Structural Relaxation of Polymer Glasses at Surfaces, Interfaces, and In Between

by: Rodney D Priestley, Christopher J Ellison, Linda J Broadbelt, John M Torkelson

Science, Vol. 309, No. 5733. (15 July 2005), pp. 456-459.

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摘要

We analyzed the glassy-state structural relaxation of polymers near surfaces and interfaces by monitoring fluorescence in multilayer films. Relative to that of bulk, the rate of structural relaxation of poly(methyl methacrylate) is reduced by a factor of 2 at a free surface and by a factor of 15 at a silica substrate interface; the latter exhibits a nearly complete arresting of relaxation. The distribution in relaxation rates extends more than 100 nanometers into the film interior, a distance greater than that over which surfaces and interfaces affect the glass transition temperature. 10.1126/science.1112217

@article{torkelson05, abstract = {We analyzed the glassy-state structural relaxation of polymers near surfaces and interfaces by monitoring fluorescence in multilayer films. Relative to that of bulk, the rate of structural relaxation of poly(methyl methacrylate) is reduced by a factor of 2 at a free surface and by a factor of 15 at a silica substrate interface; the latter exhibits a nearly complete arresting of relaxation. The distribution in relaxation rates extends more than 100 nanometers into the film interior, a distance greater than that over which surfaces and interfaces affect the glass transition temperature. 10.1126/science.1112217}, author = {Priestley, Rodney D. and Ellison, Christopher J. and Broadbelt, Linda J. and Torkelson, John M. }, citeulike-article-id = {1836349}, doi = {http://dx.doi.org/10.1126/science.1112217}, journal = {Science}, keywords = {confinement, glass, polymer}, month = {July}, number = {5733}, pages = {456--459}, posted-at = {2007-10-29 17:52:11}, priority = {4}, title = {Structural Relaxation of Polymer Glasses at Surfaces, Interfaces, and In Between}, url = {http://dx.doi.org/10.1126/science.1112217}, volume = {309}, year = {2005} }

RIS record

TY - JOUR ID - torkelson05 L3 - citeulike-article-id:1836349 N2 - We analyzed the glassy-state structural relaxation of polymers near surfaces and interfaces by monitoring fluorescence in multilayer films. Relative to that of bulk, the rate of structural relaxation of poly(methyl methacrylate) is reduced by a factor of 2 at a free surface and by a factor of 15 at a silica substrate interface; the latter exhibits a nearly complete arresting of relaxation. The distribution in relaxation rates extends more than 100 nanometers into the film interior, a distance greater than that over which surfaces and interfaces affect the glass transition temperature. 10.1126/science.1112217 IS - 5733 JF - Science EP - 459 TI - Structural Relaxation of Polymer Glasses at Surfaces, Interfaces, and In Between VL - 309 SP - 456 KW - confinement KW - glass KW - polymer AU - Priestley, Rodney AU - Ellison, Christopher AU - Broadbelt, Linda AU - Torkelson, John PY - 2005/07/15/ UR - http://dx.doi.org/10.1126/science.1112217 ER -

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