Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (05): 23-30.doi: 10.13475/j.fzxb.20200901808

• Fiber Materials • Previous Articles     Next Articles

Rheological properties of cellulose/LiCl/ N, N-dimethylacetamide solution

YU Meiqiong1,2, YUAN Hongmei1, CHEN Lihui1()   

  1. 1. College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350108, China
    2. School of Ocean Science and Biochemistry Engineering, Fujian Polytechnic Normal University, Fuqing, Fujian 350300, China
  • Received:2020-09-07 Revised:2021-01-08 Online:2021-05-15 Published:2021-05-20
  • Contact: CHEN Lihui E-mail:lihuichen66@126.com

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Abstract:

In order to investigate the effect of rheological properties of cellulose solution on the spinnability of electrospinning, the steady and dynamic rheological properties of cellulose/LiCl/N, N-dimethylacetamide(DMAc)solution were studied,and electrospinning was carried out on this basis. It was found that the cellulose/LiCl/DMAc solutions were pseudoplastic fluid. The research results showed that the apparent viscosity, consistency coefficient and structural viscosity index of the solution decrease with the increase of temperature and increase with the increase of cellulose mass fraction, while the variations of non-Newtonian index were opposite. The non-Newtonian indices of the 2.5% and 3.0% cellulose/LiCl/DMAc solutions were closer to 1 at 20-60 ℃, meaning that the solutions have stable rheological properties. The structural viscosity indices of the 2.5% and 3.0% cellulose/LiCl/DMAc solutions were smaller, making them easier to spin, with 3.0% cellulose/LiCl/DMAc solution the optimal for electrospinning at room temperature.

Key words: cellulose, LiCl/N, N-dimethylacetamide, steady state rheology, dynamic rheology, electrospinning, spinnability

CLC Number: 

  • O636.11

Fig.1

Steady state rheological behavior of cellulose/LiCl/DMAc solutions at different temperature"

Tab.1

Non-Newtonian index n and consistency coefficient K of cellulose/LiCl/DMAc solutions at different temperatures"

温度/℃ K n
2.5% 3.0% 3.5% 4.0% 2.5% 3.0% 3.5% 4.0%
20 8.740 16.361 25.634 43.971 0.812 0.753 0.736 0.702
30 5.293 9.755 16.482 29.827 0.857 0.810 0.772 0.732
40 3.461 7.036 11.863 19.640 0.888 0.834 0.791 0.772
50 2.591 4.393 7.329 13.233 0.874 0.860 0.832 0.799
60 1.969 3.108 5.522 9.557 0.883 0.879 0.842 0.824

Tab.2

Structural viscosity index Δη of cellulose/LiCl/DMAc solutions at different temperatures"

温度/℃ Δη
2.5% 3.0% 3.5% 4.0%
20 7.559 9.582 10.216 11.486
30 6.007 7.645 8.943 10.384
40 4.852 6.785 8.246 8.939
50 5.006 5.697 6.778 8.002
60 5.510 4.922 6.297 7.032

Fig.2

Viscous flow activation energy of cellulose/LiCl/DMAc solution at different shear rates"

Fig.3

Dynamic rheological properties of cellulose/LiCl/DMAc solution with different mass fractions. (a) G' and G″ variation with frequency; (b) η* variation with frequency"

Fig.4

Dynamic rheological properties of cellulose/LiCl/DMAc solution at different temperatures. (a) G' and G″ variation with frequency; (b) η* variation with frequency"

Fig.5

Pictures of electrospun of cellulose/LiCl/DMAc solution with different mass fractions"

Fig.6

SEM images of electrospun fibers from 3.0% cellulose/LiCl/DMAc solution with diffrent magnification"

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