A Facile Approach for Preparing Ag Functionalized Nonwoven Polypropylene Membrane to Improve Its Electrical Conductivity and Electromagnetic Shielding Performance.

Dongfeng Shao,Kan Cao,Qufu Wei,Hongwei Zhang,Lizhen Tao

doi:10.3390/ma12020296

Abstract

The commonly used preparation methods of polypropylene functionalization require special equipment to be put into use or take a long time, which limits its application. Therefore, a simple and economical method for preparing silver functionalized nonwoven polypropylene membrane was studied herein. Triethanolamine was first coated on the surface of the polypropylene, and then Ag was deposited on the surface of polypropylene using a continuous reduction reaction of triethanolamine and silver ions. Surface morphology, crystal structure, and surface chemistry during the preparation of Ag functionalized nonwoven polypropylene were investigated. The electrical conductivity, electromagnetic shielding properties, and washing durability of the treated nonwoven polypropylene were also studied. It was found that Ag was uniformly deposited on the surface of the nonwoven polypropylene, and the coating reaction did not change the chemical structure of the polypropylene. The crystallinity and thermal stability of polypropylene were improved after silver coated polypropylene. The washing experiment results showed that the weight gain rate of the treated nonwoven relative to the untreated sample after the 90 min washing ranged from 6.72% to 9.64%. The resistance test results showed that the maximum surface resistivity of Ag coated nonwoven polypropylene was about 1.95 × 105 Ω, which was 64,615 times lower than the original. In addition, the results showed that the maximum electromagnetic shielding effectiveness of the Ag coated nonwoven polypropylene was about 71.6 dB, showing a very good electromagnetic shielding effect.

Highlights

In recent years, with the rapid improvement of electronic technology and artificial intelligence, more and more electronic products are being used, and electromagnetic radiation generated by electronic products has caused widespread concern, which resulted in an increase in demand for conductive textiles and electromagnetic shielding textiles
Except for the diffraction peaks of nonwoven polypropylene, such as 2θ = 14.0◦, 16.9◦, 18.4◦, and 21.8◦, the other peaks at 2θ = 38.0◦, 44.2◦, 64.4◦, and 77.4◦ correspond to the (110), (200), (220), and (311) crystal plane of Ag [16]. These results indicate that the first half of the Ag coating process had deposited silver on the surface of the nonwoven polypropylene
The results of FT-IR indicated that Ag deposition on the surface of polypropylene did not change the chemical structure of polypropylene

Summary

Introduction

With the rapid improvement of electronic technology and artificial intelligence, more and more electronic products are being used, and electromagnetic radiation generated by electronic products has caused widespread concern, which resulted in an increase in demand for conductive textiles and electromagnetic shielding textiles. Different methods have been used to improve the electrical conductivity and electromagnetic radiation resistance of textiles, such as embedded conductive fibers [1] or conductive yarns [2] in fabrics, and coated conductive layers on the surface of fabrics [3]. These methods improved the electrical conductivity of textiles while achieving electromagnetic shielding of textiles by absorbing or reflecting electromagnetic waves [4]. Ozenet et al [6] reported that the shielding effect of nonwoven made of 6.7 dtex and

Methods

Results

Conclusion