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通过构建交替平面结构增强三元乙丙橡胶烧蚀材料的隔热性能

Enhancing Thermal Insulation of EPDM Ablators via Constructing Alternating Planar Architectures.

作者信息

Qu Hongjian, Wang Le, Hui Kun, Bian Cheng, Li Hongyan, Guan Yiwen, Luan Tao, Yan Ning

机构信息

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

出版信息

Polymers (Basel). 2022 Apr 12;14(8):1570. doi: 10.3390/polym14081570.

DOI:10.3390/polym14081570
PMID:35458318
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9028349/
Abstract

Ethylene-propylene-diene monomer (EPDM) composites were usually enhanced with ablative additives to protect solid rocket motor (SRMs) casings. However, the poor thermal insulation caused by the high thermal conductive ablative fillers can lead to rocket motor failure. Herein, the novel EPDM composites containing alternating layers of ablative EPDM (AM) and heat-insulated EPDM (HM) were prepared through layer-multiplying extrusion. Compared with conventional EPDM ablative material, the multilayer composites showed enhanced thermal insulation and mechanical properties that could be further improved by tuning the number of layers. The ablation and thermal insulation properties possessing in AM and HM layers could be combined by forced assembly during co-extrusion, and the alternating multilayer composite was capable of showing the effect of each component. In particular, compared with AM, the maximum back-face temperature with 40 alternating layers of AM/HM decreased from 96.2 °C to 75.6 °C during oxyacetylene test, while the good ablation properties were preserved in the AM component. This significant improvement was attributed to the planar orientation and densification of ablative additives, and the interruption of conductive pathways in the through-plane direction of AM/HM alternating laminate. The anisotropic EPDM composites featuring mechanical robustness, good ablative resistance and thermal insulation suggest considerable potential application in the aerospace industry.

摘要

乙烯-丙烯-二烯三元共聚物（EPDM）复合材料通常会添加烧蚀添加剂来增强性能，以保护固体火箭发动机（SRM）外壳。然而，高导热烧蚀填料导致的隔热性能不佳可能会导致火箭发动机故障。在此，通过层倍增挤出制备了含有烧蚀性EPDM（AM）和隔热性EPDM（HM）交替层的新型EPDM复合材料。与传统的EPDM烧蚀材料相比，多层复合材料表现出增强的隔热和机械性能，可通过调整层数进一步改善。AM层和HM层所具有的烧蚀和隔热性能可在共挤出过程中通过强制组装相结合，交替多层复合材料能够展现出各组分的效果。特别是，与AM相比，在氧乙炔试验中，具有40个AM/HM交替层时的最大背面温度从96.2℃降至75.6℃，同时AM组分仍保留良好的烧蚀性能。这一显著改善归因于烧蚀添加剂的平面取向和致密化，以及AM/HM交替层压板在厚度方向上导电通路的中断。具有机械稳健性、良好抗烧蚀性和隔热性的各向异性EPDM复合材料在航空航天工业中具有相当大的潜在应用价值。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/23ca/9028349/00e8a353cb89/polymers-14-01570-g015.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/23ca/9028349/332afc382f00/polymers-14-01570-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/23ca/9028349/67424cc419b4/polymers-14-01570-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/23ca/9028349/326130101435/polymers-14-01570-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/23ca/9028349/2a9fdd8a7787/polymers-14-01570-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/23ca/9028349/7f821c93180f/polymers-14-01570-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/23ca/9028349/be5f5e61bdcf/polymers-14-01570-g011.jpg
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