Comparative analysis of damping of linear, pom-pom and branched polymers

0345319 - ÚH 2011 CA eng C - Konferenční příspěvek (zahraniční konf.)
Kharlamov, Alexander - Rolón-Garrido, V. H. - Filip, Petr
Comparative analysis of damping of linear, pom-pom and branched polymers.
Proceedings of the Polymer Processing Society 26th Annual Meeting (PPS-26). Banff: Polymer Processing Society, 2010, Article no. G15-355. ISBN N.
[Annual Meeting of Polymer Processing Society /26./. Banff (CA), 04.07.2010-08.07.2010]
Grant CEP: GA ČR GA103/09/2066
Výzkumný záměr: CEZ:AV0Z20600510
Klíčová slova: damping function * branched polymers * probability distribution * molecule end-to-end vector * retraction
Kód oboru RIV: BK - Mechanika tekutin

Behavior of linear polymers is well characterized by Doi and Edwards (DE) theory and represents basis for describing any polymeric systems. Compared to linear polymers, the pom-pom polymers exhibit weaker damping for small strains, and collapse to DE damping for higher strains with branching point withdrawal. The branched polymers (combs and commercial LDPEs) exhibit weaker damping than the linear polymers, and do not show sudden branching point withdrawal. The branching points of those polymers are distributed randomly along backbone and produce less resistance to retraction than in pom-pom polymers. Thereafter, the branching points are, probably, withdrawn smoothly during deformation and the polymer backbone is subject to DE dynamics. This behavior brings in explanation of weaker damping of branched polymers.
Trvalý link: http://hdl.handle.net/11104/0186623