Abstract
PET-type polymers have been prepared in the presence of a variety of potential branching agents, such as trimesic acid, and with the control of branching using an end-capping agent, benzyl alcohol. The polymers synthesized have been characterized by dilute solution viscometry, end group analysis, light scattering (Mw), DSC analysis, and melt rheology. One group of polyesters synthesized with increasing levels of brancher has absolute Mw values which increase from ∼10K to 350K Da, and yet despite this, all of the macromolecules display roughly the same limiting viscosity number. Furthermore, though the corresponding zero-shear rate melt viscosity increases with Mw, the values are far below those expected for analogous linear polymers of comparable Mw. A second group of polyesters synthesized with a fixed level of brancher and increasing levels of end-capper has a much narrower range of Mw values, ∼30K−100K Da, i.e. ∼3−15 times larger than that of a model linear PET. Despite this, these polymers have m...
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