New dynamics in poly(propylene glycol) based glass-forming nanocomposites

Głuszek, M.; Antosik, Agnieszka; Żurowski, Radosław; Szafran, M.; Rzoska, Sylwester J.; Zalewski, Marcin; Pawlikowska, Emilia; Starzonek, Szymon

doi:10.1016/j.jnoncrysol.2017.05.022

Cited by 5 publications

(2 citation statements)

References 35 publications

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“…Most liquids are characterized by 0.7 < S <1 [22]. However, in some liquid crystal's phases the exponent can be even lesser than 0.5 [23,24]. In Ref.…”

Section: The Evolution Of Relaxation Times and The Dynamic Crossovermentioning

confidence: 99%

Unique dynamic crossover in supercooled x,3-dihydroxypropyl acrylate (x = 1, 2) isomers mixture

et al. 2018

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The previtreous dynamics in the glass-forming monomer, glycerol monoacrylate (GMA), was tested using the broadband dielectric spectroscopy (BDS). The measurements revealed a clear dynamic crossover at the temperature [Formula: see text] K and the time scale [Formula: see text] ns for the primary (structural) relaxation time and no hallmarks for the crossover for the DC electric conductivity [Formula: see text]. This result was revealed via the derivative-based and distortions-sensitive analysis [Formula: see text] vs. [Formula: see text] , where [Formula: see text] stands for the apparent activation energy. Subsequent tests of the fractional Debye-Stokes-Einsten relation [Formula: see text] showed that the crossover is associated with [Formula: see text] [Formula: see text] (for [Formula: see text]. The crossover coexists with the emergence of the secondary beta relaxation, which smoothly develops deeply into the solid amorphous phase below the glass temperature [Formula: see text].

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“…Most liquids are characterized by 0.7 < S <1 [22]. However, in some liquid crystal's phases the exponent can be even lesser than 0.5 [23,24]. In Ref.…”

Section: The Evolution Of Relaxation Times and The Dynamic Crossovermentioning

confidence: 99%

Unique dynamic crossover in supercooled x,3-dihydroxypropyl acrylate (x = 1, 2) isomers mixture

et al. 2018

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“…Consequently, focused studies beyond dominant paths can have a milestone meaning for approaching the ultimate insight into this a e-mail: szymon.starzonek@wp.pl puzzling topic. A possible milestone direction can offer studies in 'innovative' glass forming systems, such as composite materials benefiting from the combination of a polymeric glass matrix and solid nano-or microparticle [5][6][7][8][9][10][11][12][13][14][15][16]. This can lead to qualitatively new glassy metamaterial features, results for the added value combination of constituents' properties [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Polyvinylidene difluoride-based composite: glassy dynamics and pretransitional behaviour

et al. 2020

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This paper presents results of broadband dielectric spectroscopy studies in the composite system for which particularly strong interactions between polyvinylidene difluoride (PVDF: ferroelectric polymer, TC = 453−473 K) matrix and barium strontium titanate (BST) ferroelectric micro-particles can be expected. For PVDF the super-Arrhenius (SA) dynamics, associated with segmental motions freezing at the glass temperature Tg = 235 K, is evidenced. The addition of BST particles qualitatively changes dynamics, converting the SA-type behaviour in PVDF to the clear Arrhenius one in BST/PVDF composite. The latter crossovers to the relaxor-type SA dynamics on cooling, exactly at the glass temperature of PVDF. The preliminary model explaining such unique behaviour is proposed. For the consistent portraying of the SA evolution of primary relaxation times in PVDF and BST/PVDF, the activation energy index analysis was carried out and the new equation, entropy and symmetry controlled, is introduced. Studies are accomplished by the analysis of the ferroelectric-paraelectric transition in PVDF and for the composite system. They led to the discovery of the strong pretransitional anomaly of dε/dT , extending even to the vicinity of the room temperature, The semi-discontinuous nature of melting in PVDF and its composites, with the discontinuity metric T ≈ 20 K is suggested.

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Gelcasting of Al2O3–W composites: Broadband dielectric spectroscopy and rheological studies of tungsten influence on polymerisation kinetics

Kędzierska-Sar

Starzonek

Kukielski

et al. 2019

Ceramics International

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New dynamics in poly(propylene glycol) based glass-forming nanocomposites

Cited by 5 publications

References 35 publications

Unique dynamic crossover in supercooled x,3-dihydroxypropyl acrylate (x = 1, 2) isomers mixture

Unique dynamic crossover in supercooled x,3-dihydroxypropyl acrylate (x = 1, 2) isomers mixture

Polyvinylidene difluoride-based composite: glassy dynamics and pretransitional behaviour

Gelcasting of Al2O3–W composites: Broadband dielectric spectroscopy and rheological studies of tungsten influence on polymerisation kinetics

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