Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (04): 40-46.doi: 10.13475/j.fzxb.20210403107

• Fiber Materials • Previous Articles     Next Articles

Preparation and performance of polyurethane/polydimethylsiloxane waterproof and moisture permeable membrane with star like topological geometry structure

SUN Zheru, ZHANG Qingle, HAO Lincong, CHENG Lu, XIA Xin()   

  1. College of Textile and Clothing, Xinjiang University, Urumqi, Xinjiang 830046, China
  • Received:2021-04-12 Revised:2021-11-14 Online:2022-04-15 Published:2022-04-20
  • Contact: XIA Xin E-mail:xjxiaxin@163.com

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Abstract:

In order to study the waterproof properties of nanofiber membranes and explore the mechanism of the influence of the microstructure of the membrane surface on the membrane properties, polyure-thane(PU)/polydimethylsiloxane(PDMS) nanofiber membranes were prepared by electrospinning method with high spinning PU and fluorinated low surface energy PDMS as raw materials. The PU/PDMS particles were deposited by electrostatic spray on the fiber membrane substrate, leading to the creation of an environment-friendly waterproof and moisture permeable membrane. The morphology, waterproof properties, air and moisture permeability and mechanical properties were tested and analyzed. The results showed that the superfine fiber links formed by electrostatic spray formed a star like topological structure, and formed a stable membrane structure with the PU/PDMS nanofiber substrate, with improved waterproof and mechanical properties. When the electrostatic spraying PU/PDMS mass fraction is 6% and the time is 2 h, the nanofiber membrane shows the best water repellency. Under this conditions, the static contact angle of the water reaches 149.1°, the moisture permeability is 5 566.7 g/(m2·d), the air permeability is 11.50 mm/s, the breaking strength is 8.22 MPa, and the elongation at break is 247.1%.

Key words: electrospinning, electrostatic spray, star like topological geometry structure, waterproof and moisture permeable membrane, polyurethane, polydimethylsiloxane

CLC Number: 

  • TS174.8

Fig.1

Schematic illustration of fabrication process of PU/PMDS waterproof and moisture permeable membrane"

Tab.1

Parameter of electrostatic spray solution"

样品编号 PU/PDMS质量
分数/%		 静电喷
雾时间/h
0# 0 0
1#
3		 1
2# 2
3# 3
4# 6 1
5# 2
6# 3
7# 9 1
8# 2
9# 3

Fig.2

SEM image of PU/PDMS nanofibers without electrostatic spray treatment"

Fig.3

SEM images of PU/PDMS waterproof and moisture permeable membranes after electrostatic spray"

Fig.4

SEM images of microstructure obtained from different concentrations of liquid 2 and its model diagram"

Fig.5

Water contact angle of PU/PDMS waterproof and moisture permeable membrane"

Fig.6

Infiltration model of PU/PDMS waterproof and moisture permeable membrane"

Fig.7

Dynamic test process of water droplets on surface of waterproof and moisture permeable membrane"

Fig.8

Waterproof performance of PU/PMDS waterproof and moisture permeable membrane"

Tab.2

Water vapor transmittance rate and air permeability of PU/PMDS waterproof and moisture permeable membrane"

样品编号 透湿率/
(g·(m2·d)-1)		 透气率/
(mm·s-1)
0# 7 533.3 30.91
1# 7 266.7 21.59
2# 6 833.1 13.44
3# 6 266.7 11.23
4# 6 466.7 18.88
5# 5 566.7 11.50
6# 4 733.3 10.89
7# 5 966.7 14.68
8# 4 633.3 10.65
9# 4 533.3 10.22

Tab.3

Mechanical properties of PU/PMDS waterproof and moisture permeable membrane"

样品编号 断裂强度/MPa 断裂伸长率/%
0# 7.37 291.4
1# 7.63 269.6
2# 7.91 263.2
3# 8.20 260.9
4# 8.13 248.5
5# 8.22 247.1
6# 8.30 244.3
7# 8.71 239.5
8# 8.92 235.6
9# 9.23 233.7
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