ABSTRACT
Figure 4.4: Sketch of the carbon skeleton of an example of Basic Structural Un it (BSU) , the bui ld ing b lock {or most polyaromatic sol ids .
Aromatics 0
rate of release
Temp.
Temp.
- ViSCOELASTI C � � BRITTLE SOUD Figure 4.7: a) Sketch of the viscos i ty (sol id l ine) and evolution of the quinoleine insoluble fraction content (dashed l ine) of a thermoplastic carbon precursor during the primary carboni sation; b) rate of volati le matter release, showing the maximum at T LMO' (From van Krevelen, 1 96 1 , by permission of Elsevier.)
Figure 4.8: Example of two different behaviours as compared to the one sketched in Figure 4 . 7 a. Bold curves: precursor with a high O/H atomic ratio. Thin curves : precursor with a low O/H atomic ratio. (From Barhia et a/. , 1 986 , by permission of Elsevier. )
�(A) a
On the other hand, owing to the averaging effect of the method, the textural state of polyaromatic solids can only be accurately gauged to reveal possible anisotropies when the anisotropic volume is of the same o rder as the volume analysed.
