Dielectric Relaxation Studies of Bisphenol A-Diphenyl Carbonate/Lexan Polycarbonate Solid Solutions

Pochan, J. M.; Gibson, Harry W.; Froix, Michael F.; Hinman, D. F.

doi:10.1021/ma60061a029

Cited by 41 publications

(24 citation statements)

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“…Since the main dipolar group in BPA-PC is the carbonyl one, this assignment would justify the marked asymmetry of the dielectric c-relaxation, presenting the loss maximum in the high frequency side. The identification of the isolated component with the motions of the carbonyl group would also be supported by the comparison of the activation energy value obtained (29.5 kJ mol À1 ) with those reported in the literature [7,9,11] for the processes assigned to the carbonyl motion (around 30 kJ mol À1 ) and with that obtained from calculations on analogous of polycarbonates (36 kJ mol À1 ) [12]. Nevertheless, other molecular mechanism could be responsible for such relaxation component.…”

Section: Discussionsupporting

confidence: 72%

“…As commented in the introduction, there is not a consensus about the molecular motions responsible of the secondary relaxation of BPA-PC. Nevertheless, several studies have suggested that the fast part of the c-relaxation of BPA-PC is associated with the motion of the carbonyl group alone [9,11]. Since the main dipolar group in BPA-PC is the carbonyl one, this assignment would justify the marked asymmetry of the dielectric c-relaxation, presenting the loss maximum in the high frequency side.…”

Section: Discussionmentioning

confidence: 99%

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Effect of cold-drawing on the secondary dielectric relaxation of bisphenol-A polycarbonate

Mitxelena¹,

Colmenero²,

Alegría³

2005

Journal of Non-Crystalline Solids

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Section: Discussionsupporting

confidence: 72%

Section: Discussionmentioning

confidence: 99%

Effect of cold-drawing on the secondary dielectric relaxation of bisphenol-A polycarbonate

Mitxelena¹,

Colmenero²,

Alegría³

2005

Journal of Non-Crystalline Solids

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“…The values of activation energies for PC and BEDO-TTF/PC films were found to be 813 kJ/mol and 785 kJ/mol, respectively. These values for PC are in the range of values of 480 and 835 kJ/mol as reported in the literature [45,55,72]. WLF behavior for PC had been previously reported by others [39,[73][74][75][76][77][78].…”

Section: Dielectric Analysissupporting

confidence: 78%

Processing and Performance of Polymeric Transparent Conductive Composites

Jain

Muralidharan

Sedloff

et al. 2013

International Journal of Polymer Science

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Recent advances in microelectronic and optoelectronic industries have spurred interest in the development of reticulate doped polymer films containing "metallic" charge transfer complexes. In this study, such reticulate doped polymer films were prepared by exposing solid solutions of bis(ethylenedioxy) tetrathiafulvalene (BEDO-TTF) in polycarbonate (PC) to iodine, forming conductive charge transfer complexes. The resulting films exhibited room temperature conductivities ranging from 6.33 to 90.4×10 −5 S ⋅ cm −1. The colored iodine complexes in the film were reduced by cyclic voltammetry yielding conductive, colorless, transparent films. We were intrigued to examine the dielectric properties of BEDO-TTF in solid solution in PC prior to formation of the charge transfer complex as no such studies appear in the literature. Dielectric analysis (DEA) was used to probe relaxations in neat PC and BEDO-TTF/PC. BEDO-TTF plasticized the PC and decreased the glass transition temperature. Two secondary relaxations appeared in PC films, whereas the transitions merged in the BEDO-TTF/PC film. DEA also evidenced conductivity relaxations above 180 ∘ C which are characterized via electric modulus formalism and revealed that BEDO-TTF increased AC conductivity in PC.

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“…The molecular motions can usually be calculated by means of dielectric relaxation, nuclear magnetic resonance (NMR) spectroscopy, dynamic mechanical analysis (DMA), differential scanning calorimetry (DSC) etc. [3][4][5][6] In addition to these measurements, theoretical calculations and computer simulations may be used to assist in the identification of the possible molecular motions. [7 -20] Boyd et al, [7][8][9] for example, have investigated the glass transition temperatures of polyethylene, polyisobutylene, etc., by MD simulations, and Sung et al [10,11] have explored the rotations of phenylene rings and segmental motions.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulation of Sub-Transition for Polyethersulfone

Shi¹,

Jiang

et al. 2001

Macromol. Theory Simul.

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Molecular dynamics (MD) simulations of a polyethersulfone (PES) chain are carried out in the amorphous state by using the Dreiding 2.21 force field at four temperatures. Two types of molecular motion, i.e. rotations of phenylene rings and torsions of large segments containing two oxygen atoms, two sulfur atoms, and five phenylene rings on the backbone, are simulated. The modeling results show that the successive phenylene rings should be in‐phase cooperative rotations, whereas the successive large segments should be out‐of‐phase cooperative torsions. By calculating the diffusion coefficient for the phenylene ring rotations, it is found that this rotation contributes to the β‐transition of PES.

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Dielectric Relaxation Studies of Bisphenol A-Diphenyl Carbonate/Lexan Polycarbonate Solid Solutions

Cited by 41 publications

References 0 publications

Effect of cold-drawing on the secondary dielectric relaxation of bisphenol-A polycarbonate

Effect of cold-drawing on the secondary dielectric relaxation of bisphenol-A polycarbonate

Processing and Performance of Polymeric Transparent Conductive Composites

Molecular Dynamics Simulation of Sub-Transition for Polyethersulfone

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