Effect of Surface Modification Agents on Hydrophobiic, Elastic and Thermal Property of Silica Aerogels Derived from Ambient Condition

被引：0

作者：

Wei Xiaoqing ^{[1
]}

Ni Xingyuan ^{[1
]}

Zu Guoqing ^{[1
]}

Shen Jun ^{[1
]}

Zhang Zhihua ^{[1
]}

机构：

[1] Tongji Univ, Shanghai Key Lab Special Artificial Microstruct M, Pohl Inst Solid State Phys, Shanghai 200092, Peoples R China

来源：

RARE METAL MATERIALS AND ENGINEERING | 2012年 / 41卷

关键词：

silica aerogels; surface modification; hydrophobicity; contact angle; modulus; CHEMICAL-MODIFICATION; PHYSICAL-PROPERTIES; PRECURSOR;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of different surface modification agents on the hydrophobic, mechanical and thermal properties of ambient pressure dried silica aerogels was studied. Aerogels were synthesized by sol-gel method using Tetramethoxysilane (TMOS), ethanol (EtOH) and hydrogen fluoride (HF) as precursor, solvent and catalyst, respectively. The optimal volume ratio of TMOS: EtOH: HF is 1: 3:0.05. Methyltrimethoxysilane (MTMS), hexamethyldisilazane (HMDZ) and trimethylchlorosilane (TMCS) were selected as surface modification agents, The characteristics of aerogels with different modifications were analyzed by Scan electron microscope, Contact angle meter, Fourier transform infrared spectroscopic, dynamic mechanical analyzer and hot disk thermal analyzer. The results show that aerogels modified with TMCS has the largest contact angle (149 degrees) followed by HMDZ agents, and the contact angle of aerogels modified with MTMS is the smallest (136 degrees). The mechanical and thermal properties of the three modified aerogels are good and show little differences. The elastic modulus of aerogels is about 3.85 MPa at room temperature and the thermal conductivity is as low as 0.029 W/(m.K).

引用

页码：454 / 457

页数：4

共 16 条

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