Spatial distribution, fracture density

Under defined conditions, the toughness is also driven by the content and spatial distribution of the -nucleating agent. The increase in fracture resistance is more pronounced in PP homopolymers than in random or rubber-modified copolymers. In the case of sequential copolymers, the molecular architecture inhibits a maximization of the amount of the /1-phase in heterophasic systems, the rubber phase mainly controls the fracture behavior. The performance of -nucleated grades has been explained in terms of smaller spherulitic size, lower packing density and favorable lamellar arrangement of the /3-modification (towards the cross-hatched structure of the non-nucleated resin) which induce a higher mobility of both crystalline and amorphous phases. 

The main conclusions drawn from the small-and large-scale analyses of the studied rock mass are that for this data set, the uncertainty in the mechanical properties and their spatial variations are the most important factors in performance assessment of deep waste disposal, followed by the uncertainty of the fracture density and the spatial distribution of the fracture density. 

---