Analysis of ethylene oxide sequences of the acetal copolymer from trioxaneand ethylene oxide

Citation
N. Yamasaki et al., Analysis of ethylene oxide sequences of the acetal copolymer from trioxaneand ethylene oxide, J POL SC PC, 39(19), 2001, pp. 3239-3245
Citations number
19
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
ISSN journal
0887-624X → ACNP
Volume
39
Issue
19
Year of publication
2001
Pages
3239 - 3245
Database
ISI
SICI code
0887-624X(20011001)39:19<3239:AOEOSO>2.0.ZU;2-0
Abstract
An NMR method for the analysis of the ethylene oxide sequence of the acetal copolymer from trioxane and ethylene oxide has not yet been established. W e found three novel cyclic compounds composed of 1 mol of ethyelene oxide a nd 1 mol of trioxane, 2 mol of ethylene oxide and 1 mol of trioxane, and 3 mol of ethylene oxide and 1 mol of trioxane. These compounds gave only one consecutive oxyethylene unit, two consecutive oxyethylene units, and three consecutive oxyethylene units in three consecutive oxymethylene units, resp ectively, and gave different H-1 NMR spectra for each oxyethylene unit. Con sidering these data, we synthesized three polymeric model compounds that ha ve one consecutive oxyethylene sequence, two consecutive oxyethylene sequen ces, and three consecutive oxyethylene sequences in an oxymethylene main ch ain. By a linear combination of the H-1 NMR spectrum of each oxyethylene un it of the three polymeric model compounds, we succeeded in determining the ethylene oxide sequence by the H-1 NMR method for the copolymer from trioxa ne and ethylene oxide. Good agreement was observed between the H-1 NMR meth od and the hydrolysis method for the analysis of the ethylene oxide sequenc es. (C) 2001 John Wiley & Sons, Inc.