Influence
of cobalt complex on thermal properties of poly(ethylene terephthalate)/polycarbonate
blend |
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Authors: | Patricia S C Pereira L C Mendes M L Dias Lys Sirelli |
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Institution: | (1) Instituto de Macromoléculas Professora Eloisa Mano-IMA, Universidade Federal do Rio de Janeiro, UFRJ, Rio de Janeiro, Brazil, 21945-970, Centro de Tecnologia, Bloco J, Caixa Postal 68525, RJ |
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Abstract: | The effects of processing time
and concentration of cobalt acetylacetonate III complex in poly(ethylene terephthalate)/polycarbonate
reactive blending were investigated. The blend was prepared in an internal
mixer at 270°C, 60 rpm, at different processing times (5–20 min)
and catalyst concentration (0.00625–0.075 mass%). The reaction product
was evaluated by differential scanning calorimetry (DSC), thermogravimetry
(TG) and wide angle X-rays scattering (WAXS).
In general, the
DSC curves showed two glass transition temperatures (T
g’s)
close to each homopolymer, independent of the processing time and complex’s
concentration, suggesting the presence of two phases: one rich in PET and
other one rich in PC. In all cases, melting temperature (T
m),
cold crystallization temperature (T
cc)
and crystallinity degree (X
c)
were progressively reduced with blending conditions. The TG curves presented
two decays. The first one represented the PET rich phase and the other one
was related to the PC phase. The WAXS diffractograms showed that the Bragg’s
angle and interplanar spacing of PET remaining practically unchanged. |
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Keywords: | cobalt catalyst PET/PC blend reactive blending transesterification reaction |
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