Effects of multi-walled carbon nanotubes on char residue and carbothermal reduction reaction in ethylene propylene diene monomer composites at high temperature

Guo, Mengfei; Li, Jiang; Xi, Kun; Liu, Yang; Ji, Jianbo; Ye, Changqing

doi:10.1016/j.compscitech.2019.107916

Cited by 25 publications

(23 citation statements)

References 40 publications

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“…Interestingly, the pore size of char layers became smaller with the gradual increase in MWCNTs ( Figure S5 ), and the linear ablation rate started to decrease continually when the MWCNTs contents exceed 0.7 phr, which can be attributed to the effective blocking by progressively densified char layers. Meanwhile, elemental analysis was employed to evaluate the components on char layer surface, and it can be seen from Figure S6 that the proportion of Si obviously increased due to the addition of MWCNTs, and the char layers with more MWCNTs have more proportion of Si ( Figure S6 ), which revealed that the more gaseous silica was transformed to silicon carbide by the carbothermal reduction reaction under high-temperature condition [ 25 , 26 ], with less gaseous silica escaping from char layers.…”

Section: Resultsmentioning

confidence: 99%

“…), and thus, they were considered as highly effective ablative fillers. Especially MWCNTs with high strength and thermal conductivity are considered a promising ablative filler to improve the ablative resistance of EPDM-based insulators [ 25 , 26 , 27 , 28 , 29 ]. Li et al [ 25 , 26 ] found that the addition of MWCNTs in the EPDM-based insulators accelerates the carbothermal reduction reaction of silica to increase the char residue, resulting in the improvement of the ablative resistance.…”

Section: Introductionmentioning

confidence: 99%

“…Especially MWCNTs with high strength and thermal conductivity are considered a promising ablative filler to improve the ablative resistance of EPDM-based insulators [ 25 , 26 , 27 , 28 , 29 ]. Li et al [ 25 , 26 ] found that the addition of MWCNTs in the EPDM-based insulators accelerates the carbothermal reduction reaction of silica to increase the char residue, resulting in the improvement of the ablative resistance. In subsequent work, they [ 28 ] found that the char residues formed during the ablation can cover the surface of MWCNTs, which can effectively reduce the thermal conductivity of the char layers.…”

Section: Introductionmentioning

confidence: 99%

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Effects of MWCNTs on Char Layer Structure and Physicochemical Reaction in Ethylene Propylene Diene Monomer Insulators

Chen

Han

et al. 2022

Polymers

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As one of the most promising ablative fillers, multi-walled carbon nanotubes (MWCNTs) have been used to improve the ablative resistance of Ethylene–Propylene–Diene Monomer (EPDM) insulators by facilitating the carbothermal reduction reaction of silica. However, the contribution of MWCNTs to char layer structure of the insulators was unclear. In this work, the effects of MWCNTs on char layer structure and ablative resistance were investigated in different EPDM-based insulators with and without silica. The results showed that adding only 3 phr MWCNTs can reduce the linear ablation rate of EPDM-based insulators without silica by 31.7%, while 6 phr MWCNTs are required to obtain similar results in EPDM-based insulators with silica. The char layer morphology of the two insulators gradually evolved into a dense porous structure as MWCNTs content increased, but their formation mechanisms were different. The XRD and Raman spectrum showed that different physicochemical reactions occurred around MWCNTs under different charring components. The proposed ablation mechanism was further verified by designing alternating multilayer distribution of MWCNTs and silica. This work can guide the construction of desirable char layer structure for increasing the ablative resistance of EPDM-based insulators.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of MWCNTs on Char Layer Structure and Physicochemical Reaction in Ethylene Propylene Diene Monomer Insulators

Chen

Han

et al. 2022

Polymers

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“…The chemical reaction of SiC with other components at high temperature will affect the formation of the char layer, thus changing the characteristics of the char layer porous structure and the ablation resistance of the composites. [27] In this study, the EPDM composite insulation materials reinforced by SiC-NW and SiC-NP were prepared, respectively. The effects of SiC nanofillers on the mechanical properties and thermal conductivity of the composites were analyzed.…”

Section: Introductionmentioning

confidence: 99%

Effect of different nanostructured SiC on thermal, ablation and char layer mechanical properties of ethylene propylene diene monomer composites

Hui

Yan

et al. 2022

Polymer Composites

Self Cite

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SiC nanowire (SiC‐NW) and SiC nanopowder (SiC‐NP) were used to reinforce ethylene propylene diene monomer (EPDM) composites to improve their ablation and erosion resistance. The mechanical and thermal properties of the composites were investigated. The ablation resistance and thermal insulation performance of the composites were evaluated based on the oxyacetylene ablation and ablation motor experiments. In addition, the particle erosion resistance of the char layer was characterized. The test and experimental results show that, compared with the basic formulation, the ablation resistance of the formulations containing SiC‐NW and SiC‐NP increased by 85.54% and 71.08%, respectively. The particle erosion resistance of the char layer increased by 80.61% and 63.39%, respectively. Meanwhile, the SiC nanofiller reduced the thermal insulation performance of the EPDM composites. Compared with the basic formulation, the maximum back temperature of the SiC‐NW and SiC‐NP formulations increased by 39.23% and 13.08%, respectively. It inferred that during the ablation process, the SiC nanofiller can not only promote the deposition reaction of pyrolysis gas, but also react with oxidizing components and the char layer at different temperatures, thus improving the ablation resistance of the EPDM composites and the strength of the char layer. However, the high thermal conductivity of SiC nanofiller reduces the thermal insulation performance of the composites.

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“…Therefore, EMVS was employed as a host matrix with an aim to develop high-performance ablative resistant composites. Zinc borate (ZB) is a common fluxing agent and flame retardant, [26][27][28][29][30][31][32][33][34] which can reduce the generation temperature of ceramics. In the ablation process, a protective layer is formed in advance to protect the substrate, thereby enhancing the compactness of the substrate.…”

Section: Introductionmentioning

confidence: 99%

Ablation properties of zinc borate and aluminum hypophosphite filled silicone rubber composites

Zhang

Yan

Wang

et al. 2021

J of Applied Polymer Sci

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The ablative properties of epoxy modified silicone rubber composites filled with zinc borate (ZB) and aluminum hypophosphite (AHP) were studied. The decomposition of the added fillers and covering connection of residual on the substrate contribute to the improvement of heat insulation. The ablation test shows that the formation of a dense char layer with certain strength is key to improving the ablative properties. The optimal ablative performance is achieved when the concentration of ZB and AHP is 10 and 5 phr, respectively. Under such circumstances, the linear ablation rate is as low as 0.032 mm/s, which is about 61% lower than the pure silicone rubber. Furthermore, the structure and composition of the formed char layer were analyzed using X‐ray diffraction analysis, scanning electron microscopy, and Fourier transform infrared spectroscopy.

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Effects of multi-walled carbon nanotubes on char residue and carbothermal reduction reaction in ethylene propylene diene monomer composites at high temperature

Cited by 25 publications

References 40 publications

Effects of MWCNTs on Char Layer Structure and Physicochemical Reaction in Ethylene Propylene Diene Monomer Insulators

Effects of MWCNTs on Char Layer Structure and Physicochemical Reaction in Ethylene Propylene Diene Monomer Insulators

Effect of different nanostructured SiC on thermal, ablation and char layer mechanical properties of ethylene propylene diene monomer composites

Ablation properties of zinc borate and aluminum hypophosphite filled silicone rubber composites

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