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Study of the reactions occurring during melt mixing of poly(ethylene terephthalate) and polycarbonate
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1985
Year
Materials ScienceChemical EngineeringEngineeringPet BlocksPetrochemicalPolymer ScienceBisphenol-a PolycarbonatePolymer BlendPolymer ProcessingThermodynamicsChemistryPolymerization KineticsEthylene TerephthalatePolymer MeltPolymer AnalysisChemical KineticsPolymer ChemistryMelt Mixing
In this work the reactions taking place during melt mixing of bisphenol-A polycarbonate (PC) with poly(ethylene terephthalate) (PET) were studied by selective degradation of PC sequences, solubility tests, and IR spectroscopy. It was found that exchange reactions between PC and PET took place, contrary to what has been previously suggested by other authors. Kinetic constants were evaluated from intrinsic viscosity measurements of PET blocks. The reaction rate was slow when only the Sb catalyst (residues of the PET polymerization) were present, but it was significantly accelerated by the addition of Ti(OBu)4. In the presence of the latter catalyst, other side reactions, leading to discoloration and gas evolution, took place.