Investigation of the effects of silica aerogel particles on thermal and mechanical properties of epoxy composites

Kucharek, Mariusz; MacRae, William; Yang, Liu

doi:10.1016/j.compositesa.2020.106108

Cited by 43 publications

(23 citation statements)

References 26 publications

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“…The nitrogen adsorption–desorption curves and pore-size distribution curves, as well as the specific surface area of SCABs with different adding water volumes added to ACG and agarose solution concentrations, are shown in Figure 6 . The hysteresis loops of SCABs, which existed in the nitrogen adsorption–desorption isotherm, were type-IV isotherms, representing mesoporosity [ 33 ]. Compared with AABs, the nitrogen adsorption and the relative Brunauer–Emmett–Teller (BET) surface area ( Figure 6 a,c) of the SCABs were higher.…”

Section: Resultsmentioning

confidence: 99%

Robust SiO2–Al2O3/Agarose Composite Aerogel Beads with Outstanding Thermal Insulation Based on Coal Gangue

et al. 2022

Gels

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Advanced SiO2–Al2O3 aerogel materials have outstanding potential in the field of thermal insulation. Nevertheless, the creation of a mechanically robust and low-cost SiO2–Al2O3 aerogel material remains a considerable challenge. In this study, SiO2–Al2O3 aerogel based on coal gangue, which is a type of zero-cost inorganic waste, was constructed in porous agarose aerogel beads, followed by simple chemical vapor deposition of trimethylchlorosilane to fabricate SiO2–Al2O3/agarose composite aerogel beads (SCABs). The resulting SCABs exhibited a unique nanoscale interpenetrating network structure, which is lightweight and has high specific surface area (538.3 m2/g), hydrophobicity (approximately 128°), and excellent thermal stability and thermal insulation performance. Moreover, the compressive strength of the SCABs was dramatically increased by approximately a factor of ten compared to that of native SiO2–Al2O3 aerogel beads. The prepared SCABs not only pave the way for the design of a novel aerogel material for use in thermal insulation without requiring expensive raw materials, but also provide an effective way to comprehensively use coal gangue.

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Section: Resultsmentioning

confidence: 99%

Robust SiO2–Al2O3/Agarose Composite Aerogel Beads with Outstanding Thermal Insulation Based on Coal Gangue

et al. 2022

Gels

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“…By increasing the SA content from 0 to 5 phr, the TC of the blend composites is significantly reduced, which is similar to other works. [ 46,47,59,60 ] In fact, SA has excellent thermal insulation properties due to its crosslinking silica networks, nanoscale pore size, and high porosity. On the other hand, since 90% of its volume is air, its TC (0.021

normalW / normalm normalK

at 0°C under 1 bar) can be equal to or even less than air.…”

Section: Resultsmentioning

confidence: 99%

Polycarbonate/poly(methyl methacrylate)/silica aerogel blend composites for advanced transparent thermal insulations: Mechanical, thermal, and optical studies

et al. 2021

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Using transparent thermal insulators, which are low heat conductors and good light transmitters, is a brilliant idea to preserve heat energy. In this regard, silica aerogels (SAs) have attracted immense attention these days because of their unique nanoporous networks, consisting of connective silica nanoparticles and high-volume nanopores. The present study investigates the influence of incorporating 3 and 5 phr SAs on the mechanical properties, thermal conductivity (TC), and optical characteristics of polycarbonate/poly(methyl methacrylate) (PC/PMMA) (75/25, 50/50, and 25/75 w/w) blends. The scanning electron microscopy studies indicated that the PC/PMMA/SA (25/75/3) composite has the best dispersion. The highest improvements in tensile strength and Young's modulus were observed for the PC/PMMA/SA (75/25/5) composite. In addition, incorporating the SA resulted in a reduction in the impact strength of all the blends. The lowest TC was observed for the PC/PMMA/SA (75/25/5) blend composite. The TC results were compared with the data predicted by the Agari, Russell, Maxwell-Eucken, and Bruggeman models. It was found that the Agari logarithmic model has the best agreement with the experimental data. Except for PC, PMMA, PC/PMMA (25/75), and PC/PMMA/SA (25/75/3), no other samples showed optical transmittance. On average, PC/PMMA/SA (25/75/3) had 13% more light absorption than PC/PMMA (25/75). K E Y W O R D S blend composite, optical transmittancy, poly(methyl methacrylate), polycarbonate, silica aerogel, thermal conductivity | INTRODUCTIONAs an important group of engineering materials, polymer blends can be used in an extensive range of applications by tuning their chemical and physical properties. Thus, a new material possessing desired properties and enhanced performance can be prepared using polymer blending techniques. It has been well proved that creating a new resin is much more expensive than preparing a new blend. [1][2][3][4][5][6][7][8] That is why polymer blends have been the topic of immense interest in recent years.Due to its sufficient stiffness, high impact strength, good dimensional stability, high temperature stability, and, most significantly, excellent transparency, polycarbonate (PC) is utilized for various applications. However, PC suffers from some disadvantages including poor

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“…The study was conducted on a resin that is a mixture of bisphenol-A epoxy resin and epichlorohydrin-formaldehyde-phenol polymer, and a cycloaliphatic amine-based hardener was used as the curing agent. The introduction of silica aerogel particles into the resin led to a significant reduction in both the density of the resin and its thermal conductivity [21].…”

Section: Heat Aerogelmentioning

confidence: 99%

“…Despite the numerous requirements and the wide range of research to be carried out, dynamic development in the field of aerospace materials is currently taking place [12][13][14]. The numerous material solutions presented in the literature testify to the constant interest of the scientific community in making a real impact on the occurrence of synergies between the acquisition of knowledge and its practical application [15][16][17][18][19][20][21][22]. The issues related to the modification of polymer matrix composites are new with respect to materials science, although they are extremely extensive due to the intensification of research carried out in scientific centers all over the world [23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Behavior of Aviation Polymer Composites at Various Weight Fractions of Physical Modifier

et al. 2021

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The aim of this study was to determine the effect of a selected physical modifier with different granularity and mass percentage on the dynamics of aerospace polymer composites. The tests were carried out on samples made of certified aerospace materials used, among other purposes, for the manufacture of aircraft skin components. The hybrid composites were prepared from L285 resin, H286 hardener, GG 280T carbon fabric in twill 2/2 and alumina (Al2O3, designated as EA in this work). The manufactured composites contained alumina with grain sizes of F220, F240, F280, F320 and F360. The mass proportion of the modifier in the tested samples was 5% and 15%. The tested specimens, as cantilever beams fixed unilaterally, were subjected to kinematic excitation with defined parameters of amplitude and frequency excitation in the basic resonance zone of the structure. The results, obtained as dynamic responses, are presented in the form of amplitude–frequency characteristics. These relationships clearly indicate the variable nature of composite materials due to modifier density and grain size. The novelty of this study is the investigation of the influence of the alumina properties on system dynamics responses.

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Investigation of the effects of silica aerogel particles on thermal and mechanical properties of epoxy composites

Cited by 43 publications

References 26 publications

Robust SiO2–Al2O3/Agarose Composite Aerogel Beads with Outstanding Thermal Insulation Based on Coal Gangue

Robust SiO2–Al2O3/Agarose Composite Aerogel Beads with Outstanding Thermal Insulation Based on Coal Gangue

Polycarbonate/poly(methyl methacrylate)/silica aerogel blend composites for advanced transparent thermal insulations: Mechanical, thermal, and optical studies

Dynamic Behavior of Aviation Polymer Composites at Various Weight Fractions of Physical Modifier

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