Napredna pretraga

Pregled bibliografske jedinice broj: 697689

Local molecular dynamics in rubber nanocomposites


Valić, Srećko; Klepac, Damir; Petković Didović, Mirna
Local molecular dynamics in rubber nanocomposites // Book of Abstracts / Dijana Žilić and Marina Ilakovac Kveder (ur.).
Zagreb: Ruđer Bošković Institute, 2014. str. 23-23 (pozvano predavanje, međunarodna recenzija, sažetak, ostalo)


Naslov
Local molecular dynamics in rubber nanocomposites

Autori
Valić, Srećko ; Klepac, Damir ; Petković Didović, Mirna

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, ostalo

Izvornik
Book of Abstracts / Dijana Žilić and Marina Ilakovac Kveder - Zagreb : Ruđer Bošković Institute, 2014, 23-23

ISBN
978-953-6690-99-2

Skup
Workshop: "Dynamics in Soft Matter Probed by Advanced EPR Techniques"

Mjesto i datum
Lužnica (Zagreb), Hrvatska, 05-09.05.2014

Vrsta sudjelovanja
Pozvano predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Rubber nanocomposite; local dynamics; EPR

Sažetak
Nanocomposite rubber films were prepared from natural rubber (NR) crosslinked with sulfur. Samples were doped with nanosilica and organically modified clays (Cloisite 10A, Cloisite 15A and Cloisite 20A). An effect of the addition of coupling agent was investigated on NR containing nanosilica particles. Nitroxyl radicals 4-oxo-2, 2, 6, 6-tetrametilpiperidin-1-oxyl (TEMPONE) and 4-hydroxy-2, 2, 6, 6-tetrametil-piperidin-1-oxyl (TEMPOL) were used as spin probes. The main objective of this study was to characterize the dynamic behavior of polyisoprene chain segments in the presence of nanofiller. ESR spectra were recorded in tha wide range of temperatures, from −100 °C to 130 °C. Spectra of TEMPONE and TEMPOL measured in the temperature region around 0 °C consist of broad and narrow components being attributed to the slow and fast rotational motions, respectively. An effect of composition (the type and amount of nanofiller) and the presence of coupling agent on the probe dynamics was observed by changes in the spectral shapes and correlational times of broad and narrow components. Spectra were calculated using NLSL program. ESR results are compared with those obtained by DSC, X-ray scattering, TEM and swelling experiments. [1] S. Valić, in Rubber Nanocomposites: Preparation, Properties and Applications, T. Sabu and R. Stephen Eds, John Wiley & Sons, 2010. p. 391-405. [2] M. Petković Didović, PhD Thesis, University of Zagreb, 2012.

Izvorni jezik
Engleski

Znanstvena područja
Kemija



POVEZANOST RADA


Ustanove
Medicinski fakultet, Rijeka,
Institut "Ruđer Bošković", Zagreb,
Katolički bogoslovni fakultet, Split