Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (02): 47-52.doi: 10.13475/j.fzxb.20201005507

• Fiber Materials • Previous Articles     Next Articles

Preparation of flax layered nano-cellulose and properties of its reinforced thermoelectric composites

HU Jing1, ZHANG Kaiwei2, LI Ranran1, LIN Jinyou3, LIU Yuqing1()   

  1. 1. College of Textile and Clothing Engineering, Soochow University, Suzhou, Jiangsu 215123, China
    2. Yuyue Home Textile Co., Ltd., Binzhou, Shandong 256600, China
    3. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
  • Received:2020-10-26 Revised:2020-11-12 Online:2021-02-15 Published:2021-02-23
  • Contact: LIU Yuqing E-mail:shliuyq@163.com

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Abstract:

In order to prepare layered nano-cellulose from natural flax fiber, i.e. coexistence of cellulose nanofiber (CNF) and cellulose nanocrystalline (CNC), and improve the preparation method of CNF from flax fiber, a method of alkaline treatment of flax fiber in a specific concentration of sodium hydroxide solution, followed by tempo mediated ternary oxidation and mechanical treatment, was proposed. The CNF/graphene composite films were prepared by compounding flax CNF with graphene to study the properties of flax CNF reinforced thermoelectric composites. The results show that the diameter and length of flax fiber become smaller and the hemicellulose is removed after alkaline pretreatment, which is an important step towards generation of CNF with different sizes. The optical transmittance of CNF suspension increases from 3.7% to 95.1% with the increase of NaOH concentration in the range of 0-18%, and the highest power factor of CNF/graphene composite film is 8.0 × 10 -3 μW/(M·K 2), which indicates that the composite film has thermoelectric properties.

Key words: nano-cellulose, composite film, reinforced thermoelectric composite, flax fiber, graphene

CLC Number: 

  • TS102.221

Fig.1

Optical micrographs of flax fiber alkalized with different mass fraction NaOH solution"

Fig.2

SEM image of flax fiber alkalized with different mass fraction NaOH solution"

Fig.3

FT-IR spectra of flax alkalized with different mass fraction NaOH solution"

Fig.4

XRD of flax fibers alkalized with different mass fraction NaOH solution"

Fig.5

UV-Vis spectra (a) and optical image (b) of FF-CNF aqueous suspension."

Fig.6

Optical microscope images of the resultant CNF aqueous suspensions"

Fig.7

Optical microscope images of FF-CNF films"

Fig.8

UV-Vis Spectra(a) and optical images(b) of FF-CNF film"

Fig.9

Preparation flow chart of graphene/CNF composite films"

Tab.1

Thermoelectric properties of graphene/CNF composite films"

石墨烯质
量分数/%		 电导率/
(S·m-1)		 塞贝克系数/
(μV·K-1)		 功率因子/
(10-4μW·m-1·K-2)
10.0 3.0 12.8 4.8
20.0 8.1 23.0 41.0
30.0 11.0 26.9 80.0
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