Strukturuntersuchung von polyestern durch direkten abbau im massenspektrometer, 3. Poly-β-propiolacton, poly-β-pivalolacton und poly-δ-valerolacton
✍ Scribed by Kricheldorf, Hans R. ;Lüderwald, Ingo
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1978
- Weight
- 256 KB
- Volume
- 179
- Category
- Article
- ISSN
- 0025-116X
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✦ Synopsis
Abstract
Poly(oxycarbonylethylene) (poly‐β‐propiolactone), poly(oxycarbonyl‐1,1‐dimeothylethylene) (poly‐β‐pivalolactone), and poly(oxycarbonyltetramethylene) (poly‐δ‐valerolactone) were pyrolyzed directly in the ion source of a mass spectrometer and their thermal and electron impact induced degradation mechanisms are established. Poly‐β‐propiolactone is thermally degraded by rupture of the OCH~2~‐bond by a cis elimination to give carboxyl and acryloyl endgroups, whereas poly‐δ‐valerolactone depolymerizes to δ‐valerolactone. Poly‐β‐pivalolactone degrades thermally to cyclic oligomers of pivalolactone, which could be proved by a separated pyrolysis and IR‐spectroscopy and gel chromatography.