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wizyta

od 2020-09-20

Dr Bakyt Orozbaev  | 1999-10 <> 2018-01

  23089111800  

Zainteresowania naukowe:
Dynamika molekularna w mieszaninach polimerowych, spektroskopia dielektryczna

Publikacje                Magistrowie           Seminaria


2.

Orozbaev B., Fojud Z., Makrocka-Rydzyk M., Schroeder G., Jurga S.

Molecular dynamics of podand studied by broadband dielectric and nuclear magnetic resonance spectroscopies Nuclear magnetic resonance (NMR) and broadband dielectric spectroscopies (BDS) were used toanalyze the molecular dynamics in P10.3H Podand. The temperature studies of NMR line and magnetic spin-lattice relaxation times accompanied by DS investigation enabled us to distinguish three main dynamical processes connected with the motions of the P10.3H Podand chains. In the low-temperature region the magnetic relaxation was associated with fast axial C-3 rotation of methyl groups. Moreover, two other independent processes were observed and interpreted as (i) segmental motion of both oxyethylene and ethylene units, and (ii) the overall motion involved in the melting process.

Macromolecular Chemistry and Physics, 208(19-20), 2121-2127 (2007)

DOI: 10.1002/macp.200700197   (Pobrane:  2008-01-09)


1.

Makrocka-Rydzyk M., Orozbaev B., Nowaczyk G., Głowinkowski S., Jurga S.

Molecular dynamics in cyclic olefin copolymer Nuclear magnetic resonance, broadband dielectric spectroscopy and dynamic-mechanical thermal analysis were employed to study molecular dynamics of ethylene-norbornene copolymer. The analysis of experimental data indicates existence of three motional processes denoted as α, β, and γ in order of decreasing temperature. The α relaxation is related to the dynamic glass transition, while the beta relaxation, observed only for the untreated sample, is assigned to short range segmental motions involving norbornene units. The γ relaxation is due to very local motions of ethylene units e.g. trans-gauche isomerization, similar to those responsible for γ relaxation in polyethylene. The rate of motion accountable for γ process, follows the Vogel-Fulcher-Tammann equation, similarly to alpha transition, indicating cooperative nature of the motion.

Acta Physica Polonica A, 108(2), 385 (2005)

DOI: 10.12693/APhysPolA.108.385
WWW: http://przyrbwn.icm.edu.pl/APP/PDF/108/a108z221.pdf   (Pobrane:  2021-01-10)


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