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phase structure of polymer blends. Dependence “melt viscosity tempera-
ture” were investigated for all compositions. The viscosity values at vari-
ous temperatures for blends of polymers with different ratios are shown
in Fig. 4.5.
FIGURE 4.5
The viscosity values at various temperatures for blends of polymers with
different ratios.
The viscosity values of the composition decreases considerably with
increasing temperature and increasing the content of PHB that gives the
chance regulation of technological properties of compositions in a wide
range. Based on the significant difference of the solubility parameters cal-
culated previously [6], it seems reasonable assumption on the formation of
a biphasic system melts of mixtures of these polymers. The assumption of
formation of two-phase mixtures of melts of these polymers seems justi-
fied based on significant difference in the solubility parameters, which cal-
culated previously [6]. Kerner-Takayanagi equation applicable to describe
the rheological properties of two-phase mixtures of polymers [1]:
