Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (03): 50-55.doi: 10.13475/j.fzxb.20200607606

• Fiber Materials • Previous Articles     Next Articles

Preparation of polyacrylonitrile hollow porous shaped fibers and its performance

WANG Huiyun, WANG Ping, LI Yuanyuan, ZHANG Yan()   

  1. College of Textile and Clothing Engineering, Soochow University, Suzhou, Jiangsu 215000, China
  • Received:2020-06-30 Revised:2020-12-02 Online:2021-03-15 Published:2021-03-17
  • Contact: ZHANG Yan E-mail:yanzhang86@suda.edu.cn

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Abstract:

In order to obtain hollow porous fibers with thermal insulation performance, the coaxial wet spinning method was used to prepare irregular polyacrylonitrile fibers with both hollow and mesoporous structures. Polyacrylonitrile (PAN) and N,N-dimethylformamide (DMF) were blended to get cortical solution, and polyvinylpyrrolidone (PVP) and DMF were blended to get core solution. Subsequently, the solution was introduced to the coagulation bath through the coaxial shaped spinneret to obtain the primary fibers, and then the PAN-based shaped fibers with high porosity were obtained after washing and drying. Orthogonal experiments were adopted to optimize reaction conditions, and the structures and performance of the fiber were characterized. The results show that the fiber cross-section is of shaped profiles, and the sheath has a three-level structure with multi-scale pore diameters, including micropores (200 μm), submicron pores (200 nm) and nanopores (20 nm). The concentration of cortical solution is the main factor affecting the specific surface area of fiber. The breaking strength of the fiber can reach 390.88 cN. The thermal insulation performance of fiber is better than that of wool.

Key words: wet spinning, shaped fiber, hollow porous fiber, polyacrylonitrile fiber, thermal performance

CLC Number: 

  • TS104.72

Tab.1

Orthogonal experiment design scheme"

试验编号 A
PAN质量
分数/%		 B
PVP质量
分数/%		 C
皮芯层溶液
流速比		 D
凝固浴DMF
质量分数/%
1 10 10 1∶10 5
2 10 15 1∶20 10
3 10 20 1∶80 20
4 15 10 1∶20 20
5 15 15 1∶80 5
6 15 20 1∶10 10
7 17 10 1∶80 10
8 17 15 1∶10 20
9 17 20 1∶20 5

Fig.1

SEM images of hollow porous shaped PAN fibers. (a)Sample 1 (×70);(b) Sample 2 (×70); (c) Sample 3 (×70); (d) Sample 4 (×70); (e) Sample 5 (×70);(f) Sample 6 (×70); (g) Sample 7 (×70); (h) Sample 8 (×70); (i) Sample 9 (×70); (j) Partial enlarged view of sample 5 (×400); (k) Partial enlarged view of sample 5 (×1 000); (l) Partial enlarged view of sample 5 (×20 000)"

Tab.2

Size and structure parameters of hollow porous shaped PAN fiber"

样品编号 中空度/% 异形度/%
1 7.98 39.08
2 2.49 43.75
3 7.74 36.00
4 2.25 49.78
5 3.41 58.91
6 7.07 22.68
7 27.66 30.56
8 39.04 24.00
9 36.00 23.44

Fig.2

N2 adsorption-desorption isotherm of hollow porous shaped PAN ?bers. (a)Sample 1~3;(b)Sample 4~6;(c)Sample 7~9"

Tab.3

Pore structure parameters of hollow porous shaped ?ber"

样品编号 比表面积/
(m2·g-1)		 孔体积/
(cm3·g-1)		 孔直径/nm
1 24.58 0.081 16.37
2 8.50 0.052 68.20
3 10.86 0.046 31.01
4 17.75 0.073 18.39
5 10.45 0.074 41.51
6 9.90 0.067 33.73
7 4.43 0.004 5.11
8 7.48 0.008 4.82
9 5.82 0.028 58.99

Fig.3

XRD curves of hollow porous shaped PAN fiber"

Tab.4

Range analysis of results breaking force"

试验编号 因素 断裂强力/cN
A B C D
1 1 1 1 1 107.22
2 1 2 2 2 131.71
3 1 3 3 3 135.85
4 2 1 2 3 300.72
5 2 2 3 1 332.27
6 2 3 1 2 305.32
7 3 1 3 2 380.26
8 3 2 1 3 382.81
9 3 3 2 1 317.14
K1 374.78 788.20 795.35 756.63
K2 938.29 846.79 749.57 817.29
K3 1 080.21 758.31 848.38 818.93
k1 124.93 262.73 265.12 252.21
k2 312.76 282.26 249.86 272.43
k3 360.07 252.77 282.79 272.98
极差 235.14 29.49 32.94 20.77
主次因素 A>C>B>D
最优水平 A3 B2 C3 D3
最优组合 A3 B2 C3 D3

Fig.4

Thermal image of hollow porous shaped PAN fiber"

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