Epoxy Composites Filled with Sodium Bicarbonate: Thermal and Mechanical Properties

The epoxy composites filled with 5 and 10 mass % of sodium bicarbonate were prepared. Sodium bicarbonate at the heating decomposes into sodium carbonate, carbon dioxide and water. As a result, sodium bicarbonate is able to slow down the combustion process when it used as polymer filler. The thermal stability of the prepared samples was investigated at the heating in air using thermal analysis. The mechanical characteristics of epoxy composites were also studied. The gaseous products of thermal oxidative degradation were studied using mass spectrometric analysis. It was found that sodium bicarbonate accelerates the process of thermal oxidative degradation of the epoxy composites in the initial stage, but enhances thermal stability in the final stage. The addition of boric acid to sodium bicarbonate as filler is recommended to improve the thermal stability of the epoxy polymer.

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Evidence from Thermal Aging Indicating That the Synergistic Effect of Glyoxal and Sodium Sulfite Improved the Thermal Stability of Conformational Modified Xanthan Gum

Polymers ◽

10.3390/polym14020243 ◽

2022 ◽

Vol 14 (2) ◽

pp. 243

Author(s):

Shuai Yuan ◽

Jiayuan Liang ◽

Yanmin Zhang ◽

Hongyu Han ◽

Tianyi Jiang ◽

...

Keyword(s):

Thermal Stability ◽

Production Process ◽

High Temperatures ◽

Conformational Changes ◽

Xanthan Gum ◽

Sodium Sulfite ◽

Oxidative Degradation ◽

Thermal Oxidative Degradation ◽

Original Strain ◽

Thermal Stability Of

Xanthan gum is prone to thermal oxidative degradation, which limits its applications. However, conformational changes in xanthan gum and appropriate stabilizers may improve its thermal stability. Therefore, in this study, we aimed to establish a strategy to maintain the viscosity of xanthan gum during long-term storage at high temperatures. We modified the original strain used for xanthan gum production by genetic engineering and added stabilizers during the production process. The structure and thermal stability of the resulting xanthan gum samples were then determined. Pyruvyl deficiency, combined with the addition of sodium sulfite and glyoxal during the production process, was found to significantly improve the maintenance of viscosity. The apparent viscosity of the new xanthan gum solution remained above 100 mPa·s after being stored at 90 °C for 48 days. Fourier-transform infrared spectra and scanning electron microscopy images showed that pyruvate-free xanthan gum with added stabilizers had more extensive cross-linking than natural xanthan gum. In conclusion, these findings may contribute to the use of xanthan gum in applications that require high temperatures for a long period of time.

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Effect of Nanodiamond Particles on Properties of Epoxy Composites

Advanced Composites Letters ◽

10.1177/096369350801700104 ◽

2008 ◽

Vol 17 (1) ◽

pp. 096369350801700 ◽

Cited By ~ 24

Author(s):

Zdeno Špitalský ◽

Alexander Kromka ◽

Libor Matějka ◽

Peter Černoch ◽

Jana Kovářová ◽

...

Keyword(s):

Thermal Stability ◽

Epoxy Composites ◽

Neat Epoxy ◽

Light Transmittance ◽

Cross Linking ◽

Amino Groups ◽

Multiwalled Carbon ◽

Epoxy Network ◽

Epoxy Nanocomposite ◽

Thermal Stability Of

The epoxy nanocomposites filled with 0.1, 0.5, and 1 wt% nanodiamonds (nanoD) were prepared and their properties were compared with neat epoxy network or epoxy nanocomposite filled with 1 wt% multiwalled carbon nanotubes (MWCNTs). The obtained nanoD-epoxy composites increased significantly thermal stability of prepared nanocomposites in comparison with neat epoxy matrix. The exponential decay of light transmittance with increasing concentration of nanoD in sample was observed. The values of storage modulus G` and glass transition temperature Tg significantly decreased by addition of nanoD to epoxy network. This is caused by inhibition of cross-linking reaction of epoxy- and amino- groups by nanoD.

