کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5432833 1508908 2017 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structural and dielectric properties of (PEO-PMMA)-SnO2 nanocomposites
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد بیومتریال
پیش نمایش صفحه اول مقاله
Structural and dielectric properties of (PEO-PMMA)-SnO2 nanocomposites
چکیده انگلیسی


- (PEO-PMMA)-SnO2 polymer nanocomposite films have been prepared.
- Dielectric permittivity non-linearly enhances as SnO2 contents increases in films.
- Polymers chain segmental dynamics become much faster at 1 wt% SnO2 concentration.
- Dielectric relaxation and conductivity of these PNCs obey the Arrhenius behaviour.
- These PNC materials are suitable for low-permittivity polymeric nanodielectrics.

Polymer nanocomposite (PNC) films based on poly(ethylene oxide) (PEO) and poly(methyl methacrylate) (PMMA) blend as host polymer matrix dispersed with tin dioxide (SnO2) nanoparticles have been prepared by the solution-cast method. X-ray diffraction measurements confirm that these films are semicrystalline and the degree of crystalline phase reduces with increase of SnO2 contents in the polymer blend. The scanning electron microscopy reveals that the surface morphology of the PNC films is smooth with homogeneous distribution of the SnO2 particles. Complex dielectric permittivity, electrical conductivity, electric modulus and impedance spectra of the PNC films have been investigated in the frequency range from 20 Hz to 1 MHz. The real part of the dielectric permittivity of these films has non-linear increase with the increase of SnO2 nanoparticles contents in the PEO-PMMA blend over the audio frequency range, whereas it is found tunable with nanofiller concentration in the range from 2 to 3 at the radio frequencies. Dielectric loss tangent and the loss part of electric modulus spectra exhibit relaxation peaks which are ascribed to cooperative chain segmental dynamics of the PEO and PMMA macromolecules. It is observed that the polymers chain segmental dynamics becomes much faster when only 1 wt% SnO2 nanoparticles are dispersed in the polymer blend matrix, which further enhances moderately with the increase of SnO2 concentration up to 5 wt%. The dielectric relaxation time and electrical conductivity values of the PNC film are found Arrhenius in temperature of activation energies 0.15 eV and 0.43 eV, respectively.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Composites Communications - Volume 5, September 2017, Pages 54-63
نویسندگان
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