Melt Processing
Reactions were carried out in a Brabender batch
mixer, (model PL2000) on predried materials under
nitrogen atmosphere at 60 rpm. Bowl temperature
was set at 280°C. Pre-weighed dried PET pellets were
first added in the intensive mixer and after melting
the modifier was added, approximately 5-6 minutes
later. Temperature and torque were continuously
monitored. Mixing continued for an additional 2 to 10
min time period depending on the particular system.
0.1 wto/o of Sb,03, added in some runs in attempts to
prevent further torque decrease through its expected
catalytic effect, produced no apparent differences. PET
pellets in the absence of modifiers were also run for
15 minutes as controls. Details on mixing times and
sequence of addition are included in Tables 3-5. In
the representation of the total mixing time, modifiers
and Sb203 were added after the completion of the first
and the second time interval, respectively.
Melt ProcessingReactions were carried out in a Brabender batchmixer, (model PL2000) on predried materials undernitrogen atmosphere at 60 rpm. Bowl temperaturewas set at 280°C. Pre-weighed dried PET pellets werefirst added in the intensive mixer and after meltingthe modifier was added, approximately 5-6 minuteslater. Temperature and torque were continuouslymonitored. Mixing continued for an additional 2 to 10min time period depending on the particular system.0.1 wto/o of Sb,03, added in some runs in attempts toprevent further torque decrease through its expectedcatalytic effect, produced no apparent differences. PETpellets in the absence of modifiers were also run for15 minutes as controls. Details on mixing times andsequence of addition are included in Tables 3-5. Inthe representation of the total mixing time, modifiersand Sb203 were added after the completion of the firstand the second time interval, respectively.
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