Ultra-light weight, water durable and flexible highly electrical conductive polyurethane foam for superior electromagnet
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Ultra-light weight, water durable and flexible highly electrical conductive polyurethane foam for superior electromagnetic interference shielding materials Sabyasachi Ghosh1 · Sayan Ganguly1 · Sanjay Remanan1 · Subhadip Mondal1 · Subhodeep Jana2 · Pradip K. Maji3 · Nikhil Singha1 · Narayan Ch. Das1 Received: 24 October 2017 / Accepted: 5 April 2018 © Springer Science+Business Media, LLC, part of Springer Nature 2018
Abstract An inexpensive light weight radiation shielding materials have been fabricated by one step, facile technique avoiding toxic volatile organic solvents. Herein, we adopted ‘dip coating and drying’ method to prepare high surface area specialty conductive black (Ketjen-600JD) loaded polyurethane (PU) composite foam. The non-ionic surfactant stabilized black particles showed promising improvement in electrical conductivity (exceptionally low percolation threshold concentration) and water durability. The morphological analysis from electron microscopy and 3D micro computed tomography supports uniform conducting pathway formation on to the cell walls of the cellular PU system. The PU foam surprisingly showed no severe drop of porosity even after dipping in high carbon black dispersion. This efficiently supports the micro structural integrity of the foam composites which has been normally retained as the pristine foam. The EMI shielding value of the composite foam for only 2 wt% carbon black shows 65.6 dB which is amazingly high for other reported values till date. This can be said that the prepared conducting foam is suitable alternative for low cost durable EMI shielding material.
1 Introduction The flexible and lightweight materials recently gained attention due to the rapid growth in electronic devices. The polymer materials replace the conventional metallic counterparts provides excellent flexibility, light weight, strength, and corrosion resistance. Polymers are accustomed insulating nature limits their application in the conducting devices. But recent research in the conducting-polymer composites helps the generation of light weight electronic gadgets [1, 2]. The popularity of conducting polymer composites revolutionizes the Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10854-018-9068-2) contains supplementary material, which is available to authorized users. * Narayan Ch. Das [email protected] 1
Rubber Technology Centre, Indian Institute of Technology, Kharagpur 721302, India
2
Central Research Facility, Indian Institute of Technology, Kharagpur 721302, India
3
Department of Polymer & Process Engineering, Indian Institute of Technology, Roorkee 247001, India
electronics industry to make products ranging from wearable smart textiles to flexible mobile phones [3]. Electromagnetic interference (EMI) is the Achilles heel of electronic devices, especially in telecommunication and computer industries. Electromagnetic interference is the condition of the devices in which working of one electronic device is influenced by the
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