Chain extension of polyesters PET and PBT with two new diimidodiepoxides. II

Tuning the Rheological, Thermal, and Solid-State Properties of Branched PLA by Free-Radical-Mediated Reactive Extrusion

“…The corresponding M–H plots (Figure c) deviated from the linear fit beyond M w = 10 5 g mol –1 suggesting that the intrinsic viscosity decreased in the high-molar-mass region, with respect to the linear polymer. This is consistent with the formation of branched structures, as reported in PLA and other polyesters. ,− …”

Microcellular injection molding of in situ modified poly(ethylene terephthalate) with supercritical nitrogen

“…It can be noticed that, both of the crystallization and melting behaviors of modified PETs are changed by the introduction of modifying monomers PENTA and PMDA compared with unmodified PET. The corresponding numerical values of temperatures and enthalpies of modified PETs are obviously reduced which is in agreement with that reported elsewhere . A somewhat lower of T c suggests that the crystallization of modified PETs becomes more difficult, i.e., the branched structures and entanglement networks of modified PET macromolecules caused by introducing modifying monomers prohibit the crystallization, making it possible at a lower temperature.…”

Chain extension of poly(ethylene terephthalate) by reactive blending using diepoxides

“…Comparing the intrinsic viscosities and carboxyl contents of the products of this work with those obtained with custom‐made diepoxides 18, 19 or heterocyclic bifunctional compounds, 10–15 it is seen that the diepoxides employed in this study are less effective in chain‐extending reactions. However, our results were obtained employing low‐cost commercially available materials, which was the major scope of this work.…”