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多壁碳纳米管对三元乙丙橡胶绝缘子中炭层结构及物理化学反应的影响

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

作者信息

Chen Zhiheng, Han Shida, Ji Yuan, Wu Hong, Guo Shaoyun, Yan Ning, Li Hongyan

机构信息

The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China.

Xi'an Modern Chemistry Research Institute, Xi'an 710065, China.

出版信息

Polymers (Basel). 2022 Jul 26;14(15):3016. doi: 10.3390/polym14153016.

DOI:10.3390/polym14153016
PMID:35893979
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9330200/
Abstract

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.

摘要

作为最具前景的烧蚀填料之一，多壁碳纳米管（MWCNTs）已被用于通过促进二氧化硅的碳热还原反应来提高乙丙三元橡胶（EPDM）绝缘子的抗烧蚀性。然而，MWCNTs对绝缘子炭层结构的贡献尚不清楚。在这项工作中，研究了MWCNTs在有无二氧化硅的不同EPDM基绝缘子中对炭层结构和抗烧蚀性的影响。结果表明，仅添加3份/百份橡胶（phr）的MWCNTs可使无二氧化硅的EPDM基绝缘子的线性烧蚀率降低31.7%，而在含二氧化硅的EPDM基绝缘子中则需要6 phr的MWCNTs才能获得类似结果。随着MWCNTs含量的增加，两种绝缘子的炭层形态逐渐演变为致密的多孔结构，但其形成机制不同。X射线衍射（XRD）和拉曼光谱表明，在不同的炭化成分下，MWCNTs周围发生了不同的物理化学反应。通过设计MWCNTs和二氧化硅的交替多层分布，进一步验证了所提出的烧蚀机理。这项工作可为构建理想的炭层结构以提高EPDM基绝缘子的抗烧蚀性提供指导

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f4d6/9330200/5e450bec6919/polymers-14-03016-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f4d6/9330200/51845f1c9c44/polymers-14-03016-g001.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f4d6/9330200/bcbe825a10ef/polymers-14-03016-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f4d6/9330200/5d5eb26580d2/polymers-14-03016-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f4d6/9330200/c165795f64e6/polymers-14-03016-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f4d6/9330200/5e450bec6919/polymers-14-03016-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f4d6/9330200/51845f1c9c44/polymers-14-03016-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f4d6/9330200/c9cb0007f312/polymers-14-03016-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f4d6/9330200/c40ae22307ad/polymers-14-03016-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f4d6/9330200/a935fcae21c5/polymers-14-03016-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f4d6/9330200/bcbe825a10ef/polymers-14-03016-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f4d6/9330200/5d5eb26580d2/polymers-14-03016-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f4d6/9330200/c165795f64e6/polymers-14-03016-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f4d6/9330200/5e450bec6919/polymers-14-03016-g008.jpg

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