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材料工程  2015 

常压干燥制备疏水性SiO2-玻璃纤维复合气凝胶及表征

DOI: 10.11868/j.issn.1001-4381.2015.08.006, PP. 31-36

Keywords: SiO2气凝胶,玻璃纤维,常压干燥

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Abstract:

以正硅酸乙酯(TEOS)和甲基三乙氧基硅烷(MTES)为复合硅源,玻璃纤维为增强体,采用溶胶-凝胶和常压干燥工艺制备出疏水性SiO2-玻璃纤维复合气凝胶。利用N2吸附脱附、扫描电镜、高分辨透射电镜、红外光谱、接触角、热重-差热分析及力学测试等手段表征复合气凝胶,并分析预处理玻璃纤维时的盐酸浓度及浸泡时间对复合气凝胶密度的影响。结果表明当玻璃纤维的预处理条件为2.5mol/L盐酸浸泡0.5h时,制备得到的SiO2-玻璃纤维复合气凝胶表观密度最低,为0.12g/cm3,孔径主要分布在2~50nm,疏水角为142°,热稳定性温度高达500℃,抗压强度为0.05MPa,弹性模量为0.5MPa。

References

[1]  HUSING N, SCHUBERT U. Aerogels-airy materials: chemistry, structure, and properties[J]. Angewandte Chemie International Edition,1998,37(1-2):22-45.
[2]  SOLEIMAN D A, ABBASI M H. Silica aerogel; synthesis, properties and characterization[J]. Journal of Materials Processing Technology,2008,199(1-3):10-26.
[3]  FRICKE J, EMMERLING A. Aerogels-recent progress in production techniques and novel applications[J]. Journal of Sol-Gel Science and Technology,1998,13(1-3):299-303.
[4]  PAJONK G M. Some applications of silica aerogels[J]. Colloid and Polymer Science,2003,281(7):637-651.
[5]  SCHMIDT M, SCHWERTFEGER F. Applications for silica aerogel products[J]. Journal of Non-Crystalline Solids,1998,225:364-368.
[6]  KIM C Y, LEE J K, KIM B I. Synthesis and pore analysis of aerogel-glass fiber composites by ambient drying method[J]. Colloids and Surfaces A:Physicochemical and Engineering Aspects,2008,313:179-182.
[7]  高庆福, 冯坚, 张长瑞, 等. 陶瓷纤维增强氧化硅气凝胶隔热复合材料的力学性能[J]. 硅酸盐学报,2009,37(1):40-44.GAO Q F, FENG J, ZHANG C R, et al. Mechanical properties of ceramic fiber-reinforced silica aerogel insulation composites[J]. Journal of the Chinese Ceramic Society,2009,37(1):40-44.
[8]  MONER G M, MARTINEZ E,ESTEVE J,et al. Micromechanical properties of carbon-silica aerogel composites[J]. Applied Physics A,2002,74(1):119-122.
[9]  张贺新, 赫晓东, 李垚. 碳纳米管掺杂 SiO2气凝胶隔热材料的制备与性能表征[J]. 稀有金属材料与工程,2007,36(增刊1):567-569. ZHANG H X, HE X D, LI Y. Synthesis and characterization of SiO2 thermal insulation aerogel doped CNTs[J]. Rare Metal Materials and Engineering,2007,36(Suppl 1):567-569.
[10]  GUPTA N, RICCI W. Processing and compressive properties of aerogel/epoxy composites[J]. Journal of Materials Processing Technology,2008,198(1):178-182.
[11]  KIM G S, HYUN S H. Effect of mixing on thermal and mechanical properties of aerogel-PVB composites[J]. Journal of Materials Science,2003,38(9):1961-1966.
[12]  杨海龙, 倪文, 孙陈诚, 等. 硅酸钙复合纳米孔超级绝热板材的研制[J]. 宇航材料工艺,2006,36(2):18-22. YANG H L, NI W, SUN C C, et al. Development of xonotlite-silica aerogel nanoporous super insulation sheets[J]. Aerospace Materials & Technology,2006,36(2):18-22.
[13]  冯坚, 高庆福, 冯军宗, 等. 纤维增强SiO2气凝胶隔热复合材料的制备及其性能[J]. 国防科技大学学报,2010,32(1):40-44. FENG J, GAO Q F, FENG J Z, et al. Preparation and properties of fiber reinforced SiO2 aerogel insulation composites[J]. Journal of National University of Defense Technology,2010,32(1):40-44.
[14]  吕鹏鹏, 赵海雷, 刘欣, 等.常压干燥制备SiO2气凝胶的研究[J]. 材料工程,2012,(4):22-26. LU P P, ZHAO H L, LIU X, et al. Preparation of silica aerogel via ambient pressure drying[J]. Journal of Materials Engineering,2012,(4):22-26.
[15]  RAO A V, KALESH R R. Organic surface modification of TEOS based silica aerogels synthesized by co-precursor and derivatization methods[J]. Journal of Sol-Gel Science and Technology,2004,30(3):141-147.
[16]  YASUKI K,KAZUKI N,AKIRA M,et al. Synthesis of monolithic hierarchically porous iron-based xerogels from iron (III) salts via an epoxide-mediated sol-gel process[J]. Chemistry of Materials,2012,24(11):2071-2077.
[17]  VENKATESWARA R A, KULKAMI M M, AMALNERKAR D P, et al. Superhydrophobic silica aerogels based on methyltrimethoxysilane precursor[J]. Journal of Non-Crystalline Solids,2003,330(1):187-195.
[18]  JEONG A Y, KOO S M, KIM D P. Characterization of hydrophobic SiO2 powders prepared by surface modification on wet gel[J]. Journal of Sol-Gel Science and Technology,2000,19(1-3):483-487.
[19]  LEE C J, KIM G S, HYUN S H. Synthesis of silica aerogels from waterglass via new modified ambient drying[J]. Journal of Materials Science,2002,37(11):2237-2241.
[20]  RAO A P, RAO A V, BANGI U K H. Low thermalconductive, transparent and hydrophobic ambient pressure dried silica aerogels with various preparation conditions using sodium silicate solutions[J]. Journal of Sol-Gel Science and Technology,2008,47(1):85-94.
[21]  RAO A V, KALESH R R. Organic surface modification of TEOS based silica aerogels synthesized by co-precursor and derivatization methods[J]. Journal of Sol-Gel Science and Technology,2004,30(3):141-147.
[22]  DENG Z S, WANG J, WU A M, et al. High strength SiO2 aerogel insulation[J]. J Non-Cryst Solids,1998,255:101-104.

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