Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (03): 71-76.doi: 10.13475/j.fzxb.20200805206

Special Issue: Preparation of Nano-fiber and Its Application

• Fiber Materials • Previous Articles     Next Articles

Preparation of SiO2 in-situ doped polyvinylidene fluoride nanofiber membrane and its properties

CHENG Yue1, AN Qi1, LI Dawei1,2, FU Yijun1,2(), ZHANG Wei1,2, ZHANG Yu1,2   

  1. 1. College of Textile and Clothing, Nantong University, Nantong, Jiangsu 226019, China
    2. National & Local Joint Engineering Research Center of Technical Fiber Composites for Safety and Health, Nantong University, Nantong, Jiangsu 226019, China
  • Received:2020-08-10 Revised:2020-12-15 Online:2021-03-15 Published:2021-03-17
  • Contact: FU Yijun E-mail:fuyj@ntu.edu.cn

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Abstract:

To improve the piezoelectric properties of polyvinylidene fluoride (PVDF), silicon dioxide (SiO2) in-situ doped PVDF composite nano fiber membranes were prepared via the sol-gel method and high-voltage electrospinning technology with PVDF and ethylsilicate (TEOS) as raw materials, N, N-dimethyl formamide (DMF) and acetone as mixed solvent. Surface micromorphology, chemical composition, mechanical and piezoelectric properties of the nanofiber membranes were compared and analyzed. Results show that the mass and thickness of composite nanofiber membranes ascended with the increase of TEOS. Electrospinning converted part of the α phase in PVDF to β phase, and the β phase content of pure PVDF nanofiber membrane was (31.42±0.62)%, which was 1.54 times higher than PVDF powder. Moreover, the content of β phase was further improved by in-situ doping of nano-SiO2, and peak value of (42.59±0.62)% was achieved when the mass of TEOS was 1.643 g. With the increase of nano-SiO2, both tensile force and output voltage of composite nanofiber membranes demonstrated an increase-decrease trend. In addition, when the mass of TEOS was 1.643 g, SiO2 in-situ doped PVDF nanofiber membrane exhibited the highest tensile strength and output voltage, which were (8.03±0.19) N, and (2.33±0.13) V, respectively.

Key words: in-situ composite, sol-gel, electrospinning, nanofiber membrane, piezoelectric property, polyvinylidene fluoride, organic piezoelectric material

CLC Number: 

  • TS102.6

Tab.1

Design of experimental scheme"

试样编号 质量/g
TEOS PVDF DMF 丙酮
1# 0.000 1.110 6 4
2# 0.400 1.126 6 4
3# 0.802 1.136 6 4
4# 1.219 1.149 6 4
5# 1.643 1.163 6 4
6# 2.078 1.176 6 4

Fig.1

SEM images of different nanofiber membranes(×10 000)"

Tab.2

Surface density and thickness of different nanofiber films"

试样编号 面密度/(g·m-2) 厚度/mm
1# 0.030 8±0.005 1 0.181 0±0.175 0
2# 0.033 0±0.005 2 0.184 7±0.022 0
3# 0.040 4±0.006 8 0.244 3±0.016 3
4# 0.048 7±0.007 6 0.285 0±0.006 0
5# 0.049 1±0.004 7 0.291 2±0.005 4
6# 0.069 1±0.002 0 0.311 8±0.014 4

Fig.2

FT-IR spectra of PVDF power and different nanofiber membranes"

Fig.3

β phase content of PVDF powder and different nanofiber membrane"

Fig.4

Tensile strength of different nanofiber membrane"

Fig.5

Output voltage of different nanofiber membrane"

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