纺织学报 ›› 2020, Vol. 41 ›› Issue (03): 33-38.doi: 10.13475/j.fzxb.20181206506

• 纤维材料 • 上一篇    下一篇

硅烷偶联剂改性纳米纤维素气凝胶的制备及其表征

王世贤1, 降帅1, 李萌萌1, 刘丽芳1,2(), 张丽3   

  1. 1.东华大学 纺织学院, 上海 201620
    2.东华大学 纺织科技创新中心, 上海 201620
    3.吉祥三宝高科纺织有限公司, 安徽 阜阳 236500
  • 收稿日期:2018-12-29 修回日期:2019-09-24 出版日期:2020-03-15 发布日期:2020-03-27
  • 通讯作者: 刘丽芳
  • 作者简介:王世贤(1993—),女,硕士生。主要研究方向为纳米纤维素气凝胶的制备及应用。
  • 基金资助:
    江苏省苏州市科技计划项目(ZXL2018134)

Preparation and characterization of nanocellulose aerogel modified by silane coupling agent

WANG Shixian1, JIANG Shuai1, LI Mengmeng1, LIU Lifang1,2(), ZHANG Li3   

  1. 1. College of Textiles, Donghua University, Shanghai 201620, China
    2. Innovation Center for Textile Science and Technology, Donghua University, Shanghai 201620, China
    3. Jixiang Sanbao High-technology Textile Limited Company, Fuyang, Anhui 236500, China
  • Received:2018-12-29 Revised:2019-09-24 Online:2020-03-15 Published:2020-03-27
  • Contact: LIU Lifang

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摘要：

为研究硅烷偶联剂含量对纳米纤维素气凝胶性能的影响,选用氨丙基三乙氧基硅烷(KH-550)和甲基三甲氧基硅烷(MTMS)2种硅烷偶联剂对纳米纤维素(CNF)气凝胶进行修饰。通过扫描电子显微镜、热重分析仪、万能强力机和热常数分析仪进行测试与表征。结果表明:硅烷偶联剂的添加使改性气凝胶红外光谱图上出现了含硅峰值,但并未改变气凝胶的组分;改性后气凝胶的孔洞明显增多;MTMS与CNF的质量比为1∶2时,改性气凝胶的压缩回弹性最好(7.25 kPa);MTMS的添加使改性气凝胶具有良好的疏水性,接触角为156°;随着KH-550的添加,气凝胶导热系数先降低后升高;随着MTMS的添加,气凝胶导热系数逐渐降低。

关键词: 纳米纤维素, 气凝胶, 硅烷偶联剂, 氨丙基三乙氧基硅烷, 甲基三甲氧基硅烷

Abstract:

In order to study the influence of silane coupling agent content on the performance of nanocellulose aerogel, two silane coupling agents, aminopropyl triethoxysilane (KH-550) and methyl trimethoxysilane (MTMS), were selected to modify nanocellulose (CNF) aerogel. Characterization tests were carried out by scanning electron microscopy, thermogravimetric analyzer, universal strength machine and thermal constant analyzer. The results show that the addition of silane coupling agent results in the peak of silicon content in the modified aerogels, but does not change the composition of aerogels. The porosity of K-CNF aerogels and M-CNF aerogels increase significantly in comparison with the unmodified aerogels. When the addition ratio of MTMS is 1∶2, the optimal compression strength of the modified aerogels reaches 7.25 kPa, and the addition of MTMS improves the hydrophobicity of the modified aerogels with a contact angle of 156°. With the addition of KH-550, the thermal conductivity of aerogels first decreases and then increases. With the addition of MTMS, the thermal conductivity of aerogels decreases gradually.

Key words: nanocellulose, aerogel, silane coupling agent, aminopropy ltriethoxysilane, methy ltrimethoxysilane

中图分类号: 

  • TQ328.9

图1

未改性CNF气凝胶和K-CNF气凝胶、M-CNF气凝胶的红外光谱图"

表1

气凝胶的密度"

样品 m(纳米纤维素):
m(硅烷偶联剂)		 密度/
(mg·cm-3)
CNF气凝胶 — 10.86
K-CNF气凝胶 1:1 12.72
M-CNF气凝胶 1:2 14.59

图2

纳米纤维素气凝胶的SEM照片(×100)"

图3

气凝胶的应力-应变图 注:1~5分别表示纳米纤维素与KH-550或者MTMS的质量比为3:1,2:1,1:1,1:2,1:3。"

图4

气凝胶的热失重曲线 注:1~5分别表示纳米纤维素与KH-550或者MTMS的质量比为3:1、2:1、1:1、1:2、1:3。"

图5

接触角测试图"

表2

硅烷偶联剂添加量对气凝胶隔热性能的影响"

m(纳米纤维素):
m(硅烷偶联剂)		 导热系数
K-CNF气凝胶 M-CNF气凝胶
3:1 0.041 22 0.042 11
2:1 0.041 74 0.041 52
1:1 0.039 97 0.038 96
1:2 0.048 32 0.038 60
1:3 0.053 15 0.037 86
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