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Strukturuntersuchung von polyestern durch direkten abbau im massenspektrometer, 4. Polyester und copolyester der milchsäure und glykolsäure

✍ Scribed by Jacobi, Erhard ;Lüderwald, Ingo ;Schulz, Rolf C.

Publisher
Wiley (John Wiley & Sons)
Year
1978
Weight
304 KB
Volume
179
Category
Article
ISSN
0025-116X

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✦ Synopsis

Abstract

Polyesters and copolyesters of 2‐hydroxyacetic acid (glycolic acid) and 2‐hydroxypropionic acid (lactic acid) were investigated by direct pyrolysis in the ion source of a mass spectrometer. Thermal degradation of these polyesters and copolyesters at 10^−6^ mbar yields cyclic oligomers which are further degraded by an electron impact induced mechanism by elimination of formaldehyde or acetaldehyde and CO~2~ to give characteristic series of linear ions. In the pyrolysis mass spectrum of a copolyester (mole ratio of monomeric units ≈1:1) intact sequences up to 8 monomeric units can be observed.

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