Hinglish Cinema

Prateek, .; Sarwal, Amit

doi:10.1057/9781137426505.0018

Cited by 3 publications

(3 citation statements)

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“…Polymeric materials with high values of the dielectric permittivity [1][2][3][4][5][6][7][8] represent an important class of materials, with numerous applications in various fields of research and technology, such as for instance energy storage, sensors, organic electronics, actuators, and so forth. [9][10][11][12][13][14][15][16] Many efforts have been dedicated to enhance dielectric properties of polymeric materials. [16][17][18][19][20][21][22][23][24][25][26] However, low dielectric permittivity of the polymeric materials still poses a challenge.…”

Section: Introductionmentioning

confidence: 99%

Polymer bilayers with enhanced dielectric permittivity and low dielectric losses by Maxwell–Wagner–Sillars interfacial polarization: Characteristic frequencies and scaling laws

Samet

Kallel

Serghei

2019

J of Applied Polymer Sci

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An efficient approach to obtain polymeric materials with high permittivity values and low dielectric losses is presented in the current study. For this purpose, dielectric measurements by means of broadband dielectric spectroscopy, numerical simulations, and analytical calculations have been carried out for bilayer structures consisting in an insulating and a conductive polymer layer. Polyethyleneterephtalate and polytetrafluoroethylene have been used as insulating layers while, as conductive materials, blends of polyvinyl acetate with an ionic liquid, 1‐butyl‐3‐methylimidazolium tetrafluoroborate. The dielectric properties of the samples have been investigated in a broad frequency (from 10−1 to 107 Hz) and temperature range in order to determine, through the analysis of the scaling laws governing the interfacial polarization effects, the characteristic frequency ranges and the amplitude of the enhanced permittivity. An excellent agreement is found between the experimental results, the numerical simulations, and the analytical calculations. Finally, we show that bilayer polymeric materials with permittivity values as high as ε′ = 556 and with low dielectric losses (tan(δ) = 0.001) can be readily obtained by the current approach. This could have multiple applications, especially in the field of organic electronics. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47551.

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Section: Introductionmentioning

confidence: 99%

Polymer bilayers with enhanced dielectric permittivity and low dielectric losses by Maxwell–Wagner–Sillars interfacial polarization: Characteristic frequencies and scaling laws

Samet

Kallel

Serghei

2019

J of Applied Polymer Sci

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“…[3][4][5][6][7] In addition to the resistance to mechanical stress, it provides protection against microbial infection that breaks down polysaccharide into single sugar components. [8][9][10] The conjugated alkene in the cinnamate skeleton also has a pivotal role in UV filter that protects photodegradation of DNA and photosensitive molecules by trans-cis isomerization. 11,12 Such UV absorbing compound has been given attention in cosmetic market to reduce risk of the skin damage when exposed to the sunlight.…”

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical study on the excited-state dynamics of ortho-, meta-, and para-methoxy methylcinnamate

Miyazaki

Yamamoto

Aoki

et al. 2014

The Journal of Chemical Physics

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The S1 state dynamics of methoxy methylcinnamate (MMC) has been investigated under supersonic jet-cooled conditions. The vibrationally resolved S1-S0 absorption spectrum was recorded by laser induced fluorescence and mass-resolved resonant two-photon ionization spectroscopy and separated into conformers by UV-UV hole-burning (UV-UV HB) spectroscopy. The S1 lifetime measurements revealed different dynamics of para-methoxy methylcinnamate from ortho-methoxy methylcinnamate and meta-methoxy methylcinnamate (hereafter, abbreviated as p-, o-, and m-MMCs, respectively). The lifetimes of o-MMC and m-MMC are on the nanosecond time scale and exhibit little tendency of excess energy dependence. On the other hand, p-MMC decays much faster and its lifetime is conformer and excess energy dependent. In addition, the p-MMC-H2O complex was studied to explore the effect of hydration on the S1 state dynamics of p-MMC, and it was found that the hydration significantly accelerates the nonradiative decay. Quantum chemical calculation was employed to search the major decay route from S1(ππ(∗)) for three MMCs and p-MMC-H2O in terms of (i) trans → cis isomerization and (ii) internal conversion to the (1)nπ(∗) state. In o-MMC and m-MMC, the large energy barrier is created for the nonradiative decay along (i) the double-bond twisting coordinate (∼1000 cm(-1)) in S1 as well as (ii) the linear interpolating internal coordinate (∼1000 cm(-1)) from S1 to (1)nπ(∗) states. The calculation on p-MMC decay dynamics suggests that both (i) and (ii) are available due to small energy barrier, i.e., 160 cm(-1) by the double-bond twisting and 390 cm(-1) by the potential energy crossing. The hydration of p-MMC raises the energy barrier of the IC route to the S1/(1)nπ(∗) conical intersection, convincing that the direct isomerization is more likely to occur.

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“…[6][7][8] The state-of-the-art polymer dielectric, biaxially oriented polypropylene (BOPP), shows extremely low dissipation factor (0.0002) and high breakdown strength (700 MV/m). [9][10][11] However, the dissipation factor would increase largely when temperature is above 85 C, and the dielectric constant is expected to be enhanced in further in order to obtain larger maximum energy storage density. 12 Therefore, for the purpose of meeting the requirement of high-temperature capacitors in hostile circumstances, it is of great importance to develop high-temperature resistant polymer dielectrics with superior dielectric properties.…”

Section: Introductionmentioning

confidence: 99%

Revealing the correlation between molecular structure and dielectric properties of carbonyl‐containing polyimide dielectrics

Tong

Ahmad

et al. 2019

J of Applied Polymer Sci

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Polymer dielectrics with outstanding heat resistance and advanced dielectric properties are of great importance for hightemperature capacitors in the applications of hostile circumstances. In this work, a series of aromatic carbonyl-containing polyimides (CPI) are prepared from the carbonyl dianhydride and different diamines. The correlation between molecular structure (i.e., different linked structure ( O , CH2 , SO2 ) in diamines, the length of repeating unit and the linked position (para-para or meta-meta), and properties is revealed in detail to obtain CPI dielectrics with excellent thermal resistance (glass transition temperature, T g : 241~352 C), reasonably high dielectric constant (3.99~5.23), low dissipation factor (0.00307~0.00395), and admirable breakdown strength (425~552 MV/m) simultaneously. Particularly, CPI-5 with carbonyl structure in dianhydride and sulfonyl group in diamine proves to exhibit discharged energy density and charge-discharge efficiency of 6.34 J/cm 3 and 92.3% at 500 MV/m, respectively. In addition, CPI-5 also displays stable dielectric properties in temperature range of −50-200 C.

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Hinglish Cinema

Cited by 3 publications

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Polymer bilayers with enhanced dielectric permittivity and low dielectric losses by Maxwell–Wagner–Sillars interfacial polarization: Characteristic frequencies and scaling laws

Polymer bilayers with enhanced dielectric permittivity and low dielectric losses by Maxwell–Wagner–Sillars interfacial polarization: Characteristic frequencies and scaling laws

Experimental and theoretical study on the excited-state dynamics of ortho-, meta-, and para-methoxy methylcinnamate

Revealing the correlation between molecular structure and dielectric properties of carbonyl‐containing polyimide dielectrics

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