Improving mechanical properties and processability of a very high T g epoxy amine network via anti‐plasticizer fortification

Samuel R. Swan, Houlei Gan, Claudia Creighton, James M. Griffin, Bekim V. Gashi, Russell J. Varley

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Abstract

Abstract: In this work, molecular fortifiers are added to a highly aromatic and rigid epoxy monomer bis(2,7 diglycidyl ether naphthalenediol) methane (NNE) possessing a very high glass transition temperature (Tg) when cured with 4,4′‐diaminodiphenyl sulfone (DDS) to explore their impact upon mechanical and thermal properties and reactivity. The molecular fortifiers used are the nonfunctional naphthalene (NAPH), the reactive diluent o‐cresyl glycidyl ether (CGE) and an adduct of dihydroxy naphthalene and CGE (molecular fortifier naphthalene, MFN), a variant on the partially reacted substructures approach. The fortifiers are found to affect NNE/DDS reactivity and increase processability depending upon their propensity to attach to the network either through hydrogen bonding or pi‐pi electron interactions. Thermal analysis shows that the fortifiers increased cure conversion although the Tgs of the networks were generally unaffected until higher levels of addition. The fortifiers reduce moisture ingress and suppress glassy state β relaxations while increasing modulus significantly. Although there is little improvement in toughness overall, some evidence for higher fracture toughness is observed for the MFN and NAPH modified networks. This work highlights the effectiveness of different molecular level fortifiers on improving properties, in particular the rigidity of highly crosslinked networks.
Original languageEnglish
Article number52854
Number of pages13
JournalJournal of Applied Polymer Science
Early online date25 Jul 2022
DOIs
Publication statusE-pub ahead of print - 25 Jul 2022

Bibliographical note

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Funder

Australian Research Council, Grant/Award Numbers: DP220100130, IH210100023

Keywords

  • mechanical properties
  • resins
  • structure–property relationships
  • viscosity and viscoelasticity

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