Title

Segmental Dynamics of Poly(methyl Acrylate)-d₃ Adsorbed on Anopore: A Deuterium NMR Study

Abstract

The segmental dynamics of poly(methyl acrylate-d3) (PMA-d3) adsorbed in the pores of anopore membranes has been investigated using deuterium NMR over the temperature range 25-80 C. The onset of the NMR glass-transition temperature (Tg) for the adsorbed samples was approximately 15 C higher than that for the bulk sample. The adsorbed polymer contained segments with restricted mobility (glassy), even at the highest temperatures studied, at which the bulk polymer showed only mobile segments. The spectra from samples with different adsorbed amounts of PMA-d3, between 1.1 and 4.2 mg/m2, were similar in their temperature-dependent mobilities. Neither was there much difference in the spectra of PMA-d3 on anopore samples with pore sizes of 0.2 and 0.02 m. However, for a solvent-washed sample with an adsorbed amount of 0.7 mg/m2, additional restriction in PMA-d3 mobility was observed.

Department(s)

Chemistry

Sponsor(s)

National Science Foundation (U.S.)

Library of Congress Subject Headings

Deuterium
Glass transition temperature
Nuclear magnetic resonance

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2008 American Chemical Society (ACS), All rights reserved.


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