ISIS Neutron and Muon Source Data Journal
This is a page describing data taken during an experiment at the ISIS Neutron and Muon Source. Information about the ISIS Neutron and Muon Source can be found at https://www.isis.stfc.ac.uk.
Molecular dynamics of a catalysed epoxy resin (DGEBA) as a function of temperature
Abstract: Epoxy resin polymers primarily consist of long chain hydrocarbons in a network, which exist in an amorphous structure. These chains undergo relaxations at different temperatures, partly due to the change in free volume and partly due to the change in kinetic energy. These relaxations necessarily cause a change in the structure: notably at the glass transition temperature (Tg), where alpha-relaxation processes dominate and the epoxy changes from a hard, brittle?glassy? form to a viscous, rubbery state. While existing macroscopic measurements provide an overview of these process they do not address the underlying physical mechanisms, and a microscopic probe allows observation of these process at a molecular level. We have observed a change in the Muon response at temperatures that align with alpha, beta and gamma relaxation regimes across a broad temperature range (50 K to 425 K) as well as changes in both the diamagnetic and Muonium fractions in T20 and longitudinal field (T1) scans. We have determined estimates for the Tg at several B fields and calculated activation energies from Arrhenius plots of ln (T1) vs 1 /T and seen evidence for the gamma and beta relaxations (and determined a preliminary value for the gamma activation enrgy). These are in good agreement with values obtained from macroscopic measurements, However, in each case more data is necessary to reduce errors.
Principal Investigator: Mr Benjamin Orton
Local Contact: Dr Stephen Cottrell
DOI: 10.5286/ISIS.E.RB2500045
ISIS Experiment Number: RB2500045
| Part DOI | Instrument | Public release date | Download Link |
|---|---|---|---|
| 10.5286/ISIS.E.RB2500045-1 | EMU | 04 August 2028 | Download |
Publisher: STFC ISIS Neutron and Muon Source
Data format: RAW/Nexus
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Data Citation
The recommended format for citing this dataset in a research
publication is as:
[author], [date], [title], [publisher],
[doi]
For Example:
Mr Benjamin Orton et al; (2025): Molecular dynamics of a catalysed epoxy resin (DGEBA) as a function of temperature, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB2500045
Data is released under the CC-BY-4.0 license.
