Determination of molecular weight distributions of polyglycol oligomers by field desorption mass spectrometry

Lattimer, Robert P.; Hansen, G.E.

doi:10.1021/ma50004a059

Cited by 54 publications

(24 citation statements)

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“…4 6 H (and, by inference, for the higher PEG oligomers), then the PEG oligomers would constitute another series of compounds for which the abundance of the molecular ion passes through a minimum and then increases with increasing molecular weight, as has been reported for aliphatic acids and their methyl esters. 5 Soft ionization techniques have been used to characterize mixtures of PEG oligomers and some high molecular weight derivatives: fast-atom bombardment (FAB), 6 field desorption (FD), 7,8 electrospray ionization (ESI), 9,10 laser desorption, 11 collisionally-induced dissociation (CID) [12][13][14][15][16] and electrohydrodynamic ionization (EHD). 17 These studies were generally carried out to demonstrate the utility of each technique for polymer identification and the techniques are not generally applicable for characterization of lower molecular weight oligomers.…”

Section: Introductionmentioning

confidence: 99%

Gas Chromatography/Mass Spectrometry of Polyethylene Glycol Oligomers

Onigbinde

Nicol

Munson

2001

Eur J Mass Spectrom (Chichester)

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Polyethylene glycol (PEG) oligomers, H(OC 2 H 4 O) n H, were analyzed by gas chromatography/mass spectrometry (GC/MS) for oligomers, n = 2-11, without indications of pyrolysis of the higher oligomers at oven temperatures of 330°C. The electron ionization (EI) mass spectra (70 eV and 12-14 eV) of these PEG oligomers contain only low molecular weight fragment ions and, essentially, no M + ions. The low-voltage EI spectra contain more abundant high mass ions and allow easier identification of the PEG oligomers. The major fragment ions in all EI spectra are (C 2 H 4 O) x H + at m/z 45, 89, 133 and 177. The base peak in the low-voltage spectra varies with molecular weight and suggests preferential cleavage at the second and third ether linkages. The relative molar sensitivities (70 eV EI) of PEG oligomers (n = 1-6) are linear functions of molecular weight or polarizability ratios. The CH 4 chemical ionization mass spectra of the PEG oligomers contain, predominantly, (C 2 H 4 O) x H + ions at m/z 45, 89, 133 and 177. The relative abundances of MH + ions vary markedly across the chromatographic peaks because these ions are formed predominantly by sample ion / sample molecule reactions. Proton transfer reactions from CH 5 + and C 2 H 5 + to the PEG oligomers are almost entirely dissociative. The i-C 4 H 10 CI mass spectra of PEG oligomers contain MH + as the base peaks. The relative abundances of MH + ions do not vary significantly across the chromatographic peaks but do increase with increasing pressure of i-C 4 H 10. The extent of decomposition of MH + ions in i-C 4 H 10 CI mass spectra increases with increasing molecular weight of the PEG oligomers. Relative molar sensitivities (CH 4 CI and i-C 4 H 10 CI) of PEG oligomers (n = 1-6) are essentially the same linear functions of molecular weight ratio.

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Section: Introductionmentioning

confidence: 99%

Gas Chromatography/Mass Spectrometry of Polyethylene Glycol Oligomers

Onigbinde

Nicol

Munson

2001

Eur J Mass Spectrom (Chichester)

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“…The affinity of these polyethers to alkali metal cations has been well studied, indicating that binding of these cations occurs with multiple oxygen atoms of the polymer chain 2–4. A variety of polyethers has been characterised using MS,5–12 with most recent reports focusing on use of matrix‐assisted laser desorption/ionisation (MALDI) for the generation of ions 6–12. Mass spectrometry, especially MALDI time‐of‐flight (MALDI‐TOF), is now a standard methodology for the generation of information on end groups and molecular weight distributions from polyethers.…”

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confidence: 99%

Generation of end‐group information from polyethers by matrix‐assisted laser desorption/ionisation collision‐induced dissociation mass spectrometry

Jackson

Green

Bateman

2006

Rapid Comm Mass Spectrometry

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A series of polyethers, namely poly(ethylene glycol) (PEG), poly(propylene glycol) (PPG), poly(butylene glycol) (PBG) and poly(tetramethylene glycol) (PTMeG), has been characterised by means of matrix-assisted laser desorption/ionisation collision-induced dissociation (MALDI-CID) using a hybrid sector orthogonal-time-of-flight (TOF) instrument. The data indicate that this technique can be used to generate information about the end-group functionality of these polymers, including in some cases information about branching of the alkyl chains of the initiating groups. Proposals are made for the fragmentation pathways for these polymers.

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“…Mass spectral data were observed on polybutadiene samples with molecular weights in the range of 1000-3000 (181), on PEG and PPG oligomers (182), and on polystyrene oligomers (183) by field desorption MS.…”

Section: Nuclear Magnetic Resonancementioning

confidence: 99%

Spectroscopic Methods in Research and Analysis of Coatings and Plastics

Craver¹

1985

ACS Symposium Series

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Determination of molecular weight distributions of polyglycol oligomers by field desorption mass spectrometry

Cited by 54 publications

References 1 publication

Gas Chromatography/Mass Spectrometry of Polyethylene Glycol Oligomers

Gas Chromatography/Mass Spectrometry of Polyethylene Glycol Oligomers

Generation of end‐group information from polyethers by matrix‐assisted laser desorption/ionisation collision‐induced dissociation mass spectrometry

Spectroscopic Methods in Research and Analysis of Coatings and Plastics

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