Naslov
Natural Rubber Filled by Nanosilica: an ESR - Spin Probe Study

Autori
Lekić, Andrica ; Valić, Srećko ; Meera, A.P. ; Thomas, Sabu

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

Izvornik
17th European Symposium on Polymer Spectroscopy / Wilhelm, Peter - Graz : Austrian Centre for Electron Microscopy and Nanoanalysis, 2007, 73-73

Skup
17th European Symposium on Polymer Spectroscopy

Mjesto i datum
Leibnitz, Austrija; Seggauberg, Austrija, 09.09.2007. - 12.09.2007

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
ESR ; spin probe ; natural rubber ; nanosilica

Sažetak
Natural rubber (NR) filled with the nanosilica particles having a diameter of 13 nm was crosslinked by sulphur. The sulphur content was constant and equal 2.5 phr in all samples. The amount of nanosilica was varied from 5 phr to 20 phr. In order to investigate the segmental dynamics and structural changes of NR matrix influenced by an addition of nanosilica, ESR - spin probe method was used. The measurements were performed with the free nitroxide radical 2, 2, 6, 6-tetramethylpiperidine-1-oxyl. The spin probe was incorporated in the material by swelling the samples in toluene probe solution. Spectra were measured in a wide temperature range from -100 °C to 80 °C. The results show that segmental dynamics is significantly influenced by the presence of nanosilica. In fact, a strong correlation between the nanosilica amount and the broad component of ESR spectra, characteristic for the slow segmental motions, has been observed. Moreover, the presence of the coupling agent and its effect on the motional inhomogeneity of NR matrix is discussed.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA