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Morphology, structure, and segmental dynamics in polyazomethine/hybrid carbon nanofillers composites
Author(s) -
Bronnikov Sergei,
Kostromin Sergei,
Asandulesa Mihai,
Podshivalov Aleksandr,
Timpu Daniel
Publication year - 2019
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.25331
Subject(s) - materials science , composite material , nanocomposite , differential scanning calorimetry , carbon nanotube , graphene , glass transition , dielectric , polymer , relaxation (psychology) , scanning electron microscope , dielectric loss , nanotechnology , psychology , social psychology , physics , optoelectronics , thermodynamics
The polyazomethine/hybrid carbon nanofillers composites were fabricated. The nanofilles were comprised of thermally reduced graphene oxide (rGO) and multi‐walled carbon nanotubes (MWCNTs) varying in rGO:MWCNTs ratio; the total nanofillers loading was 1 wt%. The scanning electron miscroscopy images revealed uniform distribution of the hybrid nanofillers and formation of 3D networks between rGO and MWCNTs. Molecular dynamics of the polymer chains in these nanocomposites was investigated with broadband dielectric spectroscopy. The polymer fragility, the dielectric glass transition temperature, and the dielectric relaxation strength of the nanocomposites were evaluated and analyzed depending on the rGO:MWCNTs ratio. The thermal glass transition temperature and the thermal relaxation strength evaluated from the differential scanning calorimetry data were shown to behave in other manner. This behavior was interpreted in terms of a fraction of polymer being immobilized in an interfacial layer around the nanoparticles.