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Title: Role of “Hard” and “Soft” Confinement on Polymer Dynamics at the Nanoscale

Abstract

We investigated the segmental dynamics of asymmetrically confined polymer films and report an unusual phenomenon in which the presence and thickness of a soft confining layer are responsible for significant changes in the segmental dynamics of the confined films. Specifically, the segmental dynamics of poly(vinyl alcohol) (PVA) thin films asymmetrically confined between hard aluminum (Al), and soft polystyrene (PS) films are shown to shift by as much as half an order of magnitude upon changes in the thicknesses of the confining PS layer. These effects are more significant than those due to symmetric confinement between hard Al substrates or exposure to a free surface. These observations, partially rationalized in terms of recent simulations and theory, implicate the role of the moduli of the confining layers.

Authors:
ORCiD logo; ORCiD logo [1]
  1. National Renewable Energy Laboratory, Golden, Colorado 80401, United States
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
National Science Foundation (NSF)
OSTI Identifier:
1399849
Report Number(s):
NREL/JA-5A00-70298
Journal ID: ISSN 2161-1653
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Journal Article
Journal Name:
ACS Macro Letters
Additional Journal Information:
Journal Volume: 6; Journal Issue: 9; Journal ID: ISSN 2161-1653
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; polymers; segmental dynamics; films

Citation Formats

Sharma, Ravi P., and Green, Peter F. Role of “Hard” and “Soft” Confinement on Polymer Dynamics at the Nanoscale. United States: N. p., 2017. Web. doi:10.1021/acsmacrolett.7b00374.
Sharma, Ravi P., & Green, Peter F. Role of “Hard” and “Soft” Confinement on Polymer Dynamics at the Nanoscale. United States. doi:10.1021/acsmacrolett.7b00374.
Sharma, Ravi P., and Green, Peter F. Fri . "Role of “Hard” and “Soft” Confinement on Polymer Dynamics at the Nanoscale". United States. doi:10.1021/acsmacrolett.7b00374.
@article{osti_1399849,
title = {Role of “Hard” and “Soft” Confinement on Polymer Dynamics at the Nanoscale},
author = {Sharma, Ravi P. and Green, Peter F.},
abstractNote = {We investigated the segmental dynamics of asymmetrically confined polymer films and report an unusual phenomenon in which the presence and thickness of a soft confining layer are responsible for significant changes in the segmental dynamics of the confined films. Specifically, the segmental dynamics of poly(vinyl alcohol) (PVA) thin films asymmetrically confined between hard aluminum (Al), and soft polystyrene (PS) films are shown to shift by as much as half an order of magnitude upon changes in the thicknesses of the confining PS layer. These effects are more significant than those due to symmetric confinement between hard Al substrates or exposure to a free surface. These observations, partially rationalized in terms of recent simulations and theory, implicate the role of the moduli of the confining layers.},
doi = {10.1021/acsmacrolett.7b00374},
journal = {ACS Macro Letters},
issn = {2161-1653},
number = 9,
volume = 6,
place = {United States},
year = {2017},
month = {8}
}