柔性有机硅气凝胶复合材料的制备及性能研究
作者:
作者单位:

1.华东理工大学,化学工程联合国家重点实验室,上海 200237;2.中国空间技术研究所,北京 100074

作者简介:

姚鸿俊,1994年出生,硕士研究生,主要研究方向为有机硅/纤维复合材料。E-mail:Yao.Hongjun@outlook.com

通讯作者:

龙东辉,教授,博士生导师,主要研究方向为国防领域材料、环境治理和能源存储与转换。E-mail:longdh@ecust.edu.cn

中图分类号:

TB332


Preparation and Properties of Flexible Silicone Aerogel Composites
Author:
Affiliation:

1.State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237;2.China Academy of Space Technology, Beijing 100074

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    摘要:

    以甲基三甲氧基硅烷(MTMS)和二甲基二甲氧基硅烷(DMDMS)为前驱体,通过溶胶-凝胶、常压干燥制备出柔性有机硅气凝胶,研究了MTMS与DMDMS的摩尔比对其化学组成和微观结构的影响;采用莫来石纤维毡作为增强体,制备出密度为0.25 g/cm3的柔性有机硅气凝胶复合材料。实验结果表明,所制复合材料具有优异的热稳定性,其室温热导率在0.03 W/(m·K)以内;当MTMS和DMDMS的摩尔比为3.8∶1.2时,复合材料的均匀伸长率达3.6%、残重率达82.4%;复合材料经高温处理后,有机硅气凝胶转变为无机SiO2气凝胶,较好地保持煅烧前的微观形貌和隔热性能;通过500 s石英灯静态加热,发现复合材料的表面有陶瓷化反应,厚度方向无收缩,背部温升81℃,表现出烧蚀/隔热的双重特性。

    Abstract:

    Flexible silicone aerogels were prepared through sol-gel polymerization of methyltrimethoxysilane (MTMS) and dimethyldimethoxysilane (DMDMS), followed by ambient pressure drying. The effects of mole ratio of MTMS to DMDMS on the chemical composition and microstructure of silicone aerogels were analyzed. Furthermore, flexible aerogel composites with a low density of around 0.25 g/cm3 were prepared by using mullite fiber blanket as structure reinforced agent. The as-prepared composites have excellent flexibility, good thermal stability and low room-temperature thermal conductivity below 0.03 W/(m·K). When the ratio of MTMS to DMDMS was optimized to 3.8∶1.2, the resultant composites had the highest tensile elongation of 3.6% and char yield of 82%. After calcination of the composites, the silicone aerogels were convent into inorganic SiO2 aerogels with similar microstructure and thermal insulation. In static assessment of quartz lamp heating for 500 s, the surface of composites occurred ceramic reaction without obvious shrinkage at thickness direction, and there was 81℃-rise of their back temperature, demonstrating the combined functions of organic ablator and inorganic insulation properties.

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姚鸿俊,王飞,朱召贤,董金鑫,龙东辉.柔性有机硅气凝胶复合材料的制备及性能研究[J].宇航材料工艺,2019,49(6):26-32.

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  • 收稿日期:2019-01-10
  • 在线发布日期: 2019-12-30
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