New catalysts for poly(ethylene terephthalate)‐bisphenol a polycarbonate reactive blending

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The effects of various catalysts on the reactive blending of poly(ethylene terephthalate) (PET) and bisphenol A polycarbonate (PC) was investigated. The various catalysts employed for PET syntheses, Ti(OBu)4, SmL3, EuL3, Ca + Sb, CeAc3, Er(NO3)3·B12C4 and Tb (acac)3·diPy (where L is o‐formylphenolate; B12C4 is a crown ether, benzo‐12‐crown‐4; acac is acetylacetonate; and diPy is 2,2′‐dipyridyl) have shown a different catalytic activity toward exchange reactions. Solubility tests, in solvents able to separate unreacted PET and PC, and selective degradation of the PC segments, combined with 1H NMR spectroscopy and size exclusion chromatography, made it possible to order the catalysts according to their catalytic activity: Ti(OBu)4 ≫ SmL3 > EuL3 > Ca + Sb > CeAc3∼Er(NO3)·B12C4 > Tb (Acac)3·diPy ≈ 0.