Poly(lactic acid) polymer stars built from early generation dendritic polyols

Genny E. Keefe, Jean-d'Amour K. Twibanire, T. Bruce Grindley, Michael P. Shaver*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A family of polymer stars has been prepared from early generation dendritic cores with four, six, and eight arms. Four dendritic cores were prepared from the sequential reaction of a multifunctional alcohol with a protected anhydride, followed by deprotection to afford two or three new alcohol functionalities per reactive site. These cores were used as initiators for the tin-catalyzed ring-opening polymerization of L-lactide and rac-lactide to afford isotactic and atactic degradable stars, respectively. Two series of stars were prepared for each monomer, either maintaining total molecular weight or number of monomer units per arm. The polymers were characterized by NMR spectroscopy, light-scattering gel-permeation chromatography, differential scanning calorimetry, and thermogravimetric analysis. Our results support previous work that suggests that the length of the arms dictates thermal properties rather than the total molecular weight of the star. Little effect was noted between aromatic and aliphatic cores, presumably due to the flexibility of the rest of the core molecule. We have shown that early generation dendrimers can serve as excellent core structures for building core-first polymer stars via the ring-opening of cyclic esters.

Original languageEnglish
Pages (from-to)392-397
Number of pages6
JournalCanadian Journal of Chemistry
Volume91
Issue number6
DOIs
Publication statusPublished - Jun 2013

Keywords

  • poly(lactic acid)
  • dendrimer
  • biodegradable polymer
  • synthesis
  • star polymer
  • thermal properties
  • DSC
  • TGA
  • HYDROLYTIC DEGRADATION
  • DENDRIMERS
  • CORES
  • ARMS

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