Redeposition and densification of pyrolysis products of polymer composites in char layer
Redeposition and densification of pyrolysis products of polymer composites in char layer
复制标题
聚合物复合材料热解产物在炭层中的再沉积和致密化
DOI：
10.1016/j.polymdegradstab.2019.06.004
复制
发表时间：
2019-08-01
影响因子：
5.9
通讯作者：
Liu, Yang
中科院分区：
文献类型：
--
作者：
Xi, Kun;Li, Jiang;Liu, Yang
在固体火箭发动机高温高压下，三元乙丙橡胶（EPDM）复合材料的热解会产生具有不均匀孔隙结构的炭化层，其致密的结构可以提高复合材料的抗烧蚀性能。研究炭化层致密结构的形成机理，对于进一步研究烧蚀机理和指导EPDM复合材料的开发具有重要的理论和实际意义。到目前为止，致密结构的形成机制还没有观察到直接的证据。本文设计并进行了EPDM复合材料的原位沉积实验和沉积烧蚀实验。原位沉积实验结果表明，EPDM复合材料产生的热解气体可以在半焦中发生化学气相沉积反应。沉积烧蚀实验结果表明，在SRMs烧蚀条件下，EPDM复合材料产生的热解气体在炭化层碳骨架表面发生化学气相沉积反应，导致炭化层孔隙结构致密化。(C)2019爱思唯尔有限公司版权所有。
Under high temperature and pressure of solid rocket motors (SRMs), the pyrolysis will produce a char layer with non-uniform pore structure of Ethylene propylene diene monomer (EPDM) composites, whose compact structure can improve the ablation resistance of the composites. It is of great theoretical and practical significance to study the formation mechanism of the compact structure of the char layer for further studying the ablation mechanism and guiding the development of EPDM composites. To date, the formation mechanism of the compact structure has not been observed with direct evidence. In this work, the in-situ deposition experiment and the deposition ablation experiment for EPDM composites are designed and carried out. The in-situ deposition experiment results show that the pyrolysis gas produced by EPDM composites can generate chemical vapor deposition reaction in the char. The results of the deposition ablation experiment show that the chemical vapor deposition reaction of pyrolysis gas produced by EPDM composites in carbon skeleton surface of the char layer will lead to the densification of its pore structure in the ablation condition of SRMs. (C) 2019 Elsevier Ltd. All rights reserved.