Description: Molecular Observation of Constraint Release in Polymer Melts

This title appears in the Scientific Report : 2006

Molecular Observation of Constraint Release in Polymer Melts

The dynamics of binary polymer blends of few labeled long chains in successively shorter matrix chains has been investigated by neutron spin echo (NSE) spectroscopy. For the first time the effect of constraint release on the chain relaxation has been directly observed on a microscopic scale. Decreas...

Personal Name(s):	Zamponi, M.
	Wischnewski, A. / Monkenbusch, M. / Willner, L. / Richter, D. / Likhtman, A. E. / Kali, G. / Farago, B.
Contributing Institute:	JCNS; JCNS Streumethoden; IFF-ISM Neutronenstreuung; IFF-INS
Published in:	Physical review letters, 96 (2006) S. 238302
Imprint:	College Park, Md. APS 2006
Physical Description:	238302
DOI:	10.1103/PhysRevLett.96.238302
Document Type:	Journal Article
Research Program:	Großgeräte für die Forschung mit Photonen, Neutronen und Ionen (PNI) Kondensierte Materie
Series Title:	Physical Review Letters 96
Subject (ZB):	J
Link:	Get full text OpenAccess
	Publikationsportal JuSER

Please use the identifier: http://dx.doi.org/10.1103/PhysRevLett.96.238302 in citations.
Please use the identifier: http://hdl.handle.net/2128/1151 in citations.

The dynamics of binary polymer blends of few labeled long chains in successively shorter matrix chains has been investigated by neutron spin echo (NSE) spectroscopy. For the first time the effect of constraint release on the chain relaxation has been directly observed on a microscopic scale. Decreasing the matrix chain length reduces the topological confinement until unconfined Rouse motion is observed, when the matrix chains are too short to confine the long chain in a tube. Whereas an analytical description of the effect is not yet available, a new simulation based on the slip-link model shows perfect agreement with the NSE data over the full range of matrix molecular weights.