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Spatial inhomogeneity, interfaces and complex vitrification kinetics in a network forming nanocomposite

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dc.contributor.author Szymoniak P.
dc.contributor.author Qu X.
dc.contributor.author Abbasi M.
dc.contributor.author Pauw B.R.
dc.contributor.author Henning S.
dc.contributor.author Li Z.
dc.contributor.author Wang D.Y.
dc.contributor.author Schick C.
dc.contributor.author Saalwächter K.
dc.contributor.author Schönhals A.
dc.date.accessioned 2022-02-09T20:40:43Z
dc.date.available 2022-02-09T20:40:43Z
dc.date.issued 2021
dc.identifier.issn 1744-683X
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/169624
dc.description.abstract A detailed calorimetric study on an epoxy-based nanocomposite system was performed employing bisphenol A diglycidyl ether (DGEBA) cured with diethylenetriamine (DETA) as the polymer matrix and a taurine-modified MgAL layered double hydroxide (T-LDH) as the nanofiller. The -NH2group of taurine can react with DGEBA improving the interaction of the polymer with the filler. The combined X-ray scattering and electron microscopy data showed that the nanocomposite has a partially exfoliated morphology. Calorimetric studies were performed using conventional DSC, temperature modulated DSC (TMDSC) and fast scanning calorimetry (FSC) in the temperature modulated approach (TMFSC) to investigate the vitrification and molecular mobility dependent on the filler concentration. First, TMDSC and NMR were used to estimate the amount of the rigid amorphous fraction which consists of immobilized polymer segments at the nanoparticle surface. It was found to be 40 wt% for the highest filler concentration, indicating that the interface dominates the overall macroscopic properties and behavior of the material to a great extent. Second, the relaxation rates of thea-relaxation obtained by TMDSC and TMFSC were compared with the thermal and dielectric relaxation rates measured by static FSC. The investigation revealed that the system shows two distincta-relaxation processes. Furthermore, two separate vitrification mechanisms were also found for a bulk network-former without geometrical confinement as also confirmed by NMR. This was discussed in terms of the intrinsic spatial heterogeneity on a molecular scale, which becomes more pronounced with increasing nanofiller content.
dc.relation.ispartofseries Soft Matter
dc.title Spatial inhomogeneity, interfaces and complex vitrification kinetics in a network forming nanocomposite
dc.type Article
dc.relation.ispartofseries-issue 10
dc.relation.ispartofseries-volume 17
dc.collection Публикации сотрудников КФУ
dc.relation.startpage 2775
dc.source.id SCOPUS1744683X-2021-17-10-SID85102768986


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

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