Tacticity of methacrylic copolymers and their crosslinked polymers studied by pyrolysis-gas chromatography

Abstract

Diad tacticity of methyl methacrylate (MMA) sequences in the copolymers of MMA and various acrylates and their crosslinked polymers was characterized by pyrolysis–gas chromatography (Py‐GC) based on the relative peak intensities of the diastereomeric MMA tetramers in the pyrograms. The diad tacticity in the copolymers synthesized at a given temperature proved to be almost consistent with that of corresponding MMA homopolymers (PMMA) prepared under the same conditions. Furthermore, the diad tacticity of PMMAs was also consistent with that of the corresponding crosslinked polymers. These results suggest that the tacticity of MMA sequences in the polymer chains would be dominated by polymerization temperature, independent of the copolymerization and crosslinking. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 78: 2140–2144, 2000

A pirólise como técnica analítica

“…Normalmente, a taticidade de um polímero é estudada por experimentos de ressonância magnética nuclear (RMN). 66 Porém, essa técnica requer grande quantidade de amostra, além da realização do experimento demandar muito tempo (usualmente mais de 8 h). Dessa forma, métodos analíticos mais rápidos e sensíveis para a determinação da taticidade de polímeros são de grande interesse para indústrias de polímeros para fins de controle de qualidade.…”