The role of β relaxations in determining the compressive properties of an epoxy amine network modified with POSS and mono-functional epoxy resins

Larry Q. Reyes, Samuel R. Swan, Houlei Gan, Seyed Mohsen Seraji, Jane Zhang, Russell J. Varley

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)
6 Downloads (Pure)

Abstract

Presented here is an investigation into the glassy state molecular mobility of modified epoxy amine networks using sub-ambient β relaxations measured from dynamic mechanical relaxations and their relationship to compressive properties. Two classes of additives are used to modify the epoxy amine network, the first are bulky inorganic siloxane caged epoxy functional polysilsesquioxanes (POSS) and the second are mono-functional epoxy diluents. Different pre-reaction methods between the POSS and amine were used to maximise dispersion or improved covalent attachment within the epoxy amine network while the mono-functional epoxy diluents easily react into the network via simple blending. Despite the wide structural variations in modifier and result effects upon final structure, microstructure and properties, the glassy state molecular mobility as measured by sub-ambient β relaxations correlates strongly with changes in modulus and yield strain.

Original languageEnglish
Article number106873
Number of pages10
JournalPolymer Testing
Volume93
Early online date28 Sept 2020
DOIs
Publication statusPublished - Jan 2021
Externally publishedYes

Bibliographical note

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Funder

Funding Information:
Prof Russell J. Varley gratefully acknowledges support from The Australian Research Council ( DP180100094 ) and the ARC Future Fibre Hub ( IH140100018 ) for partial funding of this work.

Keywords

  • Beta relaxations
  • Compression
  • Epoxy/amine networks
  • Mono functional epoxy diluents
  • POSS

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics

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