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A novel method for the measurement of coal swelling in organic solvents, based on the measurement of particle size distributions, is presented. The technique is unusual in that there is a self-diagnostic feature, whereby if any of the assumptions on which the method rests are not fulfilled by a particular sample, this fact becomes apparent when the results are analysed. Two variants of the technique...
Unidirectional, pitch-based-matrix composites fabricated from PAN-based Courtaulds fibres were oxidised in air at temperatures of 420 and 730°C to low extents of burn-off (less than 3.5%). Material loss occurred primarily at fibre-matrix interfaces at the edge regions of the composites and, in the case of the lower temperature heat-treated materials, in the areas close to internal pores and cracks...
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