene (MA‐g‐PP) was hybridized with pure PP to form hybrid films with the aim to enhance the dielectric performances of the PP film via polarity adjustment. The changes of microstructure and crystallinity of PP matrix by MA‐g‐PP incorporation were studied, and the polarity change was identified by the surface wettability. The dielectric behaviors of the hybrid films were explored. Increasing polarity of PP film leads to increase in dielectric constant but decrease in breakdown strength, and a balance is achieved in 10 vol % MA‐g‐PP/PP hybrid film, with the maximum discharge energy density reaching 1.96 J cm−3 and charge–discharge efficiency as high as 96%. The ultralow loss is attributed to the dense and homogeneous microstructure together with increased crystallinity induced by incorporation of MA‐g‐PP. These PP‐based films with increased polarity not only show enhanced dielectric performances but also provide a type of matrix that would be compatible with polar fillers to further increase dielectric properties. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45029.

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Cross-linking effect on dielectric properties of polypropylene thin films and applications in electric energy storage

Cited by 89 publications

References 25 publications

Study of the Preparation and Dielectric Property of PP/SMA/PVDF Blend Material

Study of the Preparation and Dielectric Property of PP/SMA/PVDF Blend Material

Functionalization of Polypropylene by the Combination of Metallocene Catalysts and Reactive Comonomers

Enhanced dielectric performances of polypropylene films via polarity adjustment by maleic anhydride‐grafted polypropylene

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