The Library
Mechanism of the thermal degradation of prepolymeric poly(3-nitratomethyl-3-methyloxetane)
Tools
UNSPECIFIED (1999) Mechanism of the thermal degradation of prepolymeric poly(3-nitratomethyl-3-methyloxetane). POLYMER, 40 (1). pp. 65-93. ISSN 0032-3861.
Research output not available from this repository.
Request-a-Copy directly from author or use local Library Get it For Me service.
Abstract
The thermal degradation of poly(3-nitratomethyl-3-methyloxetane), also called polynimmo, an important high-energy binder used in propellant formulations, has been examined by a variety of spectroscopic methods combined with exhaustive chromatography. Degradation results in the gradual increase in intensity of two main new absorptions around 1729 and 1550 cm(-1) in the solution infrared (i.r.) spectrum of polynimmo. The band at 1729 cm(-1) is attributed to the carbonyl group in a formate ester of which the associated formate proton and carbonyl carbon are clearly visible in the H-1 and C-13 n.m.r. spectra at 8.1 and 162 ppm, respectively, and can be cross-correlated by two-dimensional n.m.r. The absorption at 1550 cm(-1) is attributed to the asymmetric stretch of a nitro group attached to a tertiary carbon. We propose that this nitro species is formed by the recombination of NO2, following the loss of NO2 and subsequent elimination of CH2O from the polynimmo side-chains, with the resulting carbon radical. The assignment of this nitroalkane was confirmed by electrospray mass spectrometry, (including collision-induced decomposition studies) and n.m.r. spectroscopic characterization of a nearly pure sample of the cyclic tetrameric nitro species isolated from pyrolysed polynimmo using column chromatography. Degradation also results in the development of a strong electron spin resonance absorption attributed to a nitroxide radical produced in a secondary reaction. (C) 1998 Elsevier Science Ltd. All rights reserved.
Item Type: | Journal Article | ||||
---|---|---|---|---|---|
Subjects: | Q Science > QD Chemistry | ||||
Journal or Publication Title: | POLYMER | ||||
Publisher: | ELSEVIER SCI LTD | ||||
ISSN: | 0032-3861 | ||||
Official Date: | January 1999 | ||||
Dates: |
|
||||
Volume: | 40 | ||||
Number: | 1 | ||||
Number of Pages: | 29 | ||||
Page Range: | pp. 65-93 | ||||
Publication Status: | Published |
Data sourced from Thomson Reuters' Web of Knowledge
Request changes or add full text files to a record
Repository staff actions (login required)
View Item |