Chemistry Reference
In-Depth Information
FIGURE 12.4
The dependences of microhardness of epoxy polymers
H
v
(1, 2) and loosely
packed matrix
l.m.
v
H
(3, 4) on the value of curing agent − oligomer ratio
K
st
for EP-2 (1, 3) and
EP-2-200 (2, 4).
Hence, in the present chapter the Hill and Marsch equations fractal ana-
logs are obtained, which has shown, that cross-linked epoxy polymers mi-
crohardness is defined by their structure only, characterized by its fractal
dimension. Tabor's criterion is only fulfilled for Euclidean (or close to them)
solids. The cross-linking degree enhancement results to loosely packed ma-
trix loosening and corresponding reduction of cross-linked epoxy polymers
microhardness. The similar results obtained for linear polyethylene and
nanocomposites on its basis, filled with organoclay [16].
KEYWORDS
•
elasticity
•
epoxy polymer
•
Hill equation
•
Marsh equation
•
microhardness
•
Tabor's criterion
