A Possible Means to Assist the Processing of PET, PTT and PBT

Blends of PET, PTT and PBT with the corresponding MCOs have lower melt viscosities than the pure polymers. This effect of MCOs on viscosity has the potential for exploitation in polymer fabrication and especially in the processing of composite materials. Thus, the blends can be more easily melt-processed than the pure polymers, and the MCOs can then subsequently be converted in situ into high-molar-mass polymers by ED-ROPs. No catalyst is needed for the ED-ROPs. It was shown that suitable polymer/MCO blends can be obtained directly by carrying out cyclo-depolymerizations at appropriate concentrations. Suitable polymer/MCO blends can also, almost certainly, be obtained by carrying out the original polyester syntheses at lower concentrations than normally used.