Influence of drying procedure on glass transition temperature of PMMA based nanocomposites

Eriksson, Maria; Goossens, Jgp Han; Peijs, Ton

doi:10.1179/2055033214y.0000000005

Cited by 36 publications

(25 citation statements)

References 60 publications

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“…A recent published paper indicates that, in most cases, the presence of nanoparticles, in particular oxides, causes an increment of T g thanks to the formation of interactions, primarily hydrogen bonds, between the nanoparticles and the polymer chains, which slow down the α relaxation of the polymer, and give rise to an immobilized polymer layer surrounding the nanoparticles . Other studies on PMMA nanocomposites, mainly prepared using solvent based methods, point out a decrease in the glass transition temperature . The thermodynamic model developed by Kyung Ju Lee to describe the T g behavior of binary polymer/nanoparticles systems, states that T g increases or decreases depending on the negative or positive change of the total configurational entropy.…”

Section: Resultsmentioning

confidence: 99%

Thermal properties and electric modulus approach to the analysis of dielectric relaxation of nanocomposites based on carbon dots

et al. 2019

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The investigation of thermal and dielectric properties of carbon dots dispersed in PMMA has been conducted in freestanding thin solid films. Thermal properties were studied using differential scanning calorimetry. Impedance spectroscopy, in the frequency range 100 Hz to 100 kHz and temperatures between 200 and 390 K, was used for the electrical characterization. Using the electric modulus formalism, it has been found that the Havriliak‐Negami model of dielectric relaxation is adequate to fit the experimental data, from which the relaxation parameters can be calculated. The inclusion of C‐Dots in PMMA provides a plasticizing effect on the polymer structure, giving rise to an increase in the mobility of PMMA chains, and consequent changes in the relaxation parameters.

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Section: Resultsmentioning

confidence: 99%

Thermal properties and electric modulus approach to the analysis of dielectric relaxation of nanocomposites based on carbon dots

et al. 2019

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“…Literature data concerning effect of additives on T g are conflicting. Glass transition temperatures of composites based on different matrix polymers and different nanofillers may either increase or decrease, and in some cases, do not differ from T g values of matrix polymers . Even two different glass transitions with T g both lower and higher than the T g of polymer matrix have been observed .…”

Section: Resultsmentioning

confidence: 96%

“…The explanation of T g drop of the composite by the presence of residual solvent (Ref. ) should be analyzed more thoroughly, since residual solvent can indeed act as a plasticizer. In this work, commercial PMMA synthesized by radical polymerization was used (neither MW nor MWD of the polymer were given, although the authors claimed that they obtained these characteristics for all samples).…”

Section: Resultsmentioning

confidence: 99%

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Destructive changes of polymer matrices during preparation, storage, and mechanical testing of neat and C₆₀‐filled polystyrene films

Chubarova

Lebedeva

Melenevskaya

et al. 2016

J of Applied Polymer Sci

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Mechanical properties of filled and neat polystyrene films prepared under the same conditions have been studied. Composite films have been obtained from mixed dilute solutions of polystyrene and C 60 fullerene in various solvents by solvent evaporation on glass substrate. Morphology of the composite films has been shown to depend on preparation conditions and to change both with time and during deformation. Mechanical parameters obtained in tensile tests and by dynamic mechanical analysis of filled and unfilled samples have been found to change with molecular weight of the matrix and preparation conditions as well as during testing. Variability of mechanical properties has been shown to be the effect of destructive changes in polymer matrices during preparation, storage, and deformation.

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“…To improve the thermal and mechanical properties of the PMMA, fillers such as metal oxides are used [4][5][6][7]. Aluminum oxide or alumina is a good candidate for this purpose because of its unique mechanical and thermal properties [8][9][10]. Many nanocomposite properties are affected by the amount of filler adhesion to the polymer matrix [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Glass transition temperature of PMMA/modified alumina nanocomposite: molecular dynamic study

Mohammadi

Davoodi

Javanbakht

et al. 2018

Mater. Res. Express

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In this study, the effect of alumina and modified alumina nanoparticles in a PMMA/alumina nanocomposite was investigated. To attain this goal, the glass transition behavior of poly methyl methacrylate (PMMA), PMMA/alumina and PMMA/hydroxylated alumina nanocomposites were investigated by molecular dynamic simulations (MD). All the MD simulations were performed using the Materials Studio 6.0 software package of Accelrys. To obtain the glass transition temperature, the variation of density vs. temperature was obtained. The temperature at which the slope of the density-temperature curve observably changes is defined as the glass transition temperature (Tg). The effect of alumina nanoparticles on the Tg was related to the free volume and the mobility of chain segments and the interaction between the alumina nanoparticles and the polymer. The mobility of the chain segments was investigated based on the mean square displacement and radius gyration. The results show that the increasement the Tg of the PMMA/hydroxylated alumina nanocomposite is more than that of the PMMA/alumina nanocomposite due to the modification of the alumina nanoparticles. Highlights: The glass transition of PMMA/modified alumina and PMMA/alumina nanocomposite was calculated  The mobility, Energy and gyration radius and energy of system was investigated.

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Influence of drying procedure on glass transition temperature of PMMA based nanocomposites

Cited by 36 publications

References 60 publications

Thermal properties and electric modulus approach to the analysis of dielectric relaxation of nanocomposites based on carbon dots

Thermal properties and electric modulus approach to the analysis of dielectric relaxation of nanocomposites based on carbon dots

Destructive changes of polymer matrices during preparation, storage, and mechanical testing of neat and C₆₀‐filled polystyrene films

Glass transition temperature of PMMA/modified alumina nanocomposite: molecular dynamic study

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Influence of drying procedure on glass transition temperature of PMMA based nanocomposites

Cited by 36 publications

References 60 publications

Thermal properties and electric modulus approach to the analysis of dielectric relaxation of nanocomposites based on carbon dots

Thermal properties and electric modulus approach to the analysis of dielectric relaxation of nanocomposites based on carbon dots

Destructive changes of polymer matrices during preparation, storage, and mechanical testing of neat and C60‐filled polystyrene films

Glass transition temperature of PMMA/modified alumina nanocomposite: molecular dynamic study

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Destructive changes of polymer matrices during preparation, storage, and mechanical testing of neat and C₆₀‐filled polystyrene films