Application of hot-stage microscopy Direct Analysis in Real-Time mass spectrometry (HDM) to the analysis of polymers

Research output: Contribution to journalSpecial issue

Abstract

Rationale: Polymers are ubiquitous, and characterisation of their chemical, thermal and mechanical properties is important in many applications. Hot-stage microscopy Direct Analysis in Real Time mass spectrometry (HDM) is a new technique which combines optical measurements with the benefits of ambient ionisation mass spectrometry. Physical and chemical information can be obtained as a function of sample temperature, in real time. Methods: Samples were placed on a miniaturised hot-stage between a custom-made Direct Analysis in Real Time (DART) source and the inlet of an ion trap mass spectrometer, and subjected to both linear and cycled temperature programmes. Optical images were collected using a digital microscope and mass spectra (positive and negative ion) were recorded simultaneously. Results: Mass spectra and optical images were used to monitor the thermal expansion and release of volatile oligomers from both medical and domestic grades of silicone. Series of ions separated by 74 m/z units were observed, consistent with the SiOMe 2 monomer; the median mass of these increased with increasing temperature up to the decomposition point (340–400°C). The abundance of volatile material produced decreased with repeated thermal cycling. The coefficients of thermal expansion were calculated from optical data and were in agreement with conventional measurements (2.7–3.6 × 10 −4°C −1). Two samples of beach sand analysed for the presence of microplastics were found to contain polyethylene and polystyrene, respectively. Conclusions: Results indicate that the novel technique of HDM can be successfully applied to the characterisation of a wide range of polymers including those in complex matrices.

Original languageEnglish
JournalRapid Communications in Mass Spectrometry
Early online date8 Jul 2019
DOIs
Publication statusE-pub ahead of print - 8 Jul 2019

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Mass spectrometry
Microscopic examination
Polymers
Thermal expansion
Ions
Polystyrenes
Polyethylene
Thermal cycling
Mass spectrometers
Silicones
Beaches
Oligomers
Temperature
Chemical properties
Ionization
Microscopes
Negative ions
Sand
Thermodynamic properties
Monomers

Cite this

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title = "Application of hot-stage microscopy Direct Analysis in Real-Time mass spectrometry (HDM) to the analysis of polymers",
abstract = "Rationale: Polymers are ubiquitous, and characterisation of their chemical, thermal and mechanical properties is important in many applications. Hot-stage microscopy Direct Analysis in Real Time mass spectrometry (HDM) is a new technique which combines optical measurements with the benefits of ambient ionisation mass spectrometry. Physical and chemical information can be obtained as a function of sample temperature, in real time. Methods: Samples were placed on a miniaturised hot-stage between a custom-made Direct Analysis in Real Time (DART) source and the inlet of an ion trap mass spectrometer, and subjected to both linear and cycled temperature programmes. Optical images were collected using a digital microscope and mass spectra (positive and negative ion) were recorded simultaneously. Results: Mass spectra and optical images were used to monitor the thermal expansion and release of volatile oligomers from both medical and domestic grades of silicone. Series of ions separated by 74 m/z units were observed, consistent with the SiOMe 2 monomer; the median mass of these increased with increasing temperature up to the decomposition point (340–400°C). The abundance of volatile material produced decreased with repeated thermal cycling. The coefficients of thermal expansion were calculated from optical data and were in agreement with conventional measurements (2.7–3.6 × 10 −4°C −1). Two samples of beach sand analysed for the presence of microplastics were found to contain polyethylene and polystyrene, respectively. Conclusions: Results indicate that the novel technique of HDM can be successfully applied to the characterisation of a wide range of polymers including those in complex matrices.",
author = "Gage Ashton and Lindsay Harding and Gareth Parkes and Sophie Pownall",
year = "2019",
month = "7",
day = "8",
doi = "10.1002/rcm.8522",
language = "English",
journal = "Rapid Communications in Mass Spectrometry",
issn = "0951-4198",
publisher = "John Wiley and Sons Ltd",

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T1 - Application of hot-stage microscopy Direct Analysis in Real-Time mass spectrometry (HDM) to the analysis of polymers

AU - Ashton, Gage

AU - Harding, Lindsay

AU - Parkes, Gareth

AU - Pownall, Sophie

PY - 2019/7/8

Y1 - 2019/7/8

N2 - Rationale: Polymers are ubiquitous, and characterisation of their chemical, thermal and mechanical properties is important in many applications. Hot-stage microscopy Direct Analysis in Real Time mass spectrometry (HDM) is a new technique which combines optical measurements with the benefits of ambient ionisation mass spectrometry. Physical and chemical information can be obtained as a function of sample temperature, in real time. Methods: Samples were placed on a miniaturised hot-stage between a custom-made Direct Analysis in Real Time (DART) source and the inlet of an ion trap mass spectrometer, and subjected to both linear and cycled temperature programmes. Optical images were collected using a digital microscope and mass spectra (positive and negative ion) were recorded simultaneously. Results: Mass spectra and optical images were used to monitor the thermal expansion and release of volatile oligomers from both medical and domestic grades of silicone. Series of ions separated by 74 m/z units were observed, consistent with the SiOMe 2 monomer; the median mass of these increased with increasing temperature up to the decomposition point (340–400°C). The abundance of volatile material produced decreased with repeated thermal cycling. The coefficients of thermal expansion were calculated from optical data and were in agreement with conventional measurements (2.7–3.6 × 10 −4°C −1). Two samples of beach sand analysed for the presence of microplastics were found to contain polyethylene and polystyrene, respectively. Conclusions: Results indicate that the novel technique of HDM can be successfully applied to the characterisation of a wide range of polymers including those in complex matrices.

AB - Rationale: Polymers are ubiquitous, and characterisation of their chemical, thermal and mechanical properties is important in many applications. Hot-stage microscopy Direct Analysis in Real Time mass spectrometry (HDM) is a new technique which combines optical measurements with the benefits of ambient ionisation mass spectrometry. Physical and chemical information can be obtained as a function of sample temperature, in real time. Methods: Samples were placed on a miniaturised hot-stage between a custom-made Direct Analysis in Real Time (DART) source and the inlet of an ion trap mass spectrometer, and subjected to both linear and cycled temperature programmes. Optical images were collected using a digital microscope and mass spectra (positive and negative ion) were recorded simultaneously. Results: Mass spectra and optical images were used to monitor the thermal expansion and release of volatile oligomers from both medical and domestic grades of silicone. Series of ions separated by 74 m/z units were observed, consistent with the SiOMe 2 monomer; the median mass of these increased with increasing temperature up to the decomposition point (340–400°C). The abundance of volatile material produced decreased with repeated thermal cycling. The coefficients of thermal expansion were calculated from optical data and were in agreement with conventional measurements (2.7–3.6 × 10 −4°C −1). Two samples of beach sand analysed for the presence of microplastics were found to contain polyethylene and polystyrene, respectively. Conclusions: Results indicate that the novel technique of HDM can be successfully applied to the characterisation of a wide range of polymers including those in complex matrices.

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