Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (05): 25-29.doi: 10.13475/j.fzxb.20190708005

• Fiber Materials • Previous Articles     Next Articles

Fabrication and properties of amidoxime-modified SiO2/polyacrylonitrile composite fibrous nonwovens

ZHANG Yimin1,2, ZHOU Weitao1,3, HE Jianxin1,2, DU Shan3, CHEN Xiangxiang1,2, CUI Shizhong1,2   

  1. 1. Hennan Key Laboratory of Functional Textile Materials, Zhongyuan University of Technology, Zhengzhou, Henan451191, China
    2. Institute of Textile and Garment Industry, Zhongyuan University of Technology, Zhengzhou, Henan 451191, China
    3. Collaborative Innovation Center of Textile and Garment Industry, Zhengzhou, Henan 451191, China
  • Received:2019-07-31 Revised:2020-02-14 Online:2020-05-15 Published:2020-06-02

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Abstract:

In order to construct membrane materials with special surface/interface properties, amidoxime-modified SiO2/polyacrylonitrile(PAN)nonwovens with highly hydrophilic and underwater super-hydrophobic surface were fabricated using electrospinning and amidoximation with hydroxylamine hydrochloride. The composite nonwovens were characterized by the field emission scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier transform infrared spectrometer and contact angle tester. The results show that the surfaces of the amidoxime-modified nanofibrous nonwovens are covered with floccule, the average diameters of amidoxime-modified SiO2/PAN nonwovens are 275 nm at the optimal volume concentration of 35-40 g/L and the best modification temperature is 60 ℃. The fraction content of Si and O elements on the surface of the modified nanofibrous nonwovens are 2.13% and 6.60%, receptively. All these results demonstrate that SiO2 particles are successfully deposited onto the PAN nonwovens. Comparing with PAN nonwovens (wetting time 5.4 s), after 60 ℃ amidoximation, the wetting time of SiO2/PAN nonwovens is shortened to 0.5 s. Moreover, the underwater oil contact angle of as-prepared composited nonwovens reach (165.2±1)°. The breaking strength of amidoxime-modified nanofibrous nonwovens is 4.1 MPa,and it meet the basic requirements of oil-water separation.

Key words: amidoximation, SiO2, polyacrylonitrile, electrospraying, nanofiber, oil-water separartion, hydrophilic and oleophobic

CLC Number: 

  • TQ031.7

Fig.1

SEM images of PAN and SiO2/PAN membrane(×10 000)"

Fig.2

SEM images of amidoxime-modified SiO2/PAN membrane with different mass concentration of hydroxylamine hydrochloride(×10 000)"

Fig.3

SEM (a) and EDS (b) diagrams of amidoxime modified SiO2/PAN membrane"

Fig.4

FT-IR spectra of amidoxime-modified SiO2/PAN membrane"

Tab.1

Effect of temperature on osmotic time and underwater oil contact angle of membrane"

反应温度/℃ 渗透时间/s 水下油接触角/(°)
30 3.2 146.5±2
45 1.8 151.9±2
60 0.5 165.2±1
75 4.9 143.2±2

Fig.5

Stress-strain curves of nanofibrous membrane before and after modification"

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