Dielectric studies of specific interaction and molecular motion in single-phase mixture of poly(methyl methacrylate) and poly(vinylidene fluoride)

Aihara, Takaaki; Saito, Hiromu; Inoue, Takashi; Wolff, Hans-Peter; Stühn, Bernd

doi:10.1016/s0032-3861(97)00237-1

Cited by 30 publications

(20 citation statements)

References 23 publications

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“…The dielectric behavior of pure PMMA has been received much attention recently [19][20][21][22][23][24] and the studied published before 1967 have been reviewed. 25 The aim here is not a comprehensive study of the dielectric response of PMMA but merely the identification of major relaxations in the sample that would help us understand its behavior in the blend.…”

Section: Pure Pmmamentioning

confidence: 99%

“…The behavior of pure PMMA (Figures 1, 2) is in good agreement with the literature studies, however, most of the published data for the dielectric behavior of pure PMMA observed αβ-process merged together. [19][20][21][22][23][24] The ability to resolve these two relaxation process is strong function of the frequency and temperature. In the current case, the measurements in Figures 2 were carried out over 10 −1 -10 6 Hz and 5 • C increment in the temperature, therefore, for example, at 96 • C one can clearly observe two resolved α and β-relaxation processes at low and high frequencies, respectively.…”

Section: Pure Pmmamentioning

confidence: 99%

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Broadband Dielectric Spectroscopy for Poly(methyl methacrylate)/Poly(α-methyl styrene-co-acrylonitrile) Blend

Madbouly

2002

Polym J

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ABSTRACT:Blends of poly(methyl methacrylate), PMMA, and Poly(α-methyl styrene-co-acrylonitrile), PαMSAN, random copolymer have been studied by broadband dielectric relaxation spectroscopy and differential scanning calorimeter (DSC). The dielectric measurements were carried out over a wide range of frequency (10 −1 to 10 6 Hz) and temperature (30-155• C). The molecular dynamics of the glass relaxation process, α-process, was investigated as functions of composition, frequency and temperature. It has been found that, only one common α-relaxation process has been observed for all measured samples, its dynamics and broadness were found to be composition dependent. The existence of only one common α-relaxation process located at a temperature range between those of the pure polymer components was taking as a strong evidence for the miscibility of the blend over the entire range of composition. The miscibility was also confirmed by measuring the glass transition temperatures of the blends, T g s, calorimetrically using DSC and dielectrically from the activation curves of the α-relaxation processes of the blends. The T g s of the blends were found to follow Fox-equation. The composition dependence of the dielectric relaxation strength, ∆ε has been also examined for α and β-relaxation processes. In addition, the blending was found to have no effect on the kinetics and broadness of the β-relaxation processes of the PMMA, indicating that blending does not change the local environment of each component in the blend. This also led to in turn that the mixing of the two polymer components should take place on a structure level bigger than the segmental level to keep the local environment unchanged and small enough to have the same volume as the cooperative dipoles, which are related to the single T g of the miscible blend. KEY WORDS Poly(methyl methacrylate)/Poly(α-methyl styrene-co-acrylonitrile) (PMMA/ PαMSAN) / Miscibility / Molecular Dynamics / Physical or chemical combination of two structurally different polymers can be used to obtain materials with properties which differ from those of the constituent components and which can be optimized to meet specific needs, like chemical resistance, impact strength, flexibility or weatherability. The final properties of the blend depend on the properties of the pure polymer components, miscibility and adhesion between the phases as well as the size and uniformity of the phase texture or morphology. Many techniques have been extensively used to investigate the miscibility and molecular dynamics of polymer blends, such as, differential scanning calorimetry (DSC), 1, 2 NMR, 3-6 dielectric spectroscopy, 7-12 and mechanical measurements. [13][14][15][16][17] The dielectric relaxation spectroscopy is a powerful tool cable of providing information about the molecular dynamics and the nature of the interactions in blends by monitoring the motion of dipolar groups attached to molecular chains. The dielectric spectroscopy has been widely used in polymer relaxation analysis and has the advan...

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Section: Pure Pmmamentioning

confidence: 99%

Section: Pure Pmmamentioning

confidence: 99%

Broadband Dielectric Spectroscopy for Poly(methyl methacrylate)/Poly(α-methyl styrene-co-acrylonitrile) Blend

Madbouly

2002

Polym J

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“…In polymer blends, it is well known that motional transitions can provide valuable information as to the phase state and morphology of blends as a function of their composition and previous history [14,15]. One of the objectives of this study is to quantify the effect of electron irradiation on characteristic translation and rotational chain (dipoles) motions associated with the glass-rubber and crystalline relaxation.…”

Section: Introductionmentioning

confidence: 99%

Quantitative analysis of structural, relaxational and electrostrictive properties of PVDF-TRFE/PMMA films irradiated with high-energy electrons

Bharti

Hu²,

Cheng

et al. 2001

IEEE Trans. Dielect. Electr. Insul.

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In this paper, the effect of high-energy electron irradiation on the transitional and electromechanical responses of PVDF-TRFEIPMMA (poly (vinylidene fluoride-trifluoroethy1ene)l polymethylmethacrylate) blend films is investigated in the light of a recent finding of large electrostrictive strain and high electromechanical response of PVDF-TRFE copolymer films after high-energy electron irradiation. Due to the decrease in crystallinity, both the dielectric and polarization responses were found to decrease with PMMA content. Interestingly, the presence of PMMA is found to affect the crystal-amorphous interface properties strongly in irradiated polyblend films. The field-induced strain which could be due to electrostriction and Maxwell stress for a blend system is found to come mainly from electrostriction. At room temperature, the contribution to the total strain from the Maxwell stress is found to be ~2 0 % while this contribution increases markedly with increasing temperature, especially for 7 %wt PMMA polyblend films.

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“…Arrhenius plots for PMMA and PMMA/ PVDF blends depicting changes in curve behavior between ␤ and ␣␤ relaxations are also noted in the literature. 54 Cole-Cole plots (⑀Љ vs ⑀Ј) were constructed for ␤, ␣ D , and ␣␤ processes to evaluate the dielectric strengths. 49,51,55 The dielectric strength, or relaxation strength (⌬⑀), was taken as the difference between the low-frequency, relaxed state (⑀ o ) involving contributions from all dipole orientation processes and the high-frequency, unrelaxed state (⑀ ϱ ), which is void of all dipole orientation contributions due to measurements at high frequencies.…”

Section: Deamentioning

confidence: 99%

“…The values for C 1 , C 2 , and T o were determined from curve fitting of the data to the WLF equation; these were found to be 9.93, 53.20, and 47°C, respectively. The universal constants C 1 and C 2 are reported as 17.4 and 51.6, 53,54,58 respectively. ⌬H values were subsequently calculated according to the following equation: 59…”

Section: Deamentioning

confidence: 99%

Viscoelastic properties and phase behavior of 12‐tert‐butyl ester dendrimer/poly(methyl methacrylate) blends

Emran

Liu

Newkome

et al. 2001

J Polym Sci B Polym Phys

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This study used refractometry, ultraviolet-visible spectroscopy, Fourier transform infrared spectroscopy, differential scanning calorimetry, and dielectric analysis to assess the viscoelastic properties and phase behavior of blends containing 0 -20% (w/w) 12-tert-butyl ester dendrimer in poly(methyl methacrylate) (PMMA). Dendritic blends were miscible up through 12%, exhibiting an intermediate glasstransition temperature (T g ; ␣) between those of the two pure components. Interactions of PMMA CAO groups and dendrimer NOH groups contributed to miscibility. T g decreased with increasing dendrimer content before phase separation. The dendrimer exhibited phase separation at 15%, as revealed by Rayleigh scattering in ultravioletvisible spectra and the emergence of a second T g in dielectric studies. Before phase separation, clear, secondary ␤ relaxations for PMMA were observed at low frequencies via dielectric analysis. Apparent activation energies were obtained through Arrhenius characterization. A merged ␣␤ process for PMMA occurred at higher frequencies and temperatures in the blends. Dielectric data for the phase-separated dendrimer relaxation (␣ D ) in the 20% blend conformed to Williams-Landel-Ferry behavior, which allowed the calculation of the apparent activation energy. The ␣ D relaxation data, analyzed both before and after treatment with the electric modulus, compared well with neat dendrimer data, which confirmed that this relaxation was due to an isolated dendrimer phase.

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Dielectric studies of specific interaction and molecular motion in single-phase mixture of poly(methyl methacrylate) and poly(vinylidene fluoride)

Cited by 30 publications

References 23 publications

Broadband Dielectric Spectroscopy for Poly(methyl methacrylate)/Poly(α-methyl styrene-co-acrylonitrile) Blend

Broadband Dielectric Spectroscopy for Poly(methyl methacrylate)/Poly(α-methyl styrene-co-acrylonitrile) Blend

Quantitative analysis of structural, relaxational and electrostrictive properties of PVDF-TRFE/PMMA films irradiated with high-energy electrons

Viscoelastic properties and phase behavior of 12‐tert‐butyl ester dendrimer/poly(methyl methacrylate) blends

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