Effect of filler loading on polymer chain confinement and thermomechanical properties of epoxy/boron nitride (h-BN) nanocomposites

Joy, Jomon; George, Elssa; Thomas, Sabu; Anas, S.

doi:10.1039/c9nj05834f

Cited by 79 publications

(64 citation statements)

References 43 publications

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“…Owing to the highest flexibility, the unfilled vulcanizate exhibited the highest mechanical loss factor at T g (tan δ Tg of approximately 2.5). The addition of fillers decreased the height of the tan δ peak due to the reduction in the chains' mobility compared to the unfilled elastomer matrix [87]. As was concluded previously, based on the results of tensile properties, the applied fillers enhanced the stiffness and consequently reduced the flexibility of the NR vulcanizates and, therefore, the values of tan δ at T g .…”

Section: Nr Vulcanizates T G ( • C)supporting

confidence: 59%

Influence of Fillers and Ionic Liquids on the Crosslinking and Performance of Natural Rubber Biocomposites

Maciejewska

Sowińska

2021

Polymers

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This work concerns the effect of fillers and ionic liquids on the cure characteristics of natural rubber (NR) compounds, as well as the mechanical and thermal properties of the vulcanizates. Three types of white filler were applied, such as cellulose, nanosized silica and hydrotalcite, to modify the performance of NR composites. Additionally, ionic liquids (ILs) with bromide anion and different cations, i.e., 1-butyl-3-methylimidazolium (Bmi) and 1-butyl-3-methylpyrrolidinium (Bmpyr), were used to improve the cure characteristics of NR compounds and functional properties of the vulcanizates. The type of filler and the structure of ILs were proved to affect the rheometric properties and cure characteristics of NR compounds as well as the performance of the NR vulcanizates. Owing to the adsorption of curatives onto the surface, silica reduced the activity of the crosslinking system, prolonging the optimal vulcanization time of NR compounds and reducing the crosslinking degree of the elastomer. However, silica-filled NR exhibited the highest thermal stability. Hydrotalcite increased the crosslink density and, consequently, the mechanical properties of the vulcanizates, but deteriorated their thermal stability. ILs beneficially influenced the cure characteristics of NR compounds, as well as the crosslink density and mechanical performance of the vulcanizates, particularly those filled with silica. Cellulose did not significantly affect the vulcanization of NR compounds and crosslink density of the vulcanizates compared to the unfilled elastomer, but deteriorated their tensile strength. On the other hand, cellulose improved the thermal stability and did not considerably alter the damping properties of the vulcanizates.

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Section: Nr Vulcanizates T G ( • C)supporting

confidence: 59%

Influence of Fillers and Ionic Liquids on the Crosslinking and Performance of Natural Rubber Biocomposites

Maciejewska

Sowińska

2021

Polymers

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“…Mechanical properties of epoxy/h‐BN composites were effectively improved by the incorporation of 0.5 wt% h‐BN particles. [ 178 ] In another report by Chen et al, composites of epoxy fabricated using PVDF‐BN scaffolds showed significantly enhanced thermal conductivities compared with conventional epoxy/BN composites. [ 179 ] This type of epoxy‐based composite with high thermal conductivity can be identified as potential thermal management materials for advanced electronic devices.…”

Section: Polymer/boron Nitride Nanocomposites: Classificationsmentioning

confidence: 99%

An overview of boron nitride based polymer nanocomposites

Joy

George

Haritha

et al. 2020

Journal of Polymer Science

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Recently, boron nitride (BN) based materials have received significant attention in both academic and industrial sectors due to its interesting properties like large energy band gap, good resistance to oxidation, excellent thermal conductivity, thermal stability, chemical inertness, significant mechanical property and widespread applications. This review article deals with the preparation and properties of boron nitride and its nanocomposites with various polymers. Diverse polymers have been explored for the preparation of boron nitride filled polymer nanocomposites by adopting different mixing methods. Properties of the resulting polymer nanocomposites mainly depend up on filler size and dispersion, mixing conditions and type of interaction between polymer matrix and the filler. Herein, the structure, preparation and properties of various boron nitride based polymer nanocomposites are reviewed in detail along with a brief overview of different classes of BN nanomaterials.

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“…In addition, it could be stated that the increase in the viscosity of adhesive after 3% reinforcement ratio was effective in decrease T g values. 29,46 According to the curing exotherms, ΔH curing values were decreased in reinforced adhesives compared with unreinforced adhesives. In this context, the heat capacity (C p ) were reduced up to 5% reinforcement ratio compared to neat adhesive and then these values with increasing nanoparticle ratio.…”

Section: Results Of Dscmentioning

confidence: 99%

“…When the derivatives of the thermograms are examined, the maximum degradation temperatures for the 2nd step were found to be around 375-390 C. Reinforcement does not appear to have any negative effect on the degredation rate. 46,47 In addition, with addition into epoxy, total weight loss reduced up to 2% fortification. Weight loss values are near in 1, 2, and 3% ratios.…”

Section: Results Of Tgamentioning

confidence: 99%

Improvements of the structural, thermal, and mechanical properties of structural adhesive with functionalized boron nitride nanoparticles

Gülteki̇n

Uğuz

Özel

2021

J of Applied Polymer Sci

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Investigations on the production and development of nanoparticle-reinforced polymer materials have been attracted attention by researchers. Various nanoparticles have been used to improve the mechanical, chemical, thermal, and physical properties of polymer matrix composites. Boron compounds come to the fore to improve the mechanical and thermal properties of polymers. In this study, mechanical, thermal, and structural properties of structural adhesive have been examined by adding nano hexagonal boron nitride (h-BN) to epoxy matrix at different percentages (0.5, 1, 2, 3, 4, and 5%). For this purpose, nano h-BN particles were functionalized with 3-aminopropyltriethoxysilane (APTES) to disperse the h-BN nanoparticles homogeneously in epoxy matrix and to form a strong bond at the matrix interface. Two-component structural epoxy adhesive was modified by using functionalized h-BN nanoparticles. The structural and thermal properties of the modified adhesives were investigated by scanning electron microscopy and energy dispersion X-ray spectroscopy, Fourier transform infrared spectroscopy, differential scanning calorimetry, and thermogravimetric analysis techniques. Tensile test and dynamic mechanical analysis were performed to determine the mechanical properties of the adhesives. When the results obtained from analysis were examined, it was seen that the nano h-BN particles functionalized with APTES were homogeneously dispersed in the epoxy matrix and formed a strong bond. In addition that, it was concluded from the experimental results that the thermal and mechanical properties of adhesives were improved by adding functionalized nano h-BN particles into epoxy at different ratios.

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Effect of filler loading on polymer chain confinement and thermomechanical properties of epoxy/boron nitride (h-BN) nanocomposites

Abstract: This article examines the effect of the addition of hexagonal boron nitride (h-BN) nanopowder on the polymer chain confinement, thermal, morphological and mechanical properties of the epoxy system.

Cited by 79 publications

References 43 publications

Influence of Fillers and Ionic Liquids on the Crosslinking and Performance of Natural Rubber Biocomposites

Influence of Fillers and Ionic Liquids on the Crosslinking and Performance of Natural Rubber Biocomposites

An overview of boron nitride based polymer nanocomposites

Improvements of the structural, thermal, and mechanical properties of structural adhesive with functionalized boron nitride nanoparticles

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