- Tytuł:
- Molecular Dynamics in Cyclic Olefin Copolymer
- Autorzy:
-
Makrocka-Rydzyk, M.
Orozbaev, B.
Nowaczyk, G.
Głowinkowski, S.
Jurga, S. - Powiązania:
- https://bibliotekanauki.pl/articles/2043644.pdf
- Data publikacji:
- 2005-08
- Wydawca:
- Polska Akademia Nauk. Instytut Fizyki PAN
- Tematy:
-
36.20.Ey
76.60.-k
77.22.Gm
83.85.Vb
82.35.Jk - Opis:
- 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 αβ, andγ in order of decreasing temperature. Theα relaxation is related to the dynamic glass transition, while the β relaxation, observed only for the untreated sample, is assigned to short range segmental motions involving norbornene units. Theγ relaxation is due to very local motions of ethylene units e.g. trans-gauche isomerization, similar to those responsible forγ relaxation in polyethylene. The rate of motion accountable for γ process, follows the Vogel-Fulcher-Tammann equation, similarly to α transition, indicating cooperative nature of the motion.
- Źródło:
-
Acta Physica Polonica A; 2005, 108, 2; 385-393
0587-4246
1898-794X - Pojawia się w:
- Acta Physica Polonica A
- Dostawca treści:
- Biblioteka Nauki
Artykuł