Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (02): 1-7.doi: 10.13475/j.fzxb.20180800307

• Fiber Materials •     Next Articles

Preparation and waterproof and moisture-permeable properties of electrospun polyurethane/silica composite superfine fiber membrane

ZHANG Qiong1, LIU Hanlin1, LI Pingping1, LI Ni1,2()   

  1. 1. Silk Institute,College of Materials and Textiles, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
    2. Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
  • Received:2018-08-01 Revised:2018-11-11 Online:2019-02-15 Published:2019-02-01
  • Contact: LI Ni E-mail:lini@zstu.edu.cn

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Abstract:

In order to prepare a superfine fiber membrane with waterproof and moisture-permeable properties, polyurethane/silica (PU/SiO2) membranes were prepared by electrospinning. The spinning solution was prepared by adding hydrophobic SiO2 to PU solution. The effects of spinning solution concentration and membranes thickness on the pore size of the membranes were analyzed by software simulation. The waterproof and moisture-permeable properties of the membranes were characterized by the water contact angle, hydrostatic pressure, air permeability and moisture permeability. The effects of different SiO2 concentrations on the waterproof and moisture-permeable properties of the PU/SiO2 composite superfine fiber membranes were studied. The results show that the pore size of membranes increase with the spinning solution concentrations, and decrease with the increase of the membranes thickness. When the concentration of SiO2 is 9% and that of PU is 18%, the composite membranes are endowed with the water contact angle of 131°, the hydrostatic pressure of 6.4 kPa, the air permeability of 33.4 mm/s and the moisture permeability up to 8.065 kg/(m2·d). Meantime, the broken stress of the PU/SiO2 composite membranes reaches 4.16 MPa, and the elongation at break reaches 184%. Therefore, the membranes have better dimensional stability than pure PU membranes.

Key words: polyurethane, silica, electrospinning, waterproof and moisture-permeable property

CLC Number: 

  • TS102.5

Fig.1

Pore size of PU membrane prepared with different mass fraction of PU"

Fig.2

3-D structure model of PU membrane prepared with different mass fraction of PU"

Fig.3

Pore size of PU membrane with different thicknesses"

Fig.4

Vertical view of 3-D structure model of PU membrane with different thicknesses"

Fig.5

SEM images of PU/SiO2 composite membranes"

Fig.6

TEM images of PU/SiO2 composite membranes"

Fig.7

FT-IR spectra of PU/SiO2 composite membranes prepared with different mass fraction of SiO2"

Tab.1

Pore size and porosity of PU/SiO2 composite membranes prepared with different mass fraction of SiO2"

SiO2质量分数量/% 平均孔径/μm 最大孔径/μm 孔隙率/%
0 2.273 28.256 54.20
3 2.435 41.257 53.90
6 4.218 42.850 52.70
9 3.031 35.868 52.10
12 3.423 39.714 51.03

Tab.2

Mechanical properties of PU/SiO2 composite membranes prepared with different mass fraction of SiO2"

SiO2质量
分数/%		 断裂应
力/MPa		 断裂伸长
率/%		 初始模
量/MPa
0 6.15 238 14.72
3 5.70 216 14.53
6 4.54 203 13.62
9 4.16 184 13.61
12 3.10 162 14.21

Tab.3

Water contact angle and hydrostatic pressure of PU/SiO2 composite membranes parepared with different mass fraction of SiO2"

SiO2质量分数/% 静态水接触角/(°) 静水压/kPa
0 125 1.4
3 127 3.2
6 129 5.1
9 131 6.4
12 130 7.6

Fig.8

Air permeability and WWVT of PU/SiO2 composite membranes prepared with different mass fraction of SiO2"

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