超临界干燥制备PSNB气凝胶及其超疏水性能研究

doi:10.11868/j.issn.1001-4381.2016.000958

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摘要

以聚硼硅氮烷为原料，二乙烯苯为交联剂，通过硅氢加成反应结合超临界干燥工艺制备聚硼硅氮烷气凝胶。利用红外光谱、扫描电镜、比表面积与孔径分析仪对所制备气凝胶的形成及微观结构进行了分析，并通过接触角仪对样品的疏水性能进行了研究。结果表明：聚硼硅氮烷和二乙烯苯通过硅氢加成反应制得聚硼硅氮烷气凝胶；所制备的气凝胶的比表面积为307~458cm²/g，孔体积为1.20~2.17cm³/g，孔径分布为2.0~100nm，是一种具有三维网状结构的介孔材料，并具有超疏水性能，且当起始溶剂体积分数为85%时，气凝胶疏水性能最佳，接触角为151.5°。

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	刘洪丽
	邓青沂
	褚鹏

关键词 ：聚硼硅氮烷, 硅氢加成反应, 气凝胶, 二氧化碳超临界干燥, 疏水性

Abstract：

The polyborosilazane aerogels were prepared by hydrosilylation reaction using polyborosilazane as raw material with divinylbenzeneas crosslinking agent, and then dried by CO₂ supercritical drying. Infrared spectroscopy, scanning electron microscopy, specific surface area and aperture analyzer, contact angle measurement were used to characterize the formation, microstructure and hydrophobic property of polyborosilazane aerogels. The results show that the polyborosilazane aerogels are prepared by hydrosilylation reaction using polyborosilazane with divinylbenzene; the specific surface areas of the resultant aerogels with three-dimensional network structure are in the range of 307-458cm²/g, which is a mesoporous material with superhydrophobic property. The pore volume is in the range of 1.20-2.17cm³/g and pore size is in the range of 2.0-100nm, and when the volume fraction of the starting solvent is 85%, the hydrophobic performance of polyborosilazane aerogels is the best, the water contact angle is 151.5°.

Key words： polyborosilazane hydrosilylation reaction aerogel CO₂ supercritical drying hydrophobic property

收稿日期: 2016-08-11 出版日期: 2018-02-01

中图分类号:

O648

基金资助:国家自然科学基金资助项目(51472175);天津市应用基础与前沿技术研究计划重点资助项目(15JCZDJC37200)

通讯作者: 刘洪丽 E-mail: lhlbh@163.com; 1599411585@qq.com

作者简介: 刘洪丽(1971-), 女, 教授, 博士, 研究方向为绿色化学建材, 联系地址:天津市西青区津静路26号天津城建大学材料学院(300384), E-mail: lhlbh@163.com, 1599411585@qq.com

引用本文:

刘洪丽, 邓青沂, 褚鹏. 超临界干燥制备PSNB气凝胶及其超疏水性能研究[J]. 材料工程, 2018, 46(2): 22-26.
Hong-li LIU, Qing-yi DENG, Peng CHU. Preparation and Hydrophobic Properties of Polyborosilazane Aerogels via CO₂ Supercritical Drying. Journal of Materials Engineering, 2018, 46(2): 22-26.

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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.000958 或 http://jme.biam.ac.cn/CN/Y2018/V46/I2/22

Fig.1 PSNB先驱体和PSNB气凝胶的红外光谱图

Fig.2 PSNB气凝胶实物照片

Fig.3 PSNB气凝胶的SEM照片 (a)PSNB-80；(b)PSNB-85；(c)PSNB-90；(d)PSNB-95

Fig.4 PSNB气凝胶不同起始溶剂浓度的吸附-脱附等温线(a)和孔径分布图(b)

Table 1 气凝胶不同溶剂浓度的微观结构参数表

Fig.5 PSNB气凝胶的接触角图像 (a)PSNB-80;(b)PSNB-85;(c)PSNB-90;(d)PSNB-95

Fig.6 PSNB-85气凝胶(密度为0.19g/cm³)浮于水面照片(a)及接触角图像(b)

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