Low temperature internal friction on γ-irradiated polyvinylidene fluoride (PVDF)

A. Callens; L. Eersels; R. De Batist

doi:10.1007/BF00552895

Low temperature internal friction on γ-irradiated polyvinylidene fluoride (PVDF)

A. Callens, L. Eersels, R. De Batist

Research output › peer-review

Abstract

A least-squares fitting of the below room temperature part of the internal friction spectra, obtained by the torsion pendulum technique on as-received and γ-irradiated (up to 1 Grad) strips and fibres of polyvinylidene fluoride [-(CH₂-CF₂-)_n-⋯.; PVDF] by a superposition of single Debye functions, reveals that the spectral component features are determined not only by purely amorphous chain characteristics but also by the dosedependence of crystallinity. A careful analysis of the relaxation spectra confirms that at least one relaxation effect (∼236 K) is created upon irradiation. The analysis of the dose dependence of the characteristics of the β (glass transition; ∼ 220 K) and β_u (apparent upper glass transition; ∼270 K) relaxations, suggests the probable influence of crystallinity on the molecular motion in the amorphous phase. The increase of the intensity of the γ relaxation (∼190 K) is related to the irradiation-induced crystallite degradation.

Original language	English
Pages (from-to)	1887-1900
Number of pages	14
Journal	Journal of Materials Science
Volume	13
Issue number	9
DOIs	https://doi.org/10.1007/BF00552895
State	Published - Sep 1978

ASJC Scopus subject areas

Ceramics and Composites
Materials Science (miscellaneous)
General Materials Science
Mechanics of Materials
Mechanical Engineering
Polymers and Plastics

Access to Document

10.1007/BF00552895

Cite this

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title = "Low temperature internal friction on γ-irradiated polyvinylidene fluoride (PVDF)",

abstract = "A least-squares fitting of the below room temperature part of the internal friction spectra, obtained by the torsion pendulum technique on as-received and γ-irradiated (up to 1 Grad) strips and fibres of polyvinylidene fluoride [-(CH2-CF2-)n-⋯.; PVDF] by a superposition of single Debye functions, reveals that the spectral component features are determined not only by purely amorphous chain characteristics but also by the dosedependence of crystallinity. A careful analysis of the relaxation spectra confirms that at least one relaxation effect (∼236 K) is created upon irradiation. The analysis of the dose dependence of the characteristics of the β (glass transition; ∼ 220 K) and βu (apparent upper glass transition; ∼270 K) relaxations, suggests the probable influence of crystallinity on the molecular motion in the amorphous phase. The increase of the intensity of the γ relaxation (∼190 K) is related to the irradiation-induced crystallite degradation.",

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year = "1978",

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T1 - Low temperature internal friction on γ-irradiated polyvinylidene fluoride (PVDF)

AU - Callens, A.

AU - Eersels, L.

AU - De Batist, R.

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Y1 - 1978/9

N2 - A least-squares fitting of the below room temperature part of the internal friction spectra, obtained by the torsion pendulum technique on as-received and γ-irradiated (up to 1 Grad) strips and fibres of polyvinylidene fluoride [-(CH2-CF2-)n-⋯.; PVDF] by a superposition of single Debye functions, reveals that the spectral component features are determined not only by purely amorphous chain characteristics but also by the dosedependence of crystallinity. A careful analysis of the relaxation spectra confirms that at least one relaxation effect (∼236 K) is created upon irradiation. The analysis of the dose dependence of the characteristics of the β (glass transition; ∼ 220 K) and βu (apparent upper glass transition; ∼270 K) relaxations, suggests the probable influence of crystallinity on the molecular motion in the amorphous phase. The increase of the intensity of the γ relaxation (∼190 K) is related to the irradiation-induced crystallite degradation.

AB - A least-squares fitting of the below room temperature part of the internal friction spectra, obtained by the torsion pendulum technique on as-received and γ-irradiated (up to 1 Grad) strips and fibres of polyvinylidene fluoride [-(CH2-CF2-)n-⋯.; PVDF] by a superposition of single Debye functions, reveals that the spectral component features are determined not only by purely amorphous chain characteristics but also by the dosedependence of crystallinity. A careful analysis of the relaxation spectra confirms that at least one relaxation effect (∼236 K) is created upon irradiation. The analysis of the dose dependence of the characteristics of the β (glass transition; ∼ 220 K) and βu (apparent upper glass transition; ∼270 K) relaxations, suggests the probable influence of crystallinity on the molecular motion in the amorphous phase. The increase of the intensity of the γ relaxation (∼190 K) is related to the irradiation-induced crystallite degradation.

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