Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (12): 42-42.doi: 10.13475/j.fzxb.20210201807

• Fiber Materials • Previous Articles     Next Articles

Preparation and properties of thermoplastic polyurethane/tefluororone amorphous fluoropolymer superhydrophobic nanofiber membranes

XU Shilin1,2, YANG Shiyu3, ZHANG Yaru1,2, HU Liu1,2, HU Yi1,2()   

  1. 1. Key Laboratory of Advanced Textile Materials & Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
    2. Engineering Research Center for Eco-Dying and Finishing of Textiles,Ministry of Education, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
    3. Zhejiang Technology Lixin Materials Co., Ltd., Shaoxing, Zhejiang 312030, China
  • Received:2021-02-05 Revised:2021-09-07 Online:2021-12-15 Published:2021-12-29
  • Contact: HU Yi E-mail:huyi-v@zstu.edu.cn

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Abstract:

Aiming at the problems of low mechanical properties and poor-hydrophobicity of nanofiber membrane, thermoplastic polyurethane (TPU) nanofiber membrane was prepared by electrospinning,and the TPU/tefluororone amorphous fluoropolymer (Teflon AF) superhydrophobic nanofiber membrane was obtained by impregnating in Teflon AF solution. The influence of immersion concentration and dipping time on the hydrophobicity and mechanical properties of the nanofiber membranes were analyzed by scanning electron microscope, electronic universal tester, and video contact angle tensiometer. The results show that when the mass fraction of Teflon AF is increased to 6%, the water contact angle of the nanofiber membrane reaches 150°, and the oil contact angle becomes lower than 3°, showing a superhydrophobicity. The mechanical strength of the nanofiber membrane were not affected by the impregnation, and the modulus of elasticity displayed an increase to 5.09 Pa. The nanofiber membrane implies good potential application value in filter media and biomedical fields.

Key words: electrospinning, thermoplastic polyurethane, tefluororone amorphous fluoropolymer, superhydrophobic nanofiber, self-cleaning material, filter material

CLC Number: 

  • TQ340.64

Tab.1

Preparation scheme for nanofiber film of TPU/Teflon AF"

样品编号 特氟龙AF溶液质量分数/% 浸渍时间/h
1# 0.0 0
2# 2.0 2
3# 6.0 2
4# 10.0 2
5# 2.0 6
6# 6.0 6
7# 10.0 6
8# 2.0 12
9# 6.0 12
10# 10.0 12

Fig.1

SEM images of TPU nanofiber membranes before and after impregnated in Teflon AF solution"

Tab.2

Hydrophobic/lipophilic characteristics of nanofiber membrane with different immersion concentration and time(°)"

样品编号 水接触角 水滚动角 油接触角
1# 38.6 — 1.3
2# 126.9 6.0 1.2
3# 136.0 4.0 1.3
4# 141.6 4.0 2.2
5# 140.5 5.0 1.5
6# 146.0 5.0 1.6
7# 150.2 4.0 1.7
8# 150.4 4.0 1.4
9# 150.5 4.0 1.3
10# 156.5 4.0 1.3

Tab.3

Surface tension of two typical liquid"

液体 γL/(mJ·m-1) γ L D/(mJ·m-1) γ L p/(mJ·m-1) 性质
蒸馏水 72.8 21.8 51 极性
二碘甲烷 50.8 50.8 0 非极性

Fig.2

Water and diiodomethane contact angle of TPU nanofiber membrane before and after impregnated in Teflon AF solution. (a) 1# water contact angle;(b) 9# water contact angle;(c) 1# diiodomethane contact angle;(d) 9# diiodomethane contact angle"

Fig.3

Dynamic behavior of water droplets falling on surface of TPU/Teflon AF nanofiber membranes. (a) Water droplets falling on surface of nanofiber membrane;(b) Water droplets contact surface of nanofiber membrane;(c) Water droplets bounce from surface of fiber membrane;(d) Water droplets rest on fibrous membrane surface"

Fig.4

Surface image of TPU/Teflon AF nanofiber membrane subjected to water shooting from 45°"

Fig.5

Stress-strain curves of TPU nanofiber membrane before and after impregnated in Teflon AF solution"

Fig.6

Variation of permeability with nanofiber membrane thickness"

Fig.7

Changes of quality with time of TPU nanofiber membrane before and after impregnated in Teflon AF solution"

Fig.8

Water droplets remove dust from surface of nanofiber membrane"

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