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Effect of silica content on thermal stability of fumed silica/epoxy composites

Polymer Degradation and Stability ◽

10.1016/j.polymdegradstab.2008.08.006 ◽

2008 ◽

Vol 93 (12) ◽

pp. 2133-2137 ◽

Cited By ~ 74

Author(s):

J. Tarrío-Saavedra ◽

J. López-Beceiro ◽

S. Naya ◽

R. Artiaga

Keyword(s):

Thermal Stability ◽

Fumed Silica ◽

Silica Content ◽

Epoxy Composites ◽

Thermal Stability Of

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Covalent polymer functionalization of graphene for improved dielectric properties and thermal stability of epoxy composites

Composites Science and Technology ◽

10.1016/j.compscitech.2015.11.005 ◽

2016 ◽

Vol 122 ◽

pp. 27-35 ◽

Cited By ~ 122

Author(s):

Yan-Jun Wan ◽

Wen-Hu Yang ◽

Shu-Hui Yu ◽

Rong Sun ◽

Ching-Ping Wong ◽

...

Keyword(s):

Thermal Stability ◽

Dielectric Properties ◽

Epoxy Composites ◽

Thermal Stability Of

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Effects of physicochemical treatments of illite on the thermo-mechanical properties and thermal stability of illite/epoxy composites

Journal of Industrial and Engineering Chemistry ◽

10.1016/j.jiec.2010.10.012 ◽

2011 ◽

Vol 17 (1) ◽

pp. 77-82 ◽

Cited By ~ 16

Author(s):

Euigyung Jeong ◽

Jae Won Lim ◽

Kyeong-won Seo ◽

Young-Seak Lee

Keyword(s):

Mechanical Properties ◽

Thermal Stability ◽

Epoxy Composites ◽

Thermal Stability Of

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GM-Improved Antiaging Effect of Acrylonitrile Butadiene Styrene in Different Thermal Environments

Polymers ◽

10.3390/polym12010046 ◽

2019 ◽

Vol 12 (1) ◽

pp. 46

Author(s):

Yuchao Wang ◽

Ming Chen ◽

Miaoyu Lan ◽

Zhi Li ◽

Shulai Lu ◽

...

Keyword(s):

Thermal Stability ◽

Free Radicals ◽

Oxidation Process ◽

Oxidative Degradation ◽

Acrylonitrile Butadiene Styrene ◽

Active Species ◽

Tert Butyl ◽

Thermal Environments ◽

Thermal Stability Of ◽

Butadiene Styrene

A stabilizer called 2-tert-butyl-6-(3-tert-butyl-2-hydroxy-5-methylbenzyl)-4-methylphenyl acrylate (GM) was mixed in acrylonitrile butadiene styrene (ABS) with the same amount of 9-bis(octadecyloxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane (DSPDP), octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate (Irganox 1076) and tris(3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate (Irganox 3114) to investigate the influence of additives on the antiaging effect of ABS in oven aging or repeated extrusion aging. It was found that the ABS doped with the GM stabilizer showed a better yellowing resistance and thermal stability than the ABS doped with other antioxidants. Owing to the fact that the stabilizer can act on the free radicals before it has been peroxidized, it could trap the free radicals as a consequence of directly blocking the oxidation process of the active species, thus solving the problem of oxidative degradation of the materials from the source. This work provides guidance for improving thermal stability of ABS, indicating a promising potential for industrial application.

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Thermal and Mechanical Interfacial Behaviors of Graphene Oxide-Reinforced Epoxy Composites Cured by Thermal Latent Catalyst

Materials ◽

10.3390/ma12081354 ◽

2019 ◽

Vol 12 (8) ◽

pp. 1354 ◽

Cited By ~ 6

Author(s):

Shahina Riaz ◽

Soo-Jin Park

Keyword(s):

Thermal Stability ◽

Fracture Toughness ◽

Graphene Oxide ◽

Mechanical Performance ◽

Gradual Increase ◽

Diglycidyl Ether ◽

Crack Deflection ◽

Epoxy Composites ◽

Curing Agent ◽

Thermal Stability Of

A series of composites was prepared from a diglycidyl ether of bisphenol A (DGEBA) with different graphene filler contents to improve their mechanical performance and thermal stability. Graphene oxide (GO) and GO modified with hexamethylene tetraamine (HMTA) were selected as reinforcing agents. As a latent cationic initiator and curing agent, N-benzylepyrizinium hexafluoroantimonate (N-BPH) was used. The effect of fillers and their contents on the mechanical properties and thermal stability of the composites were studied. Fracture toughness improved by 23% and 40%, and fracture energy was enhanced by 1.94- and 2.27-fold, for the composites containing 0.04 wt.% GO and HMTA-GO, respectively. The gradual increase in fracture toughness at higher filler contents was attributed to both crack deflection and pinning mechanisms. Maximum thermal stability in the composites was achieved by using up to 0.1 wt.% graphene fillers.

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