Preparation of polypyrrole nanobowls and their effect for improving direct current dielectric properties of polyethylene

Zhang, Chengcheng; Li, Yafeng; Li, Chunyang; Duan, Sixu; Yang, Jiaming; Han, Baozhong

doi:10.1016/j.polymertesting.2016.07.019

Cited by 10 publications

(3 citation statements)

References 15 publications

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“…1 Polypyrrole (PPy) is a conducting polymer owing to its excellent electrical conductivity, making it interesting to combine PPy with materials having high conductivity and good ferromagnetism. 2 Oxidants become necessary in the chemical polymerization process, and among several oxidants, iron(III) chloride (FeCl 3 ) has been used as an oxidizing agent, 3 revealing that adjusting the FeCl 3 :Py molar ratio can improve the conductivity of PPy. 4 This makes it important to study the effects of the oxidant-to-monomer molar ratio on the physical properties of PPy, including its optical, electrical, and magnetic properties, and their uses in gas sensing applications of PPy.…”

Section: Introductionmentioning

confidence: 99%

Morphological, Magnetic, Optical, Surface Potential, and H2S Gas Sensing Behavior of Polypyrrole Nanofibers

Hasan

Bakr

Ibrahim

2021

Journal of Elec Materi

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The effect of the oxidant-to-monomer (O/M) molar ratio on the morphological, magnetic, optical, and surface potential performance of polypyrrole nanofibers (PPy NFs) has been studied. The PPy NFs were prepared by chemical polymerization of pyrrole at 5°C, then the structure of nanofibers with various diameters was determined by field-emission scanning electron microscopy (FESEM). X-ray diffraction analysis and energy-dispersive x-ray spectroscopy were used to determine the composition of the PPy NFs in the prepared nanostructures. The magnetic hysteresis loop of PPy NFs showed soft ferromagnetic behavior. The surface potential of the PPy NFs was measured by Kelvin probe force microscopy, revealing that the sample with a MO:Py:FeCl 3 molar ratio equal to 1: 5.6: 4 showed excellent surface potential behavior. The H 2 S gas sensing performance of the PPy NFs thin films with each molar ratio was also tested, revealing an enhancement with increasing oxidant concentration.

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Section: Introductionmentioning

confidence: 99%

Morphological, Magnetic, Optical, Surface Potential, and H2S Gas Sensing Behavior of Polypyrrole Nanofibers

Hasan

Bakr

Ibrahim

2021

Journal of Elec Materi

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“…A higher doping concentration will lead to more agglomeration of nanoparticles within the nanocomposite, thus increasing internal defects and pores. In the process of thermal aging, it is more likely to generate weaknesses that lead to material breakdown under high electric field [31]. Figure 5 showed the dielectric constant and dielectric loss curve of pure LDPE under different aging cycles.…”

Section: Resultsmentioning

confidence: 99%

Study on the Structure and Dielectric Properties of Zeolite/LDPE Nanocomposite under Thermal Aging

et al. 2020

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Nanodoping is an effective way to improve the dielectric properties and the aging resistance of polyethylene. Nano-zeolite has a nano-level porous structure and larger specific surface area than ordinary nano-inorganic oxide, which can be used to improve dielectric properties of low-density polyethylene (LDPE) nanocomposite. The zeolite/LDPE nanocomposites were prepared and subjected to thermal aging treatment to obtain samples with different aging time. Using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and the differential scanning calorimetry (DSC) test to study the microscopic and structure characteristics, it was found that nano-zeolite doping can effectively reduce the thermal aging damage to the internal structure of the nanocomposite; carbonyl and hydroxyl decreased significantly during the thermal aging time, and the crystallinity effectively improved. Nano-zeolite doping significantly improved the morphology and strengthened the aging resistance of the nanocomposite. In the dielectric strength test, it was found that nanodoping can effectively improve the direct current (DC) and alternating current (AC) breakdown field strength and the stability after the thermal aging. The dielectric constant of nanocomposite can be reduced, and the dielectric loss had no obvious change during the aging process. Moreover, the zeolite/LDPE nanocomposite with the doping concentration of 1 wt % had the best performance, for the nano-zeolite was better dispersed.

