Thermophysical properties of methacrylic polymer films with guest-host and side-chain azobenzene

Trefon-Radziejewska, Dominika; Hamaoui, Georges; Chirtoc, M.; Horny, Nicolas; Smokal, Vitaliy; Biitseva, Angelina V.; Krupka, Oksana; Derkowska-Zielinska, Beata

doi:10.1016/j.matchemphys.2018.11.054

Cited by 24 publications

(12 citation statements)

References 28 publications

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“…A more detailed description of the setup used can be found elsewhere [42]. Using this PTR setup, different types of material (nanocomposites [3], organic [43][44][45], irradiated [46], metal-semiconductor couples [42,47], etc.) can be thermally characterized to determine thermophysical properties, such as the thermal diffusivity and thermal effusivity.…”

Section: Methodsmentioning

confidence: 99%

Size effects of graphene nanoplatelets on the properties of high-density polyethylene nanocomposites: morphological, thermal, electrical, and mechanical characterization

Evgin

Turgut

Hamaoui

et al. 2020

Beilstein J. Nanotechnol.

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High-density polyethylene (HDPE)-based nanocomposites incorporating three different types of graphene nanoplatelets (GnPs) were fabricated to investigate the size effects of GnPs in terms of both lateral size and thickness on the morphological, thermal, electrical, and mechanical properties. The results show that the inclusion of GnPs enhance the thermal, electrical, and mechanical properties of HDPE-based nanocomposites regardless of GnP size. Nevertheless, the most significant enhancement of the thermal and electrical conductivities and the lowest electrical percolation threshold were achieved with GnPs of a larger lateral size. This could have been attributed to the fact that the GnPs of larger lateral size exhibited a better dispersion in HDPE and formed conductive pathways easily observable in scanning electron microscope (SEM) images. Our results show that the lateral size of GnPs was a more regulating factor for the above-mentioned nanocomposite properties compared to their thickness. For a given lateral size, thinner GnPs showed significantly higher electrical conductivity and a lower percolation threshold than thicker ones. On the other hand, in terms of thermal conductivity, a remarkable amount of enhancement was observed only above a certain filler concentration. The results demonstrate that GnPs with smaller lateral size and larger thickness lead to lower enhancement of the samples’ mechanical properties due to poorer dispersion compared to the others. In addition, the size of the GnPs had no considerable effect on the melting and crystallization properties of the HDPE/GnP nanocomposites.

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Section: Methodsmentioning

confidence: 99%

Size effects of graphene nanoplatelets on the properties of high-density polyethylene nanocomposites: morphological, thermal, electrical, and mechanical characterization

Evgin

Turgut

Hamaoui

et al. 2020

Beilstein J. Nanotechnol.

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“…In this work, the hysteresis of the thermophysical properties of VO 2 thin films deposited on either a r-sapphire or silicon substrate are measured along with the film-substrate interface thermal boundary resistance (TBR) R th (Kapitza thermal resistance) 41 , 42 by means of a high-frequency photothermal radiometry (PTR) 43 – 46 technique. The thermal diffusivity ( a ) and thermal effusivity ( e ) were directly measured experimentally via the PTR method, and then they were used to determine both k and C v of the thin films during their heating and cooling processes for temperatures within the VO 2 MIT.…”

Section: Introductionmentioning

confidence: 99%

Thermophysical characterisation of VO2 thin films hysteresis and its application in thermal rectification

Hamaoui

Horny

Gomez-Heredia

et al. 2019

Sci Rep

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Hysteresis loops exhibited by the thermophysical properties of VO 2 thin films deposited on either a sapphire or silicon substrate have been experimentally measured using a high frequency photothermal radiometry technique. This is achieved by directly measuring the thermal diffusivity and thermal effusivity of the VO 2 films during their heating and cooling across their phase transitions, along with the film-substrate interface thermal boundary resistance. These thermal properties are then used to determine the thermal conductivity and volumetric heat capacity of the VO 2 films. A 2.5 enhancement of the VO 2 thermal conductivity is observed during the heating process, while its volumetric heat capacity does not show major changes. This sizeable thermal conductivity variation is used to model the operation of a conductive thermal diode, which exhibits a rectification factor about 30% for small temperature differences (≈70 °C) on its terminals. The obtained results grasp thus new insights on the control of heat currents.

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“…The polymerization was carried out in 10 wt% N,N´-dimethylformamide solution of corresponding monomers m1a, m2a, m2b and methyl methacrylate (MMA) with monomers initial mole ratios 1:3. The polymerization was conducted using AIBN as a free radical initiator (1 wt% of monomer) at 80 ºC 48 h in argon atmosphere in the same way as reported (Guichaoua et al 2019;Trefon-Radziejewska et al 2019). The copolymerization ratios were calculated on the basis of the integrated peak areas of 1 H NMR spectra in DMSO-d 6 .…”

Section: Polymerizationmentioning

confidence: 99%

Influence of methyl group in a quinoline moiety on optical and light-induced properties of side-chain azo-polymers

et al. 2021

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We present the optical and photochromic properties as well as surface quality of thin films of the methacrylic copolymers containing 2-methylquinoline and quinoline azo-dyes in side chain. The extinction coefficient and refractive index were determined using spectroscopic ellipsometry combined with transmittance measurements. Photo-responsive behavior was investigated by determination of trans–cis photoisomerization rates under irradiation with unpolarized 365 nm light. We found that optical properties as well as photoisomerization rates of investigated polymers are dependent on the presence of a methyl substituent in the 2nd position of the quinoline moiety. The quality of the thin films was examined using Atomic Force Microscopy measurements.

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Thermophysical properties of methacrylic polymer films with guest-host and side-chain azobenzene

Cited by 24 publications

References 28 publications

Size effects of graphene nanoplatelets on the properties of high-density polyethylene nanocomposites: morphological, thermal, electrical, and mechanical characterization

Size effects of graphene nanoplatelets on the properties of high-density polyethylene nanocomposites: morphological, thermal, electrical, and mechanical characterization

Thermophysical characterisation of VO2 thin films hysteresis and its application in thermal rectification

Influence of methyl group in a quinoline moiety on optical and light-induced properties of side-chain azo-polymers

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