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Single walled carbon nano tube ‐Polyaniline core‐shell/polyurethane polymer composite for electromagnetic interference shielding
Author(s) -
Avadhanam Vanaja,
Thanasamy David,
Kiran Mathad Jyotsna,
Tumuki Padmavathi
Publication year - 2018
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.24474
Subject(s) - materials science , composite material , polyurethane , polyaniline , composite number , percolation threshold , carbon nanotube , coating , polymer , nanocomposite , electrical resistivity and conductivity , polymerization , engineering , electrical engineering
Single Walled Carbon Nanotube‐Polyaniline core‐shell/polyurethane polymer composites (SWCNT‐PANI/PU) were prepared by a two‐step process. Initially, SWCNT‐PANI core‐shell was synthesized by in‐situ chemical oxidation. Later, polyurethane polymer composites were prepared by dispersing varying percentages of SWCNT‐PANI core‐shell as a filler into polyurethane. These composites exhibited a percolation threshold at 0.1 wt% filler loading. Percolation theory was applied to estimate the exact percolation threshold of composites. Maximum electrical conductivity 6.28 × 10 −4 S cm −1 was realized at 3 wt% of filler loading. The enhancement of electrical conductivity was substantiated by FTIR, FESEM, XRD, and TGA. These results confirmed the interaction between SWCNT‐PANI core‐shell and polyurethane that was responsible for the enhanced electrical conductivity. Further, these polymer composites, as coatings were applied on to the GFRP substrates for evaluating the EMI shielding effectiveness. The coating properties viz. adhesion, scratch resistance and hardness were evaluated according to ASTM procedures and the EMI shielding effectiveness (EMISE) of the polymer composite in X‐band (8–12 GHz) and W‐band (75–110 GHz) frequencies was assessed by dielectric probe and free space methods respectively. Maximum EMISE of 11 dB in X‐band and 10 dB in W‐band was realized for 3 wt% SWCNT‐PANI core‐shell loaded PU polymer composite coating. POLYM. COMPOS., 39:4104–4114, 2018. © 2017 Society of Plastics Engineers