Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (03): 33-38.doi: 10.13475/j.fzxb.20181206506

• Fiber Materials • Previous Articles     Next Articles

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 E-mail:lifangliu@dhu.edu.cn

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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

CLC Number: 

  • TQ328.9

Fig.1

Infrared spectrum of unmodified CNF aerogel, K-CNF aerogel and M-CNF aerogel"

Tab.1

Density of aerogels"

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

Fig.2

SEM images of nanocellulose aerogel (×100)"

Fig.3

Stress-strain diagram of aerogel. (a) CNF aerogel; (b) K-CNF aerogel;(c) M-CNF aerogel"

Fig.4

Thermogravimetric curve of modified aerogel with different concentration of coupling agent. (a) CNF aerogel; (b) K-CNF aerogel;(c) M-CNF aerogel"

Fig.5

Test chart of contact angle"

Tab.2

Effect of silane content on thermal insulation properties of aerogelsW/(m·K)"

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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