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“…Accordingly, it may be possible to use PE thin film in micro and nano-size energy storage systems. [13], polar alüminyum trihidrat moleküllerinin düşük yoğunluklu polietilenin dielektrik özelliklerine etkisinin incelendiği [14], ışımaya maruz kalmış yüksek yoğunluklu polietilendeki moleküler rölaksasyonlara etkisinin incelendiği [15], kablolarda yalıtıcı olarak kullanılan çapraz bağlı polietilendeki dipolar rölaksasyonların incelendiği [16], düşük yoğunluklu polietilende α-rölaksasyonuna nemin etkilerinin incelendiği [17], yapay morötesi ışımaya maruz bırakılmış düşük yoğunluklu polietilenin dielektrik özelliklerinin incelendiği [18], karbon katkılı polietilen kompozitlerin dielektrik özelliklerinin incelendiği [19], yüksek elektrik alan etkisi altındaki düşük youğunluklu polietilenin dielektrik kayıp faktörünün incelendiği [20], düşük yoğunluklu polietilennin dielektrik özelliklerine asit uygulamalarının etkilerinin incelendiği [21], boron nitrat katkılı polietilen nanokompozitlerin güçlendirilmiş dielektrik özelliklerinin incelendiği [22], nanosilika katkılı düşük yoğunluklu polietilen kompozitlerin dielektrik özelliklerinin incelendiği [23], reaktif plazma polimerizasyon ile üretilmiş azot içeren plazma polietilenin dielektrik ve optik özelliklerinin incelendiği [24], grafit katkılı çok tabakalı polietilen kompozitlerin mekanik, dielektrik ve kristal özelliklerinin incelendiği [25], polipirol katkılı polietilenin DC iletkenlik özelliklerinin incelendiği [26] çalışmalar literatürden bilinmektedir. Bu çalışmalardan, ZnO partiküllerinin eklenmesi ile üretilmiş külçe boyutlarındaki polietilen nanokompozitlerin dielektrik özelliklerinin incelendiği [1], Si/SiO 2 katkılanmış külçe boyutlarında polietilen kompozitlerin dielektriksel, yapısal ve termal özelliklerinin incelendiği [3] ve Fe3O4 katkılanmış yüksek yoğunluklu polietilen nanokompozitlerin termal ve dielektrik özeliklerinin incelendiği [5] çalışmalarda külçe halindeki PE'nin yaklaşık 10 5 Hz de sahip olduğu dielektrik sabitin yaklaşık 2 olarak elde edilmiştir.…”

Section: ö N E ç I K a N L A R unclassified

Polietilen ince filmin dielektrik özelliklerinin frekans, sıcaklığa bağlı davranışı ve camsı geçiş sıcaklığının tespiti

Yakut

2021

Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi

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 Determination of glass transition temperature by VFT model  Higher dielectric constant of PE thin film compared to dielectric constant of bulk PE  Determining glass transition temperature of PE thin film at higher temperatures than glass transition temperature of bulk PE Figure A. The dependence of the frequency value at which the maximum dielectric loss is observed from the dielectric loss obtained from the dielectric loss graph for 35000 g/mol and 750 nm thick polyethylene (PE) thin film (red dots and VFT fit curve) and the temperature dependence of the frequency values at which the maximum electric modulus is observed from the electric modulus graph (blue dots and activation curve) Purpose:The aim of this article is to analyze dielectric properties and glass transition temperature of PE thin film in comparison to bulk PE in order to evaluate the possible application opportunities of PE thin film in enery storage systems. Theory and Methods: PE thin film samples were deposited by thermal evaporation method between Al thin film electrodes under 10-5 Torr vacuum conditions. The dielectric spectroscopy measurements were operated by high frequency empedance analyzer. Results: The results show that thermal evaporation process causes breakage of PE main chain and occurance of oligomers and radicals. These oligomers and radicals may be the reason of increasing dielectric constant as a result of space-charge polarization. Also, the oligomers and radicals may react with each other and the main chain and cause the construction of cross-linked network. The presence of this network is the reason of increasing glass transition temperature. Conclusion: The results obtained for the change of dielectric constant and glass transition temperature show that PE thin films can be thought as candidate for organic energy storage systems.

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Preparation of polypyrrole nanobowls and their effect for improving direct current dielectric properties of polyethylene

Cited by 10 publications

References 15 publications

Morphological, Magnetic, Optical, Surface Potential, and H2S Gas Sensing Behavior of Polypyrrole Nanofibers

Morphological, Magnetic, Optical, Surface Potential, and H2S Gas Sensing Behavior of Polypyrrole Nanofibers

Study on the Structure and Dielectric Properties of Zeolite/LDPE Nanocomposite under Thermal Aging

Polietilen ince filmin dielektrik özelliklerinin frekans, sıcaklığa bağlı davranışı ve camsı geçiş sıcaklığının tespiti

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