Chemistry Reference
In-Depth Information
The polymerization of isoprene in the presence of fractions I and II
of C-1 (method 1) occurs on site of types B and C
(Fig. 3.3). The polym-
erization in the presence of fraction III proceeds on active site of type A
only. The single site and low activity character of the catalyst composed
of particles of fraction III is typical of all the studied catalysts and all the
methods of their preparation. Thus, these curves are not shown in subse-
quent figures. Catalyst C-2 prepared via method 1 likewise features the
presence of type B
and type C
site in isoprene polymerization on fractions
I and II (Fig. 3.4). The hydrodynamic action (method 2) on C-1 accompa-
nied by dispersion of particles of fraction I does not change the types of
site of polymerization on particles of fraction II (Fig. 3.5). A similar trend
is observed during the same action on a DPO-containing titanium catalyst
in turbulent flows (Fig. 3.5).
FIGURE 3.3
Active site distributions over kinetic heterogeneity during isoprene
polymerization on fractions C-1. Method 1. Here and in Figs. 3.4 and 3.5 numbers next to
the curves are conversions (%).
