基于DMDMS/VTMS共前驱体法制备柔性硅基气凝胶OA北大核心CSTPCD
Preparation of Flexible Silicon-based Aerogels by DMDMS/VTMS Co-precursor Method
气凝胶的易碎性、亲水性和高成本限制了其在民用领域的应用.本文提出了一种以二甲基二甲氧基硅烷(DMDMS)和乙烯基三甲氧基硅烷(VTMS)为共前驱体,采用常压干燥技术制备柔性疏水的聚倍半硅氧烷气凝胶的简单方法,研究了不同硅源配比对气凝胶结构和性能的影响.结果表明,当n(DMDMS/VTMS)=2∶3时,硅基气凝胶是三维纳米多孔结构,具有低密度(0.13g/cm3)、低热导率[2.919×10-2 W/(m·K)]和超疏水性(151°)的特点,在50％形变下,500次压缩循环后最大应力无明显变化.这种简单工艺制备的柔性气凝胶在隔热领域有着广阔的应用前景.
Due to the fragility,hydrophilicity and high cost,the application of aerogels in civil fields is limited.In this paper,the flexible and hydrophobic polysilsesquioxane aerogel has been prepared using dimethyldimethoxysilane(DMDMS)and vinyltrimethoxysilane(VTMS)as co-precursors through atmospheric pressure drying.The effects of different silicon source ratios on the structure and properties of aerogels were studied.When n(DMDMS/VTMS)=2∶3,the silicon-based aerogel exhibits a three-dimensional nanoporous structure,which has low density(0.13 g/cm3),low thermal conductivity[2.919×10-2 W/(m·K)]and superhydrophobicity(151°).Its maximum stress shows no significan change after 500 compression cycles under 50％deformation.According to this simple preparation process,the flexible aerogel has promising application prospects in the field of thermal insulation.
吕红丽;罗丽娟;郑振荣;李红晨;赵晓明
天津工业大学纺织科学与工程学院,天津 300387航天材料及工艺研究所,北京 100076天津工业大学纺织科学与工程学院,天津 300387天津工业大学纺织科学与工程学院,天津 300387天津工业大学纺织科学与工程学院,天津 300387
化学
聚倍半硅氧烷气凝胶疏水性柔性低热导率
Polysilsesquioxane aerogelHydrophobicityFlexibilityLow thermal conductivity
《宇航材料工艺》 2024 (6)
44-51,8
国家自然科学基金项目((52003071)北京市科技新星计划(Z211100002121090)
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