Open AccessTemperature-dependent rigidity and magnetism of polyamide 6 nanocomposites based on nanocrystalline Fe-Ni alloy of various geometries
Author(s) -
M. A. Mohamed,
Diego Pedrazzoli,
Norhan Nady,
Kyriaki Kalaitzidou
Publication year - 2016
Publication title -
express polymer letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.695
H-Index - 72
ISSN - 1788-618X
DOI - 10.3144/expresspolymlett.2016.77
Subject(s) - materials science , superparamagnetism , nanomaterials , nanocrystalline material , spintronics , magnetism , ferromagnetism , nanocomposite , nanotechnology , magnetoresistance , maghemite , magnetic nanoparticles , alloy , nanoparticle , magnetization , condensed matter physics , metallurgy , magnetic field , quantum mechanics , physics
The focus of this study is to explore the potential use of Polyamide 6 nanocomposite reinforced with nanocrystalline (nc) Fe20Ni80 alloy (Fe20Ni80/PA6 PNC) in electromagnetic applications and provide understanding of how the alloy particle geometry is controlling the nanocomposite’s physical properties. Thermomechanical rigidity, room-temperature soft magnetic performance and thermal soft magnetic stability of Fe20Ni80/PA6 PNCs based on spherical-sea urchin alloy particles (UMB2-SU) and necklace-like alloy chains (UMB2-NC) have been investigated. Both PNCs have considerably superior bulk properties compared to neat PA6 and UMB2-SU exhibits the most remarkable overall performance. Morphological observations disclose two relevant phenomena: i) improved dispersion and distribution of the SU alloy particles than the NC ones within PA6 matrix, leading to stronger filler-matrix interfacial interactions within the UMB2-SU as compared to the UMB2-NC and ii) presence of constraint polymer regions in between alloy segments within the UMB2-SU that provide secondary reinforcing and soft magnetic mechanisms. Such phenomena along with the lower alloy crystallite size and PA6 γ-crystal type content within the UMB2-SU than in the UMB2-NC, are considered the main responsible factors for the distinctive performance of UMB2-SU. Overall, compared to various ferromagnetic nanocrystalline metallic materials, the research proposes the SU nc Fe20Ni80 alloy as a valuable nanofiller in polymers for electromagnetic applications