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Solid particle erosion of epoxy resin (EP) modified by various amounts of hygrothermally decomposed polyester-urethane (HD-PUR) was studied at oblique (30, 45, and 60 o ) and normal impact (90 o ). The cross-linked structure of the modified EP was characterised by the mean molecular weight between cross-links (M c ). It was established that the initial brittle erosion of the...
Boron-substituted polyaromatic mesophases were synthesized by co-pyrolysis of a coal tar pitch with pyridine–borane using boron contents of 0.5 and 1%. After removal of residual isotropic material by extraction with tetrahydrofuran, the mesophases were milled to a particle size of d≤10 μm and compacted to bodies. These bodies were sintered at 1300°C and subsequently high-temperature treated at 1600,...
The synthesis of boron-substituted polyaromatic mesophase was studied by (1) co-pyrolysis of a filtered coal tar pitch with three different borane complexes, (2) pyrolysis of a boron-containing polymer produced by co-polymerisation of divinylbenzene with borane, and (3) pyrolysis of boron-substituted/crosslinked acenaphthylene, produced by hydroboronation of acenaphthylene. The pyrolyses were performed...
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