On a weaker damping function of branched polymers

0343116 - ÚH 2011 SE eng A - Abstrakt
Kharlamov, Alexander - Rolón-Garrido, V. H. - Filip, Petr
On a weaker damping function of branched polymers.
Annual European Rheology Conference 2010: Book of Abstracts. Göteborg: European Society of Rheology, 2010. s. 279. ISBN N.
[AERC 2010 /6./. 07.04.2010-09.04.2010, Göteborg]
Grant CEP: GA ČR GA103/09/2066
Výzkumný záměr: CEZ:AV0Z20600510
Klíčová slova: polymer chains * molecular modeling * shear * stress
Kód oboru RIV: BK - Mechanika tekutin

The branched polymers exhibit weaker damping than the linear polymers that are subject to theory of Doi and Edwards (DE). The pom-pom polymers exhibit weaker damping for small strains, and collapse to DE damping for higher strains with branching point withdrawal. For branched polymers (comb or commercial LDPEs) branching points are distributed randomly along backbone, and their damping shows no sudden branching point withdrawal and remains weaker than that of the linear polymers. In present research there is presented a possible explanation of weaker damping of branched polymers with assumption that branching points are withdrawn smoothly and retraction of backbone after step deformation is in accordance with DE mechanics.
Trvalý link: http://hdl.handle.net/11104/0185667