One-pot synthesis of star-shaped aliphatic polyesters with hyperbranched cores and their characterization with size exclusion chromatography

Synthesis and characterization of star-shaped aliphatic polyesters with hyperbranched cores were presented. Bis-CL was prepared in a two-step synthesis from dis-cyclohexyl-4,4′-diol. The reaction mixtures were prepared with a standard high-vacuum technique, and the polymerizations were carried out in sealed glass ampules. The polymerization mixture was analyzed using H NMR spectroscopy. It was found that the SEC traces in the range of elution volumes of the precursor is related to star-shaped structures with a lower number of arms. The hydrodynamic volume of the star-shaped polymers is lower than that of their linear counterparts with the same molar masses. A MALDI-TOF analysis of the model reaction has given strong evidence for multibranched star formation.