Electrical conductivity and optical properties of a new quaternized polysulfone

Buruiana, Luminita-Ioana; Avram, Ecaterina; Popa, Adriana; Musteata, Valentina-Elena; Ioan, Silvia

doi:10.1007/s00289-011-0659-9

Cited by 18 publications

(9 citation statements)

References 53 publications

(53 reference statements)

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“…The activation energy of the samples calculated from the slope of ln σ dc vs 1000/T graph is shown in figure 2. It shows that, as PVP content increases in the samples, the activation energy decreases, which may be due to the predominance of ionic conduction mechanism caused by PVP in the blend samples, similar results have been reported by Buruiana et al (2012) for polysulfone. The variation of σ ac with frequency at different temperatures for 7:3 PAM/PVP blend sample is shown in figure 3.…”

Section: Resultssupporting

confidence: 83%

Study of electrical properties of polyvinylpyrrolidone/polyacrylamide blend thin films

Rawat¹,

Mahavar²,

Tanwar³

et al. 2014

Bull Mater Sci

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Electrical properties of polyvinylpyrrolidone, polyacrylamide and their blend thin films have been investigated as a function of temperature and frequency. The films were prepared using solution casting method and the measurements on films were carried out at different temperatures ranging from 305 to 345 K covering a frequency range from 10 2 to 10 5 Hz. The conductivity of film samples was found to increase upon increasing the temperature. Lowering of activation energy by increasing the polyvinylpyrrolidone percentage may be due to the predominance of ion conduction mechanism caused by polyvinylpyrrolidone in the blend. The permittivity (ε r ) and dielectric loss (ε i ) were found to decrease upon increasing frequency. Temperature and frequency dependence of impedance, relaxation time and electric modulus of thin film samples have also been studied. From electric modulus formalism, polarization and conduction relaxation behaviour in the film samples have been discussed.

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Section: Resultssupporting

confidence: 83%

Study of electrical properties of polyvinylpyrrolidone/polyacrylamide blend thin films

Rawat¹,

Mahavar²,

Tanwar³

et al. 2014

Bull Mater Sci

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“…The Sa value (2.924 nm) of the MDMO-PPV film is lower than the Sa value (6.99 nm) of the MDMO-PPV thin film in the literature [25]. The Sq value of the MDMO-PPV film is lower than the Sq value (5.16 nm) of the PSFP film [73] in the literature. For a Gaussian distribution of asperity height, statistical theory shows that the ratio of Sq to Sa should be 1.25.…”

Section: Surface Morphology Properties Of the Mdmo-ppv Filmmentioning

confidence: 88%

Optical properties of poly[2-methoxy-5-(3′,7′-dimethyloctyloxy)-1,4-phenylenevinylene] light-emitting polymer solutions: effects of molarities and solvents

Gündüz

2015

Polym. Bull.

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The optical properties of the solutions of the MDMO-PPV light-emitting polymer were investigated. The maximum mass extinction coefficient values of the solutions of the MDMO-PPV for 6.640 and 3.014 µM were found to be 20.874 and 42.009 L g −1 cm −1 , respectively. The absorption band edge values of the solutions of the MDMO-PPV shifted from 2.149 to 1.987 eV with increasing molarity. To obtain lower E g values (2.020, 2.057, 2.083, 2.088 and 2.103 eV, respectively) of the MDMO-PPV can be preferred xylene, toluene, chlorobenzene, chloroform and tetrahydrofuran solvents, respectively. The E g of the solution of the MDMO-PPV was decreased with molarities and solvents. The refractive index values of the MDMO-PPV were controlled with various solvents. The optical parameters such as single oscillator energy, dispersion energy, M −1 , M −3 moments, optical oscillator strengths, linear static refractive index, optical linear susceptibility, third-order nonlinear susceptibility and nonlinear refractive index were calculated using Wemple-DiDomenico equation. The highest contrast was obtained with xylene, while the lowest contrast was obtained with chlorobenzene. The MDMO-PPV can be used in the fabrication of the metal-semiconductor contacts due to low optical band gap and suitable optical parameters. Also, the surface morphology properties of the MDMO-PPV polymer film were investigated.

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“…Other techniques for chemical modification of polysulfones involve exposure to UV radiation, thermolysis, ozonolysis, plasma oxidation and redox activations . For example, carboxylate groups were introduced using three non‐specific carboxylation reactions by UV, heat or redox activation via nitrene or radical species .…”

Section: Chemical Functionalizationmentioning

confidence: 99%