Polyaryletherketone (PAEK) Thermoplastic Composites Via In-Situ Ring Opening Polymerisation
Polymer Science and Engineering
This work investigates the synthesis and characterisation of macrocyclic oligomers (MCO) from 4, 4′-difluoro benzophenone and catechol, their ring opening polymerisation, fabrication into carbon fibre reinforced composite materials and depolymerisation. The MCOs are polymerized using Caesium fluoride at a variety of temperatures, times, and catalyst concentrations to produce ortho polyaryletherketone polymers (oPAEK) of varying glass transition temperature (Tg) and molecular weight. A dimer formed during synthesis which does not polymerise is removed enabling a more convenient synthesis using lower temperature and catalyst concentration. The first carbon fibre composite of oPAEK fabricated using in-situ ring opening polymerisation methods is therefore presented with and without MCO dimer. Composites made without dimer formed are able fabricated at 10 °C lower temperature than the corresponding MCO containing dimer and have improved thermal and mechanical properties. Depolymerisation of the MCO and the re-emergence of cyclic structures is reported, highlighting the reversible nature of the chemistry. The results presented here provide important guidance on the future development of in-situ polymerisation of high performance thermoplastic composites.
Composites Science and Technology
Misasi, J. M.,
Dao, B. N.,
Swan, S. R.,
Wiggins, J. S.,
Varley, R. J.
(2021). Polyaryletherketone (PAEK) Thermoplastic Composites Via In-Situ Ring Opening Polymerisation. Composites Science and Technology, 201.
Available at: https://aquila.usm.edu/fac_pubs/18522