Use this URL to cite or link to this record in EThOS:
Title: Matrix assisted laser desorption/ionisation time-of-flight mass spectroscopic analysis of synthetic polymers
Author: Snel, Marten Francis
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1999
Availability of Full Text:
Access from EThOS:
Full text unavailable from EThOS. Please try the link below.
Access from Institution:
Matrix assisted laser desorption/ionisation time-of-flight mass spectrometry was used to mass analyse a range of synthetic polymers. Synthetic polymers with average molecular weights of up to 20000 Da were investigated. The polymers studied included polyglycols, polystyrene and poly(methyl methacrylate). Information on the repeat units, endgroups and average molecular weights was obtained. The stability of metal ion/polymer adducts was studied for poly(ethylene glycol) (PEG), poly(propylene glycol) (PPG) and poly(methyl methacrylate) (PMMA) adducts of lithium, sodium, potassium and rubidium, as well as the silver ion adduct of polystyrene. No post source decay (PSD) was seen for the lithium and sodium adducts of PEG, PPG and PMMA, however potassium and rubidium adducts of these polymers did undergo PSD. Rubidium adducts were seen to decay more readily than the potassium adducts. Pulsed-field delayed ion extraction experiments were carried out. These experiments suggest that gas-phase reactions contribute comparatively little to the cation adduct formation of synthetic polymers. Further experiments showed that the ratio between salt and matrix in the sample did not affect the ionisation behaviour. During the course of this work several improvements were made to the mass spectrometer used. The length of the time-of-flight mass analyser was increased and an inline detector was fitted to the existing instrument. The addition of the second detector made it possible to operate the instrument in a linear mode. A mass gate was added to make it possible to avoid detector saturation by low-mass ions.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available