Effect of Surface Modification on Thermal Stability, Flexural Properties, and Impact Strength of Epoxy/Graphene Nanocomposites

Jin, Fan‐Long; Ma, Chenhui; Guo, Bao‐Tian; Park, Soo‐Jin

doi:10.1002/bkcs.11858

Cited by 15 publications

(7 citation statements)

References 40 publications

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“…Pristine PF exhibited a smooth and flat morphology with an ordered cracking behavior, indicating brittle deformation before fracture, which accounts for its low‐impact strength, 42 as shown in Figure 11a. In contrast, the PF/H‐BS composites containing 5 and 10 wt% H‐BS exhibited a relatively rough morphology with many microcracks, indicating plastic deformation before fracture, 38,43 as shown in Figure 11b,c. When the H‐BS content was increased to 15 and 20 wt%, the fracture surfaces exhibited a rough morphology with numerous microcracks, which agrees with its high‐impact strength, 34,44 as shown in the high‐resolution images in Figure 11d,e.…”

Section: Resultsmentioning

confidence: 97%

“…The thermal degradation of the PF/H‐BS composites was investigated using TGA, and Figure 7 shows the corresponding TGA thermograms. Moreover, thermal stability factors, such as the initial decomposition temperature (i.e., the temperature of 5% weight loss [ T 5% ]), the temperature of 10% weight loss ( T 10% ), and the amount of char formation at 800°C, were calculated using the TGA thermograms 36–38 . Table 2 summarizes the results of the thermal stability factors.…”

Section: Resultsmentioning

confidence: 99%

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Enhanced thermal stability and impact strength of phenolic formaldehyde resin using acid‐treated basalt scales

Tang

Jin

et al. 2022

J of Applied Polymer Sci

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In this study, phenolic formaldehyde (PF) resin-based composites were prepared using basalt scale (BS) as a reinforcing agent via a melting-blending method. The BS surface was treated with hydrochloric acid, and the surface properties were characterized using thermal field-emission scanning electron microscopy, Fourier-transform infrared, X-ray photoelectron spectrometry, and energy-dispersive X-ray spectroscopy. Moreover, the influence of acidtreated BS (H-BS) content on the thermal properties, flexural properties, impact strength, and morphology of PF/H-BS composites was investigated. The thermal stability and glass transition temperature of the composites increased significantly with the increasing H-BS content. The impact strength tests indicated that the impact strength of the composite with 15 wt% H-BS was 0.66 kJ/m 2 , which is 153% higher than that of pristine PF. The scanning electron microscopy results indicated that the PF/H-BS composites exhibit rough morphology with numerous microcracks.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Enhanced thermal stability and impact strength of phenolic formaldehyde resin using acid‐treated basalt scales

Tang

Jin

et al. 2022

J of Applied Polymer Sci

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“…These results can be explained as follows: because EG is mainly composed of carbon, surface modification with the silane coupling agent resulted in the introduction of oxygen-containing functional groups such as C O, C O, and Si O on its surface. 43,44 Thus, the intensity of the C 1s peak decreased, while that of the O 1s and Si 2p peaks increased.…”

Section: Si@eg Characterizationmentioning

confidence: 99%

Improved thermal conductivity of epoxy resins using silane coupling agent‐modified expanded graphite

Jiang

Chu

Zhang

et al. 2022

J of Applied Polymer Sci

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A silane coupling agent was used to modify the surface of expanded graphite (EG), which was subsequently used as a thermally conductive filler to fabricate diglycidylether of bisphenol-A (DGEBA)/EG composites with high thermal conductivity via hot blending and compression-curing processes. The surface characteristics of silane coupling agent-modified EG (Si@EG) were characterized by a variety of analytical techniques. The effects of the Si@EG content on the thermal conductivity, thermal stability, impact strength, and morphology of the DGEBA/Si@EG composites were investigated. The results revealed that the addition of 80 wt.% Si@EG increased the thermal conductivity of the composites from 0.17 to 10.56 W/m K, which was 61.1 times higher than that of pristine DGEBA. The initial decomposition temperature of the composite containing 80 wt.% Si@EG was 60.6 C higher than that of pristine DGEBA. The impact strength of the composites decreased from 2.0 to 0.87 kJ/m 2 when the Si@EG content increased from 0 to 80 wt.%. The scanning electron microscopy images of the fractured surfaces revealed that the EG sheets in the DGEBA matrix formed a continuous thermally conductive path at high Si@EG contents.

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“…This was attributed to the strong intermolecular interaction between C 10 [VImBr] 2 and the PF matrix due to the formation 6a, pristine PF had a mirror-like morphology and ordered cracking behavior, indicating brittle deformation prior to fracture. 63 In contrast, the PF/Si-graphene composites exhibit a relatively rough morphology with numerous microcracks, indicating that they absorbed more external energy 64,65 (Figure 6b−e).…”

Section: Impact Strengthmentioning

confidence: 99%

Enhanced Electrical Properties and Impact Strength of Phenolic Formaldehyde Resin Using Silanized Graphene and Ionic Liquid

Li,

Lee,

Wang

et al. 2023

ACS Omega

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In this study, to improve the electrical properties and impact strength of phenolic formaldehyde (PF) resin, PF-based composites were prepared by mixing graphene and the ionic liquid 3-decyl-bis(1-vinyl-1H-imidazole-3-ium-bromide) (C10[VImBr]2) via hot blending and compression–curing processes. The graphene surface was modified using a silane coupling agent. The synergistic effect of graphene and C10[VImBr]2 on the electrical properties, electromagnetic shielding efficiency, thermal stability, impact strength, and morphology of PF/graphene and PF/graphene/C10[VImBr]2 composites was then investigated. It was found that the electrical conductivity of the composites significantly increased from 2.3 × 10–10 to 4.14 × 10–3 S/m with an increase in the graphene content from 0 to 15 wt %, increasing further to 0.145 S/m with the addition of 5 wt % C10[VImBr]2. The electromagnetic shielding efficiency of the composite increased from 4.70 to 28.64 dB with the addition of 15 wt % graphene, while the impact strength of the composites rose significantly from 0.59 to 1.13 kJ/m2 with an increase in the graphene content from 0 to 15 wt %, reaching 1.53 kJ/m2 with the addition of 5 wt % C10[VImBr]2. Scanning electron microscopy images of the PF/GNP/C10[VImBr]2 composites revealed a rough morphology with numerous microcracks.

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Effect of Surface Modification on Thermal Stability, Flexural Properties, and Impact Strength of Epoxy/Graphene Nanocomposites

Cited by 15 publications

References 40 publications

Enhanced thermal stability and impact strength of phenolic formaldehyde resin using acid‐treated basalt scales

Enhanced thermal stability and impact strength of phenolic formaldehyde resin using acid‐treated basalt scales

Improved thermal conductivity of epoxy resins using silane coupling agent‐modified expanded graphite

Enhanced Electrical Properties and Impact Strength of Phenolic Formaldehyde Resin Using Silanized Graphene and Ionic Liquid

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