On the Composites Based on Epoxy Resin - Progress in Organic and Physical Chemistry: Structures and Mechanisms - page 175

The curves on the Figure 1 show that at increasing of ¿ ller (diatomite) concentra-
tion in the composites the density of materials essentially depends on both of diatomite
contain and on the degree of concentration of modify agent TEOS. Naturally the de-
creasing of density of composites at increasing of ¿ ller concentration is due to increas-
ing of micro empties because of one's localized in the ¿ ller particles (Figure 1, curve
1). The composites with modi¿ ed by TEOS diatomite contain less amount of empties
as they are ¿ lled with modify agent (Figure 1, curves 2 and 3).
FIGURE 1 Dependence of the density of the composites based on epoxy resin on the
concentration of unmodified (1), modified by 3% (2), and 5 mass % (3) tetraethoxysilane
diatomite.
The dependence of ultimate strength on the content of diatomite (modi¿ ed and
unmodi¿ ed) presented on the Figure 2 shows that it has an extreme character. How-
ever, the positions of corresponding curves maximums essentially depend on amount
of modi¿ ed agent TEOS. The general view of these dependences is in full conformity
with well known dependence of ı C [8]. The sharing of the maximum of curve for
composites containing 5% of modi¿ ed diatomite from the maximum for the analogous
composites containing 3% modi¿ er to some extent is due to increasing of the amount
of the bonds between ¿ ller particles and macromolecules at increasing of the concen-
tration of the ¿ ller.