Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (10): 1-9.doi: 10.13475/j.fzxb.20211202809

• Fiber Materials •     Next Articles

Preparation of dendritic nanofiber membrane induced by hyperbranched quaternary ammonium salt and its properties

YAO Ying1, ZHAO Weitao2, ZHANG Desuo1(), LIN Hong1, CHEN Yuyue1, WEI Hong3   

  1. 1. College of Textile and Clothing Engineering, Soochow University, Suzhou, Jiangsu 215021, China
    2. Changzhou Vocational Institute of Textile and Garment, Changzhou, Jiangsu 213164, China
    3. Suzhou Institute of Fiber Inspection, Suzhou, Jiangsu 215004, China
  • Received:2021-12-13 Revised:2022-03-09 Online:2022-10-15 Published:2022-10-28
  • Contact: ZHANG Desuo E-mail:dszhang@suda.edu.cn

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Abstract:

In order to develop membrane materials with high efficiency filtration performance, this research prepared polyvinylidene fluoride (PVDF) dendritic nanofiber membranes using hyperbranched quaternary ammonium salt (HBP-HTC) as a branching promoter based on electrostatic spinning technology in one step. The influence of the spinning process on the forming structure of the fiber membrane was explored. The mechanical properties of the dendritic nanofiber membrane were analyzed and its air filtration performance was measured. The results showed that the nanofiber membrane prepared with HBP-HTC has more dendritic structures than the membrance prepared with small molecule quaternary ammonium salts due to the abundant quaternary ammonium groups on the surface of HBP-HTC, which has a stable enrichment effect on charge. When the mass fraction of PVDF was 12%, the quaternary ammonium groups was 0.1 mol/L, and the spinning voltage was 25 kV, the dendritic coverage of the fabricated fiber membranes was as high as 78.32% and demonstrated good mechanical properties. The filtration efficiency of the prepared nanofiber membrane reached 99.995% at the thickness of 40 μm, while the pressure drop is 122.4 Pa.

Key words: hyperbranched quaternary ammonium salt, electrostatic spinning, polyvinylidene fluoride, dendritic nanofiber, filtering performance

CLC Number: 

  • TQ342

Fig.1

Dendritic cover measurement treatment map"

Fig.2

Schematic diagram of preparation of electrospun PVDF dendritic nanofiber membrane"

Fig.3

SEM image of PVDF nanofiber membrane after adding different quaternary ammonium salts"

Tab.1

Effect of different quaternary ammonium salts on electrical conductivity of spinning solution and dendritic coverage of fiber membrane"

盐的种类 电导率/(mS·m-1) 覆盖率/%
— 5.95 0.00
TBAC 140.80 45.87
HBP-HTC 178.72 78.32

Tab.2

Effect of different HBP-HTC addition amount on electrical conductivity and viscosity of spinning solution"

HBP-HTC浓度/(mol·L-1) 电导率/(mS·m-1) 黏度/(Pa·s)
0 5.95 1.26
0.05 116.34 1.40
0.10 178.72 1.69
0.15 196.76 1.77

Fig.4

SEM images and fiber diameter distribution of PVDF nanofiber membranes prepared with different HBP-HTC concentration"

Fig.5

SEM images of PVDF nanofiber membranes prepared at different spinning voltages"

Fig.6

Stress-strain curves of PVDF nanofiber membranes prepared with different HBP-HTC additions"

Tab.3

Air filtration performance of PVDF fiber membranes prepared with different HBP-HTC concentration"

HBP-HTC浓度/
(mol·L-1)		 过滤效
率/%		 压降/
Pa		 品质因数/
Pa-1
0 88.360 47.9 0.045
0.05 99.703 104.9 0.055
0.10 99.995 122.4 0.081
0.15 99.930 113.5 0.064

Fig.7

Air filtration performance of PVDF nanofiber membranes of different thickness. (a)Filtration efficiency and pressure drop;(b)Quality factor"

Tab.4

Comparison of filtration efficiency and pressure drop between HTP-HTC/PVDF nanofiber membranes and other electrostatic spinning nanofiber membranes for 0.26 μm NaCl aerosol"

纤维膜原料 树枝化
结构		 过滤效
率/%		 压降/
Pa		 文献
聚酰亚胺 无 99.990 251.9 [19]
聚丙烯腈 无 99.560 270.0 [20]
聚乳酸 无 99.964 197.9 [21]
聚苯乙烯/碳纳米管 无 99.680 235.4 [22]
超支化季铵盐/
聚偏氟乙烯		 有 99.995 122.4 本文研究
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