Determination of the Tacticity of Poly(methyl methacrylate) by Hydrolysis Rate Measurements

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Title:Determination of the Tacticity of Poly(methyl methacrylate) by Hydrolysis Rate Measurements
Creators:
Mikeš, František
Pecka, Jan
Journal or Publication Title:
Collection of Czechoslovak Chemical Communications, 57, 2, pp. 349-356

Abstract

The rate of hydrolysis of poly(methyl methacrylate) increases with the content of meso(isotactic) diads in the polymer. The increase in the rate of hydrolysis of isotactic polymers is due to an intramolecular nucleophilic attack by the adjacent carboxylic ion on the carbonyl carbon atom in the ester group. An analysis of the content of sequences of variously arranged ester and carboxylic groups shows that the hydrolysis of <i>s</i>-poly(methyl methacrylate) is a random process, while <i>i</i>-poly(methyl methacrylate) is hydrolyzed gradually (by zip mechanism), starting from the carboxylate group formed by an external attack by hydroxylic ions. The kinetic data thus obtained cannot be interpreted in terms of a simple kinetic model. The tacticity of poly(methyl methacrylate) may be estimated from the dependence of the rate of hydrolysis on the content of meso diads determinated by NMR spectrometry. The rate of hydrolysis depends not only on the tacticity of the polymer, but probably also on its configurational sequence statistics.

Title:Determination of the Tacticity of Poly(methyl methacrylate) by Hydrolysis Rate Measurements
Creators:
Mikeš, František
Pecka, Jan
Divisions:Life and Chemical Sciences > Institute of Organic Chemistry and Biochemistry > Collection of Czechoslovak Chemical Communications
Journal or Publication Title:Collection of Czechoslovak Chemical Communications
Volume:57
Number:2
Page Range:pp. 349-356
ISSN:0010-0765
E-ISSN:1212-6950
Publisher:Institute of Organic Chemistry and Biochemistry
Related URLs:
URLURL Type
http://dx.doi.org/10.1135/cccc19920349UNSPECIFIED
ID Code:3759
Item Type:Article
Deposited On:06 Feb 2009 16:36
Last Modified:06 Feb 2009 15:38

Citation

Mikeš, František; Pecka, Jan (1992) Determination of the Tacticity of Poly(methyl methacrylate) by Hydrolysis Rate Measurements. Collection of Czechoslovak Chemical Communications, 57 (2). pp. 349-356. ISSN 0010-0765

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