Title

Thermogravimetric Study of Ultrathin PMMA Films on Silica: Effect of Tacticity

Abstract

The degradation of isotactic and syndiotactic poly(methyl methacrylate) (PMMA) was studied by thermogravimetric analysis (TGA) with an emphasis on their behavior in ultrathin films on silica. Both PMMA tacticity and adsorbed amounts were found to affect the degradation. In bulk, syndiotactic PMMA (syn-PMMA) has higher thermal stability than isotactic PMMA (iso-PMMA) due to its lower chain mobility. The Tmax (maximum rate decomposition temperature) is lower than that of bulk samples at higher adsorbed amounts for both iso- and syn-PMMA. Tmax increases when the adsorbed amount on the silica surface decreases for syn-PMMA. The degradation behavior of adsorbed iso-PMMA became very complex at low adsorbed amounts.

Department(s)

Chemistry

Sponsor(s)

National Science Foundation (U.S.)

Library of Congress Subject Headings

Adsorption
Polymethylmethacrylate

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2003 Elsevier, All rights reserved.


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