Dynamics of polymer melts confined between adsorbing surfaces spaced at molecular dimensions

New physics emerges when polyphenylmethylsiloxane (PPMS) adsorbed between mica surfaces spaced at molecular dimensions undergoes oscillatory shear. The polymers experience a dynamic liquid-like to rubber-like transition at the onset of long range surface forces $(\sim$4.5 R$\sb{\rm G}).$ The long time relaxations of the polymers are effectively frustrated at the start of the strong repulsive short range surface forces (hard-wall $\sim$2.8 R$\sb{\rm G}).$ The static surface forces and dynamic regimes scale with the size of the polymer molecules. This reflects the universal ranges of polymer melts perturbed by the adsorbing surfaces.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Materials Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2011

Author dc:creator

• Hu, Hsuan-Wei

Contributors dc:contributor

• Granick, Steve

• Chemistry, Polymer
• Engineering, Chemical
• Engineering, Materials Science

Statement dc:rights

• Copyright 1992 Hu, Hsuan-Wei

Language dc:language

eng

Identifier

AAI9305559
(UMI)AAI9305559

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/21581