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Changes to the Mode I interlaminar fracture toughness, GIc, and fracture mechanisms of stitched and unstitched fibreglass/vinyl ester composites were investigated after exposure to elevated temperatures. The fibreglass was stitched through the thickness with Kevlar®-49 thread in two orientations with two stitch densities, and then resin transfer moulded with a cold-curing vinyl ester resin. After...
The dynamic mechanical behaviour of miscible, amorphous blends of poly(ether ether ketone) (PEEK) and poly(etherimide) (PEI) was studied over a wide temperature range incorporating the α transition and sub-T g transitions. The segmental motions responsible for the α process were significantly slowed by blending and were dominated by PEI. Fits of the data to the Kohlrausch-Williams-Watts...
A series of fluorinated polyetherketones containing perfluoroaryl moieties was prepared by solution condensation polymerization. The synthesis involves the condensation of a dialkali metal salt of a bisphenol with decafluorobenzophenone. The reaction is rapid, free of side reactions, and yields polymers with high glass transition temperatures (T g s) and excellent thermal stability. The...
The effects of solvent uptake on the relaxation behaviour, morphology and mechanical properties of poly(ether ether ketone) (PEEK), poly(etherimide) (PEI) and a 5050 PEEK/PEI blend have been investigated. Amorphous films were immersed in acetone at 25°C, 35°C and 45°C until equilibrium uptake was achieved. The films were then examined by wide angle X-ray scattering (WAXS), differential scanning...
Differential scanning calorimetry (d.s.c.), dynamic mechanical thermal analysis (d.m.t.a.) and dielectric relaxation spectroscopy (DRS) have been used to study the α-relaxation in amorphous blends of poly(ether ether ketone) (PEEK) and poly(ether imide) (PEI). The composition dependence of the d.s.c. T g is well described by the Couchman and Gordon-Taylor equations while the isothermal dielectric...
Solvent uptake in thin, amorphous samples of poly(ether ether ketone), poly(ether imide) and a 50 blend has been measured as a function of temperature. Diffusion coefficients, percentage weight increase and apparent activation energies have been calculated. The 50 blend shows anomalous diffusion behaviour which may be attributed to specific interactions between the homopolymers and density changes...
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