Appearance and development of polyconjugated structures in heat treatment of polyacrylonitrile fibres

Varshavskii, V. Ya.

doi:10.1007/bf00550782

Cited by 2 publications

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“…Since the EPR signals of zero-valence metals are registered in a range close to the g -factor of the free electron and they are similar to the signals of polyconjugated polymers (the triple CN bond of acrylonitrile can be polymerized under certain conditions forming double-chain conjugate polymers), , it is necessary to exclude or determine the contributions of the latter into the narrow signals of nanocomposites. To check this, the copolymer VT–AN of composition 11:89 with high content of acrylonitrile obtained at a high-temperature regime up to 573 K during 1.5 h is used.…”

Section: Resultsmentioning

confidence: 99%

Formation of Stable Paramagnetic Nanocomposites Containing Zero-Valence Silver and Copper in a Polymeric Matrix

et al. 2014

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Magnetic properties of perspective nanocomposite materials based on copolymers of 1-vinyl-1,2,4-triazole with acrylonitrile and the formation of zero-valence metallic magnetic nanoparticles were investigated by electron paramagnetic resonance (EPR). In the EPR spectra of the nanocomposites intensive narrow singlets of conducting electrons with g = 2.00 were observed. The shape and width of the signals for silver and copper particles of the nanocomposites depended on microwave power. The Curie law character of the temperature dependences of intensity, g-factor value, and width of silver and copper nanoparticles' signals were determined. Paramagnetic properties of the nanocomposites were found to remain constant over a long amount of time. X-ray diffraction (XRD), scanning electron microscope (SEM), teraohmmeter measurements, and atomic absorption analysis were also used to characterize these nanocomposites. The formation of the silver and copper nanoparticles from the rise of small clusters and their growth up to stabilization within the matrix under thermoreduction of initial complexes was monitored by EPR.

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Section: Resultsmentioning

confidence: 99%