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Multivariate analysis of 13C NMR spectra of methacrylate copolymers and homopolymer blends

✍ Scribed by Hikaru Momose; Kosuke Hattori; Tomohiro Hirano; Koichi Ute

Publisher
Elsevier Science
Year
2009
Tongue
English
Weight
170 KB
Volume
50
Category
Article
ISSN
0032-3861

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✦ Synopsis

13 C NMR spectra of copolymers of methyl methacrylate and tert-butyl methacrylate with various chemical compositions, the homopolymers of the two methacrylates, and blends of the homopolymers with various blend ratios were subjected to principal component analysis. The first and second principal components correlated chemical composition and the randomness of comonomer sequence, respectively. Chemical composition of the copolymers was determined with high accuracy and precision by the partial least-squares regression without assignment of individual resonance peaks.

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Methyl methacrylate (MMA) was copolymerized with vinyl triethoxy silane (VTES) using 60 Co g-radiation at varying mol fractions of VTES from 0.02 to 0.11. The homopolymers of MMA and VTES were also synthesized by the same method. Homopolymer blends having different VTES mol fractions varying from 0.