Mechanical and thermal properties of microchannel insulating foams comprising a multifunctional epoxy/polyhedral oligomeric silsesquioxane nanocomposite

Schmid, Eric D.; Veluswamy, N. Krishnan P.; Salem, David R.

doi:10.1002/pc.25772

Cited by 9 publications

(7 citation statements)

References 66 publications

(228 reference statements)

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“…Instead, the data shown in Figure 6 demonstrate that the thermal conductivities of these GNP reinforced microchannel foams fall within the scatter of the baseline conductivity data (with the curve-fitted model shown by the solid line). These findings align with our previous work using reinforcing polymer-ceramic hybrid additives, [46] where the hollow microchannel structure creates a dominant insulating effect which overwhelms any contributions to the solid-state thermal conductivity from the incorporated additives. In similar fashion, while the GNP appear to be sufficiently well dispersed within the foam matrix struts and filaments (as supported by the TGA data) to enhance the mechanical properties (as discussed below), it appears that the rGO GNP loading may be low enough to ensure that the thermal percolation threshold is not reached.…”

Section: Thermal Conductivitysupporting

confidence: 91%

Microchannel insulating foams comprising a multifunctional epoxy/graphene‐nanoplatelet nanocomposite

Schmid

Veluswamy

Klose

et al. 2022

Polymer Engineering & Sci

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Graphene nanomaterials have demonstrated simultaneous enhancement of both the thermal and mechanical properties of many base polymer systems, but for application as a reinforcement in multifunctional thermally insulating polymer foam the graphene additive must not significantly increase the macroscopic thermal conductivity. In an effort to study and decouple these mechanical and thermal properties, low loadings of reduced graphene oxide nanoplatelets have been added into epoxy formulations to comprise the matrix structure of hollow microchannel nanocomposite foams. Substantial improvements of 226% were achieved in the microchannel foam specific flexural modulus at only 0.15% graphene nanoplatelet loading without compromising the foam flexural strength and while also maintaining the low thermal conductivity of the baseline epoxy foam material. These results support the use of these nanocomposite foams as mechanically reinforced thermal insulation, with the addition of the graphene nanoplatelets potentially providing additional multifunctional improvements to the foam such as reduced UV-radiation transmittance, improved electrical surface conductivity for diminished static charge buildup, and/or lowering of the coefficient of thermal expansion for enhanced structural stability in extreme environments. This particular combination of multifunctional properties makes these materials well suited as high-performance structural thermal insulation materials in support of next generation space system applications.

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Section: Thermal Conductivitysupporting

confidence: 91%

Microchannel insulating foams comprising a multifunctional epoxy/graphene‐nanoplatelet nanocomposite

Schmid

Veluswamy

Klose

et al. 2022

Polymer Engineering & Sci

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“…It is reported that some rigid nanoparticles such as nanoclays, [26] nanosilica, [27] graphene oxide, [28][29][30][31] and nanotubes [32] can reinforce epoxy resin. Zhang et al improved the tensile properties of aliphatic epoxy resins by adding multi-walled carbon nanotubes treated with mixed acid.…”

Section: Introuductionmentioning

confidence: 99%

Enhance the mechanical properties of epoxy resin reinforced with functionalized graphene oxide nanocomposites prepared by atom transfer radical polymerization

Yang

Ma²,

Liu

et al. 2022

Polymer Composites

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Inspired by the strengthening effect of nanoparticles and the toughening effect of block polymers, we prepared a block polymer filler with graphene oxide (GO) as the main body by surface initiate atom transfer radical polymerization (SI‐ATRP). In the side groups of the main molecular segment of this block polymer, glycidyl methacrylate (GMA) fragment and N‐(3,4‐bis([tert‐butyldimethylsilyl]oxy)phenethyl)methacrylamide (DOPAmTBDMS) fragment can promote dispersion and toughening respectively. The molecular structure was characterized by Fourier transform infrared and X‐ray photoelectron spectroscopy. After the modified GO was added to the epoxy composite, the mechanical properties of the composite could be significantly improved. The toughness of epoxy composites was enhanced by crack deflection of the matrix. When the added amount of modified GO was 0.25 wt%, the flexural strength reached 151 MPa, which was 37.27% higher than pure epoxy composite. The tensile strength and izod impact strength were increased by 50.56% and 69.89%, respectively. These are attributed to the strengthening and toughening effects of GO and the side groups on it. This research had potential application value in the field of resin fillers and in combination with carbon fiber, metal and other materials.

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“…Silicone or its derivatives and thermoplastics are among the nontoxic modification routes to improve the thermal and mechanical properties of epoxy resin. [ 6–8 ] The application of silicone has gained increasing interests due to its oxidation and thermal stability. [ 9–12 ]…”

Section: Introductionmentioning

confidence: 99%

“…[5] Silicone or its derivatives and thermoplastics are among the nontoxic modification routes to improve the thermal and mechanical properties of epoxy resin. [6][7][8] The application of silicone has gained increasing interests due to its oxidation and thermal stability. [9][10][11][12] Bao and Cai [13] used methyl phenyl silicone (MPS) resin and a phosphorus compound named DOPO to improve the thermal properties of epoxy resins.…”

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Synthesis, characterization, and properties of silicone grafted epoxy/acrylonitrile butadiene styrene/graphene oxide nanocomposite with high adhesion strength and thermal stability

2022

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To improve thermal, mechanical and adhesion properties, epoxy resin was modified with methyl phenyl silicone (MPS), acrylonitrile butadiene styrene (ABS) and graphene oxide (GO). In order to increase compatibility and stability, MPS intermediate was grafted on epoxy resin through condensation reaction. Transmission electron microscopy images showed well dispersion of GO particles in the system proving successfully preparation of the MPS grafted epoxy/ABS/GO nanocomposite. Single lap shear strength for steel‐epoxy/carbon fiber composite joint in sample containing 15% MPS and 2% ABS improved up to 108% compared to neat epoxy. Such an improvement occurred when only 5% MPS, 2% ABS and 0.1% GO were used showing GO could decrease required content of modifiers in this case. Tensile strength of sample containing 5% MPS and 2% ABS was 49.89 MPa and it reached 55.23 MPa by adding 0.1% GO while it was 37.12 MPa in pure epoxy. Nanocomposite modified sample had a residual char of 20 wt%. at 600°C and increment of 30°C in initial degradation temperature and 7°C in maximum degradation temperature compared to pure epoxy. These finding beside 23% increasing in calculated activation energy using Kessinger's and FWO method's proved significantly improved thermal stability of modified epoxy resin. Scanning electron microscope images of fractured surface of specimens showed micro size domains obtained by phase separation cause toughness improvement and crack energy absorption.

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Mechanical and thermal properties of microchannel insulating foams comprising a multifunctional epoxy/polyhedral oligomeric silsesquioxane nanocomposite

Cited by 9 publications

References 66 publications

Microchannel insulating foams comprising a multifunctional epoxy/graphene‐nanoplatelet nanocomposite

Microchannel insulating foams comprising a multifunctional epoxy/graphene‐nanoplatelet nanocomposite

Enhance the mechanical properties of epoxy resin reinforced with functionalized graphene oxide nanocomposites prepared by atom transfer radical polymerization

Synthesis, characterization, and properties of silicone grafted epoxy/acrylonitrile butadiene styrene/graphene oxide nanocomposite with high adhesion strength and thermal stability

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