Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (04): 62-68.doi: 10.13475/j.fzxb.20200803907

• Fiber Materials • Previous Articles     Next Articles

Preparation and pressure sensitivity of conductive polyaniline/polyurethane foam

ZHOU Xinru1, ZHOU Xiaoya1, MA Yongjian1, HU Chengye1, ZHAO Xiaoman1,2, HONG Jianhan1,2, HAN Xiao1,2()   

  1. 1. College of Textile and Garment, Shaoxing University, Shaoxing, Zhejiang 312000, China
    2. Key Laboratory of Clean Dyeing and Finishing Technology of Zhejiang Province, Shaoxing, Zhejiang 312000, China
  • Received:2020-08-07 Revised:2021-01-14 Online:2021-04-15 Published:2021-04-20
  • Contact: HAN Xiao E-mail:hanxiao@usx.edu.cn

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Abstract:

In order to prepare pressure-sensitive materials with good resilience and sensing properties, a conductive polyaniline/polyurethane foam was prepared by in-situ polymerization using high elastic porous polyurethane foam as substrate. The structure and properties of conductive polyaniline/polyurethane foam were studied. The pressure sensitivity of the conductive polyaniline/polyurethane foam under different compressive strains were analyzed and used for monitoring human motion. The results show that polyaniline is attached to the surface and internal gap of the polyurethane foam, demonstrating good electrical conductivity, and the resistivity decreased to 1.214×103 Ω·cm. Compared with the polyurethane foam before treatment, the elastic modulus and maximum load of the conductive polyaniline/polyurethane foam are reduced. The pressure sensor prepared from the conductive polyaniline/polyurethane foam has good sensing performance. It exhibits good linearity, sensitivity and repeatability at 30% and 50% compression rate, but the sensing performance at 80% compression rate decreases. Jogging monitoring shows that the pressure sensor is able to monitor human movement.

Key words: polyurethane foam, in-situ polymerization, polyaniline, pressure sensor, movement monitoring

CLC Number: 

  • TQ317

Fig.1

Appearance of PUF (a) and PANI/PUF (b)"

Fig.2

Resistance testing method of PANI/PUF"

Fig.3

Schematic diagram of mechanical property test fixture after modification"

Fig.4

Testing system for pressure sensitive sensing"

Fig.5

Schematic diagram of PANI/PUF pressure sensitive sensor (a) and human movement monitoring (b)"

Fig.6

Surface morphology of PUF and PANI/PUF (×700)"

Fig.7

Mechanical curves of PUF and PANI/PUF"

Fig.8

Compression (a) and maximum load (b) of PUF and PANI/PUF in different cycle"

Fig.9

Resistance variation of PANI/PUF under different compression ratio"

Fig.10

Structural model of PANI/PUF under relaxed (a) and compressed (b) state"

Tab.1

Linear fitting equations"

压缩率/% 拟合方程 相关系数r
30 y=-0.684 1x + 1.031 9 0.981
50 y=-0.351 7x + 3.225 9 0.941
80 y=-0.323x + 4.697 3 0.802

Fig.11

Resistance variation of PANI/PUF under different compression ratio"

Fig.12

Change of resistance of sensor during jogging"

Tab.2

Interval between footsteps"

步数间隔 起始时间/s 结束时间/s 持续时间/s
8~10 4.76 5.96 1.20
10~12 5.96 7.08 1.12
12~14 7.08 8.16 1.08
14~16 8.16 9.34 1.18
16~18 9.34 10.44 1.10
18~20 10.44 11.60 1.16
20~22 11.60 12.76 1.16
22~24 12.76 13.86 1.10
24~26 13.86 14.86 1.00
26~28 14.86 16.18 1.32
平均值 1.142
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