Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (02): 1-6.doi: 10.13475/j.fzxb.20190203806

• Fiber Materials •     Next Articles

Preparation and properties of cellulose nanofiber/montmorillonite composite aerogels

DANG Danyang1,2, CUI Lingyan1, WANG Liang1(), LIU Yong1   

  1. 1. School of Textile Science and Engineering, Tiangong University, Tianjin 300387,China
    2. Key Laboratory of Tianjin Advanced Textile Composites, Tiangong University, Tianjin 300387, China
  • Received:2019-02-25 Revised:2019-11-11 Online:2020-02-15 Published:2020-02-21
  • Contact: WANG Liang E-mail:liangwang@tjpu.edu.cn

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Abstract:

To enhance the flammability and mechanical strength of cellulose nanofiber(CNF) aerogels, nanoscale montmorillonite (MMT) were introduced to CNF suspension, followed by a freeze-drying process to obtain CNF/MMT composite aerogels in this work. The effects of MMT content on the morphology characterization, compressive mechanical properties, thermal stability, thermal conductivity and flame retardancy of CNF/MMT composite aerogels were studied. The results show that the presence of MMT resulted in a denser lamellar structure of aerogels, which improved the mechanical properties, thermal stability and flame retardancy of aerogels. When the mass fraction of MMT is 50%, it is found that the CNF/MMT composite aerogels reaches the maximum density but only as low as 0.016 8 g/cm3, that the maximum stress becomes 12.45 kPa at 10% strain and 77.93 kPa at 70% strain, and that the maximum thermal conductivity is 0.04 W/(m·K). The limiting oxygen index values of CNF/MMT based aerogels shows significant increase when the mass fraction of MMT in aerogels is no less than 42.9%.

Key words: cellulose nanofiber, aerogel, montmorillonite, freeze-drying method, flame retardancy

CLC Number: 

  • TQ342

Tab.1

Composition of CNF/MMT composite aerogel precursor fluid"

样品
编号		 纤维素纳米纤
维质量分数/%		 蒙脱土质
量分数/%		 去离子
水体积/mL
1# 80.0 20.0 150
2# 66.7 33.3 150
3# 57.1 42.9 150
4# 50.0 50.0 150

Fig.1

Cross-section SEM images of CNF/MMT aerogels(×200)"

Fig.2

Compression stress-strain curves of CNF/MMT composite aerogels"

Tab.2

Apparent density and mechanical properties of CNF/MMT composite aerogels"

样品编号 密度/(g·cm-3) σ10%/kPa σ70%/kPa E/kPa Es/(kPa·g-1·cm-3)
1# 0.010 8 4.96±0.59 43.16±1.76 79.97±9.86 7 404.63±159.62
2# 0.012 4 5.60±1.14 44.93±3.03 94.49±9.27 7 620.16±139.20
3# 0.013 8 11.61±1.39 61.18±8.55 170.73±12.03 12 371.74±435.26
4# 0.016 8 12.45±1.35 77.93±3.28 165.89±11.79 9 874.40±269.27

Fig.3

TG (a) and DTG (b) curves of CNF/MMT composite aerogels"

Tab.3

TGA data characterization of CNF/MMT composite aerogels"

样品
编号		 Td5%/
℃		 Tdmax/
℃		 热分解速率/
(%·℃-1)		 残炭
量/%
1# 259.74 288.57 6.26 38.49
2# 265.89 289.26 4.32 52.81
3# 264.65 288.03 5.10 52.15
4# 262.10 283.50 3.90 62.50
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