Chemistry Reference
In-Depth Information
FIGURE 14.6
The dependences of elasticity modulus
E
(1) and fracture stress sf
f
(2) on
extrusion draw ratio l for componors UHMPE - bauxite [44].
The authors number was offered earlier [43] the new method of polym-
erization-filled compositions on the basis of UHMPE processing - powder
billet ram extrusion, allowing to prepare rod-like products with mechanical
properties high level. The studies, carried out on systems UHMPE-kaolin,
UHMPE-Al, shown [2], that at large draw ratios l a componors strengthen-
ing reduction occurs. The obtained result comparison with the data by ex-
trudates UHMPE and its compositions with smaller kaolin contents fracture
[43] allows to suppose, that fracture stress extreme change can be connected
with the filler availability. The Ref. [44] is devoted to this question clarifica-
tion.
As and in the case [45], the studied componors fracture stress sf
f
depend-
ing on l changes extremely and similarly o elasticity modulus E, reaching
the greatest values in the region of l ≈ 5 (Fig. 14.6) at bauxite content 40
mas. %. The maximum for componors UHMPE-Al with Al content 70 mas.
% is disposed at smaller l values that at the same filler content 54 mas. %
[45]. Hence, at filler contents increase strengthening reduction process is
displayed earlier (at smaller l). The l increasing induces also extrudates
