Molecular weight dependence of 2D-confined dynamics in glass-forming systems

DOI

We seek to explore the dynamics of glass forming systems upon extreme 2D-confinement. These experiments are motivated by preliminary experiments on oligomers and macromolecules of poly(ethylene glycol) confined in graphite oxide by dielectric spectroscopy (DS) and INS on TOSCA. The results showed that the extreme spatial confinement is responsible for the suppression of crystallization and alpha-relaxation processes. Moreover, our systematic study on the molecular size effects on the confinement by DS showed a strong deviation of the characteristic time of the beta-relaxation respect to the Arrhenius-like temperature dependence in the low-molecular weight systems. With the experiments proposed in IRIS we seek to clarify the following questions: are the motions leading to this relaxation of localized or of diffusive nature? Does the nature/geometry of the motions change with conectivity?

Identifier
DOI https://doi.org/10.5286/ISIS.E.24088954
Metadata Access https://icatisis.esc.rl.ac.uk/oaipmh/request?verb=GetRecord&metadataPrefix=oai_datacite&identifier=oai:icatisis.esc.rl.ac.uk:inv/24088954
Provenance
Creator Dr Victoria Garcia Sakai; Professor Arantxa Arbe; Professor Fabienne Barroso-Bujans; Professor Juan Colmenero
Publisher ISIS Neutron and Muon Source
Publication Year 2015
Rights CC-BY Attribution 4.0 International; https://creativecommons.org/licenses/by/4.0/
OpenAccess true
Contact isisdata(at)stfc.ac.uk
Representation
Resource Type Dataset
Discipline Photon- and Neutron Geosciences
Temporal Coverage Begin 2012-06-06T08:10:33Z
Temporal Coverage End 2012-10-08T11:03:20Z