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Copolymerization of glycolide and ϵ ‐caprolactone, 1. Analysis of the copolymer microstructure by means of 1 H and 13 C NMR spectroscopy
Author(s) -
Kasperczyk Janusz
Publication year - 1999
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(19990401)200:4<903::aid-macp903>3.0.co;2-6
Subject(s) - comonomer , copolymer , methylene , polymer chemistry , nuclear magnetic resonance spectroscopy , microstructure , proton nmr , caprolactone , transesterification , materials science , nmr spectra database , chemistry , carbon 13 nmr , organic chemistry , crystallography , spectral line , catalysis , polymer , physics , astronomy
A detailed analysis of the structure of glycolide/ ε ‐caprolactone copolymers was performed using 13 C and 1 H NMR. All methylene and carbonyl carbons of glycolidyl and caproyl units in the 13 C NMR spectra were found to be sensitive to the microstructure. The 1 H NMR spectra allow not only to determine the copolymer composition but also to analyze the chain microstructure. In the region of methylene protons of glycolide the resonance lines were ascribed to a series of compositional sequences, including those formed as a result of transesterification reactions. Equations are presented which allow to calculate the average lengths of comonomer blocks, the extent of transesterification, and the degree of randomness of the chain from both carbon and proton NMR spectra.