Preparation of Electrosprayed, Microporous Particle Filled Layers.

Mohanapriya Venkataraman,Xiaoman Xiong,Yan Wang,Jiri Militky,Kai Yang,Guoqing Zhang,Dana Kremenakova,Guocheng Zhu,Juming Yao

doi:10.3390/polym12061352

Mohanapriya Venkataraman, Xiaoman Xiong + Show 7 more

Open Access

https://doi.org/10.3390/polym12061352

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Abstract

Polytetrafluoroethylene (PTFE) is a synthetic fluoropolymer known for its excellent hydrophobic properties. In this work, samples from PTFE dispersions with different combinations of water and carbon microparticles were prepared using an electrospraying method. The morphologies and sizes of carbon particles were investigated and the properties of layers including roughness, hydrophobicity and electrical resistivity were investigated. The non-conductive carbon microparticles were selected as a model particle to check the compatibility and electrospraying ability, and it had no effect on the hydrophobic and electrical properties. Carbon microparticles in polymer solution increased the degree of ionization and was found to be beneficial for the shape control of materials. The results showed that PTFE dispersion with the composition of water and carbon microparticles produced fine sphere particles and the layer fabricated with increased roughness. It was also found that the electrical resistivity and hydrophobicity of all the layers comparatively increased. The fabricated microporous layers can be used in various applications like interlining layer in multilayer textile sandwiches.

Highlights

Polytetrafluoroethylene (PTFE) is a synthetic fluoropolymer with repeated units [(−CF2 −)n ], where the inner strongly bonded fluorine atoms make it a high molecular weight compound characterized with semi-crystalline nature, and a strong C-F bond prevents reaction between other chemicals and PTFE [1]
Electrosprayed layers were fabricated from optimized concentration of the solution via Electrosprayed layers were fabricated from optimized concentration of the solution via electrospraying using the Nanospider instrument
PTFE particles containing carbon microparticles appear in the form of spheres and tend to be smaller with dilution of the PTFE solution

Summary

Introduction

Polytetrafluoroethylene (PTFE) is a synthetic fluoropolymer with repeated units [(−CF2 −)n ], where the inner strongly bonded fluorine atoms make it a high molecular weight compound characterized with semi-crystalline nature, and a strong C-F bond prevents reaction between other chemicals and PTFE [1]. PTFE is known for its excellent hydrophobic, dielectric, mechanical and thermal properties [2] It is widely used in films, coating materials and fibers in industry domains such as polymeric gears [3], cables [4], implants [5], textiles [6] and so on. Casting PTFE polymer in sphere or PTFE particles via common methods such as molding, emulsion [7], suspension polymerization [8], etc., is very difficult. This is due to the inhomogeneous particle fabrication and a restricted number of processable polymers that cannot be avoided technically.

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