Aromatic Polythiourea Dielectrics with Ultrahigh Breakdown Field Strength, Low Dielectric Loss, and High Electric Energy Density

Wu, Shan; Li, Weiping; Lin, Minren; Burlingame, Quinn; Chen, Qin; Payzant, E. Andrew; Xiao, Kai; Zhang, Q. M.

doi:10.1002/adma.201204072

Cited by 309 publications

(230 citation statements)

References 22 publications

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“…On the other hand, many studies show the higher breakdown strength is related to the lower dielectric loss. 10,11 So, the efforts to improve the overall dielectric performance of these materials are devoted to maximizing the dielectric constant and suppress the loss.…”

Section: Introductionmentioning

confidence: 99%

The influence of self-assembly behavior of nanoparticles on the dielectric polymer composites

Lu¹,

Li²,

Wang³

et al. 2013

AIP Advances

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To clearify the influence of the distribution of the conductive nanoparticles on the dielectric properties of the corresponding polymer composites, the microstructure and dielectric character of the composites based on the oleic acid modified ferroferric oxide and polyvinylidene fluoride (PVDF) polymer have been studied experimentally. It is found that these composites exhibit a normal percolative phase transition over the filler content from insulator to conductor, consistent with the classical percolation theory. However, when the percentage of fillers is at a certain value which is below the percolation threshold, these nanoparticles can assemble into a special porous structure in the PVDF matrix, associated with the enhancement of dielectric constant at low frequency. In addition, the controllable dispersion of conducting nanoparticles in a polymer matrix can prevent premature agglomeration at low filling fractions and avoid the appearance of anomalously early percolation. Therefore, the self-assembly behavior of nanoparticles can be beneficial to preparation of the high dielectric constant and low loss composites for the application of electric energy storage.

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Section: Introductionmentioning

confidence: 99%

The influence of self-assembly behavior of nanoparticles on the dielectric polymer composites

Lu¹,

Li²,

Wang³

et al. 2013

AIP Advances

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“…A selected assortment of these promising polymers (especially those with prior evidence of synthesis success) are listed in Table 1 in decreasing order of total dielectric constant. Interestingly, none of these specific polymers have been considered in the past for dielectric applications, although a few other polymers in the general classes listed in Table 1 (for example, polythiourea 6 ) have been shown to hold promise for dielectric applications.…”

Section: Resultsmentioning

confidence: 99%

“…They have found applications in the areas of capacitive energy storage [1][2][3][4][5][6] , transistors [7][8][9] , photovoltaic devices [10][11][12] and electrical insulation 13,14 . The selection and design of a polymer depends on the requirements specific to the application, which, in the case of dielectric applications, can be stated in terms of a subset of the following properties: dielectric constant, band gap, dielectric breakdown field, dielectric loss, morphology, glass transition temperature, mechanical strength, cost and so on.…”

mentioning

confidence: 99%

Rational design of all organic polymer dielectrics

et al. 2014

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To date, trial and error strategies guided by intuition have dominated the identification of materials suitable for a specific application. We are entering a data-rich, modelling-driven era where such Edisonian approaches are gradually being replaced by rational strategies, which couple predictions from advanced computational screening with targeted experimental synthesis and validation. Here, consistent with this emerging paradigm, we propose a strategy of hierarchical modelling with successive downselection stages to accelerate the identification of polymer dielectrics that have the potential to surpass 'standard' materials for a given application. Successful synthesis and testing of some of the most promising identified polymers and the measured attractive dielectric properties (which are in quantitative agreement with predictions) strongly supports the proposed approach to material selection.

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“…However, the PVDF-based systems are not suitable for working temperatures higher than 150 , and they exhibit unacceptably high losses due to remanent polarization. Recently, an alternative route to high performance dielectric polymers was discovered [12][13][14]: the aromatic polyurea/polythiourea family of polymers have permittivities of 4.2-5.6 in broad temperature and frequency ranges, and they have significantly lower losses at high field than BOPP. Polyureas have already been widely used in industry, in applications focusing on their great elasticity and strength.…”

Section: Introductionmentioning

confidence: 99%

Atomistic simulations of aromatic polyurea and polyamide for capacitive energy storage

et al. 2015

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Materials for capacitive energy storage with high energy density and low loss are desired in many fields. We investigate several polymers with urea and amide functional groups using density functional theory and classical molecular dynamics simulations. For aromatic polyurea (APU) and para-aramid (PA), we find several nearly energetically-degenerate ordered structures, while meta-aromatic polyurea (mAPU) tends to be rotationally disordered along the polymer chains. Simulated annealing of APU and PA structures result in the formation of hydrogenbonded sheets, highlighting the importance of dipole-dipole interactions. In contrast, hydrogen bonding does not play a significant role in mAPU, hence the propensity to disorder. We find that the disordered structures with misaligned chains have significantly larger dielectric constants, due to significant increase in the free volume, which leads to easier reorientation of dipolar groups in the presence of an electric field. Large segment motion is still not allowed below the glass transition temperature, which explains the experimentally observed very low loss at high field and elevated temperature. However, the degree of disorder needs to be controlled, because highly entangled structures diminish the free dipoles and decrease permittivity. Among the considered materials, mAPU is the most promising dielectric for capacitive energy storage, but the concept of increasing permittivity while maintaining low loss through disorder-induced free volume increase is generally applicable and provides a new pathway for the design of highperformance dielectrics for capacitive energy storage.

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Aromatic Polythiourea Dielectrics with Ultrahigh Breakdown Field Strength, Low Dielectric Loss, and High Electric Energy Density

Cited by 309 publications

References 22 publications

The influence of self-assembly behavior of nanoparticles on the dielectric polymer composites

The influence of self-assembly behavior of nanoparticles on the dielectric polymer composites

Rational design of all organic polymer dielectrics

Atomistic simulations of aromatic polyurea and polyamide for capacitive energy storage

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