Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (09): 17-23.doi: 10.13475/j.fzxb.20210201708

• Invited Column:Intelligent fiber and products • Previous Articles     Next Articles

Thermo-sensitive hydrophilic-hydrophobic transition and moisture permeability of poly-N-isopropylacrylamide/polyurethane gradient composite membrane

YANG Qun1,2,3(), LIANG Qi1, WANG Liming1, DAI Zhengwei3   

  1. 1. School of Textiles and Fashion, Shanghai University of Engineering Science, Shanghai 201620, China
    2. Shanghai Engineering Research Center for Clean Production of Textile Chemistry, Shanghai 201620, China
    3. Zhejiang Provincial Key Laboratory of Yarn Material Forming and Compound Processing Technology Research, Jiaxing, Zhejiang 314001, China
  • Received:2021-02-05 Revised:2021-06-06 Online:2021-09-15 Published:2021-09-27

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Abstract:

To improve the temperature-sensitivity and moisture permeability of intelligent waterproof and moisture permeable membrane, poly-N-isopropylacrylamide (PNIPAM) was coated on hierarchical pore polyurethane (PU) membranes and PNIPAM/PU gradient composite membranes were prepared by adjusting the mass fraction of PNIPAM. Structure, thermo-sensitive hydrophilic-hydrophobic and thermo-sensitive moisture permeability were investigated. The results show that the construction of PNIPAM does not change the hierarchical pore structure. It has thermo-sensitive hydrophilic-hydrophobic transition properties, exhibiting hydrophilicity when temperature below the transition temperature (30 ℃), and hydrophobicity when temperature above this temperature. Meanwhile, the introduction of PNIPAM improves thermo-sensitive moisture permeability, from 4 843.4 g/(m2·24 h) of PU to 6 398.3 g/(m2·24 h) of PNIPAM/PU gradient composite membrane at 50 ℃ when mass fraction of PNIPAM is 6%. It was also found that the higher the content of PNIPAM, the more significant decrease in swelling property with the temperature increase.

Key words: hierarchical pore, gradient membrane, thermo-sensitive, hydrophilic-hydrophobic transition, moisture permeability, functional textile material

CLC Number: 

  • TB381

Fig.1

SEM images of PU gradient membrane. (a) Skin surface; (b) Bottom surface; (c) Cross section surface"

Fig.2

Cross section SEM images of PNIPAM/PU gradient composite membrane with different mass fraction of PNIPAM"

Fig.3

FT-IR spectra of PU gradient membrane, PNIPAM and PNIPAM/PU gradient composite membrane"

Fig.4

Swelling of PU gradient membrane and PNIPAM/PU gradient composite membrane varied with temperature"

Fig.5

Changes of contact angle of PU gradient membrane and PNIPAM/PU gradient composite membranes with time"

Fig.6

Shape of water drop varied with time on PNIPAM/PU gradient composite membraneat 25 and 60 ℃"

Fig.7

Permeability of PNIPAM/PU gradient composite membrane at different temperature varied with time"

Tab.1

Moisture permeability of PNIPAM/PU gradient composite membrane"

温度/℃ 透湿率/(g·m-2·(24 h)-1)
PU梯度膜 PNIPAM/PU梯度复合膜
25 210 150
50 4 843.4 6 398.3

Fig.8

Thermal stability of PU gradient membrane, PNIPAM and PNIPAM/PU gradient composite membrane. (a) TGA curve; (b) DTG curve"

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