Backbone and Ester Group Conformations of Stereoregular Poly(methyl methacrylate)s in the Stereocomplex

2003 ◽  
Vol 36 (6) ◽  
pp. 2179-2182 ◽  
Author(s):  
Oleg N. Tretinnikov
Keyword(s):  
Methyl Methacrylate ◽  
Ester Group ◽  
Poly Methyl Methacrylate

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

1992 ◽  
Vol 57 (2) ◽  
pp. 349-356 ◽  
Author(s):  
František Mikeš ◽  
Jan Pecka
Keyword(s):  
Methyl Methacrylate ◽  
Ester Group ◽  
Hydrolysis Rate ◽  
Nucleophilic Attack ◽  
Carbonyl Carbon Atom ◽  
Poly Methyl Methacrylate ◽  
Carboxylic Groups ◽  
Simple Kinetic Model ◽  
Rate Of Hydrolysis ◽  
Hydrolysis Of

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 s-poly(methyl methacrylate) is a random process, while 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.

Effect of Heat Treatment on Gradient Wetting of (Meth)Acrylate Copolymer Film Surfaces

2014 ◽  
Vol 703 ◽  
pp. 187-190 ◽  
Author(s):  
Yong Zhang ◽  
Jiang Cheng
Keyword(s):  
Heat Treatment ◽  
Methyl Methacrylate ◽  
Polymer Film ◽  
Butyl Acrylate ◽  
Ester Group ◽  
Contact Angles ◽  
Copolymer Film ◽  
Poly Methyl Methacrylate ◽  
Acrylate Polymer ◽  
Gradient Surface

The effect of heat treatment on gradient wetting of (meth) acrylate polymer film surfaces was analyzed. Poly (methyl methacrylate – butyl acrylate) and poly (methyl methacrylate – butyl acrylate - 2-hydroxyethyl methacrylate) were prepared by the free radical solution polymerization and their coating film wettability was obtained by measuring water contact angles (CAs). The gradient wetting surface was fabricated by a simple controlled ester group hydrolysis process on (meth) acrylate polymer film. The gradient wetting properties were attributed to the gradient surface chemistry from the ester group to acid salt on copolymer film. The copolymer films of gradient wetting were heated at 100 °C. It is found that the gradient materials will exhibit the unique wetting with the heating time increasing and the heat-resistance property of gradient surface needs further research.

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