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Please use this identifier to cite or link to this item: http://hdl.handle.net/11375/25262
Title: Shear Deformation in Thin Polymer Films as a Probe of Entanglement in Confined Systems
Authors: Si, Lun
Advisor: Dalnoki-Veress, Kari
Department: Materials Science and Engineering
Keywords: shear deformation zone;thin polymer films
Publication Date: 2003
Abstract: We present the results of our study of the shear deformation zone in free-standing thin polymer films as a probe of entanglement in confined systems. A stretching system was used to uniaxially strain thin polystyrene (PS) films. Atomic force microscopy was used to measure the thicknesses of the shear deformation zone (SDZ), hc, and the film thicknesses h. The maximum extension ratio 2 - h/hc, was measured as a function of film thickness. The results show that A increases with the decreasing film thickness which implies an increase in the entanglement molecular weight in confinement. The same experiments were carried out for thin PS film with different molecular weights. A tentative model was developed to explain the experimental results and found to be in good agreement with the data. More exciting is the fact that the model predicts a scaling dependence on the polymer molecular weight which was also observed.
URI: http://hdl.handle.net/11375/25262
Appears in Collections:Digitized Open Access Dissertations and Theses

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