化工新型材料

化工新型材料 ›› 2019, Vol. 47 ›› Issue (3) : 207-210. DOI:

科学研究

温度对SiO₂气凝胶表面疏水官能团数量及疏水性的影响

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Influence of temperature on hydrophobic functional group and hydrophobicity of silica aerogel

Zhao Haiqian¹,Liu Chenghao¹,Han Rui²,Wang Zhonghua¹,Liu Lijun¹,Liu Xiaoyan¹,Gao Jihui²

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摘要

SiO₂气凝胶颗粒多采用表面修饰甲基官能团的方法进行疏水改性。该方法存在受热后疏水官能团断裂,疏水性下降的问题。目前官能团数量及疏水性随温度及加热时间的变化规律以及官能团数量与接触角之间的关系尚不明确。采用三甲基氯硅烷对SiO₂进行疏水改性。利用傅里叶红外光谱和接触角测试方法分析了疏水SiO₂气凝胶表面甲基官能团数量及疏水性随温度、加热时间的变化规律,在此基础上明确了接触角与官能团数量之间的关系。结果表明:提高受热温度及加热时间均会使疏水SiO₂气凝胶颗粒表面甲基官能团数量变小,进而降低静态接触角。当温度达到600℃时,甲基官能团完全消失,材料失去疏水能力。材料接触角与表面甲基官能团损失量近似呈正比关系。

Abstract

SiO₂ aerogel particles are mostly hydrophobic modified by modifying organic functional groups on the surface.However,this method has the problem that the hydrophobic functional group breaks and the hydrophobicity decreases after heating.At present,the variation of number of functional groups and hydrophobicity with temperature and heating time is not clear,and the relationship between the number of functional groups and the contact angle has not yet been clarified.SiO₂ was hydrophobic modified by trimethylchlorosilane.The change of methyl functional groups number and the hydrophobicity of aerogel with temperature and heating time was analyzed by using fourier transform infrared spectroscopy and contact angle test.Then,the relationship between the contact angle and the number of functional groups was clarified.The results showed that increasing the heating temperature and heating time can reduce the amount of methyl groups on the surface of aerogel particles,which reduced the static contact angle of material.When the temperature reached 600℃,the methyl functional groups completely disappeared and the material losed its hydrophobicity.The contact angle of material was approximately inversely proportional to the loss of surface methyl groups.

关键词

SiO₂气凝胶 / 绝热 / 疏水性 / 甲基官能团 / 温度

Key words

SiO₂ aerogel / thermal insulation / hydrophobicity / methyl functional group / temperature

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温度对SiO₂气凝胶表面疏水官能团数量及疏水性的影响[J]. 化工新型材料, 2019, 47(3): 207-210 DOI:

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