Kazan Federal University Digital Repository

Real time dielectric monitoring of glass transition in n-vinyl pyrrolidone polymerization

Show simple item record

dc.contributor.author Salehli F.
dc.contributor.author Bayrak I.
dc.contributor.author Nigmatullin R.
dc.contributor.author Arbuzov A.
dc.date.accessioned 2018-09-18T20:05:24Z
dc.date.available 2018-09-18T20:05:24Z
dc.date.issued 2007
dc.identifier.issn 0022-3093
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/136405
dc.description.abstract Real time dielectric spectroscopy was used for monitoring the dynamics during liquid glass transition in radical bulk polymerization of n-vinyl pyrrolidone. Two different relaxation mechanisms were identified. Initially segmental α-relaxation was dominant. Subsequently, contribution from slower motions became more significant and ε′(tr, ω) underwent maxima in all frequency bands up to 10 MHz. Peak amplitude increased and the occurring time was delayed with decreasing frequency. The slow region dynamics were similar to the dynamics of Chamberlin's domain-like model of glass transition. The glassy phase is formed by a segmental relaxation and a relaxation due to glassy regions. The characteristic relaxation times of slow and segmental motions were well described by a modified Vogel-Fulcher-Tammann relation. The high frequency behavior, associated with the segmental motions, is well described by Havriliak-Negami and Kohlrausch-Williams-Watts formulas, which did not provide satisfactory fittings for the dynamics of slow regions. Both real and imaginary parts of the dielectric data were fully described by a complex dielectric relaxation function, the parameters of which are found by the eigen-coordinates (EC) method. © 2007 Elsevier B.V. All rights reserved.
dc.relation.ispartofseries Journal of Non-Crystalline Solids
dc.subject Dielectric properties relaxation
dc.subject Glass formation
dc.subject Glass transition
dc.subject relaxation, electric modulus
dc.title Real time dielectric monitoring of glass transition in n-vinyl pyrrolidone polymerization
dc.type Article
dc.relation.ispartofseries-issue 47-51
dc.relation.ispartofseries-volume 353
dc.collection Публикации сотрудников КФУ
dc.relation.startpage 4366
dc.source.id SCOPUS00223093-2007-353-4751-SID35548991398


Files in this item

This item appears in the following Collection(s)

  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

Show simple item record

Search DSpace


Advanced Search

Browse

My Account

Statistics