6533b7dbfe1ef96bd1271311
RESEARCH PRODUCT
Organobase-Catalyzed Synthesis of Multiarm Star Polylactide With Hyperbranched Poly(ethylene glycol) as the Core
Holger FreyMartina Schömersubject
LactideMaterials sciencePolymers and PlasticsOrganic ChemistrySize-exclusion chromatographyCondensed Matter Physicschemistry.chemical_compoundMonomerPolymerizationchemistryPolymer chemistryMaterials ChemistryCopolymerPhysical and Theoretical ChemistryGlass transitionThermal analysisEthylene glycoldescription
Multiarm star copolymers consisting of the polyether-polyol hyperbranched poly(ethylene glycol) (hbPEG) as core and poly(L-lactide) (PLLA) arms are synthesized via the organobase- catalyzed ring-opening polymerization of lactide using hbPEG as a multifunctional macroinitiator. Star copolymers with high molecular weights up to 792 000 g mol−1 are prepared. Detailed 2D NMR analysis provides evidence for the attachment of the PLLA arms to the core and reveals that the adjustment of the monomer/initiator ratio enables control of the arm length. Size exclusion chromatography measurements show narrow molecular weight distributions. Thermal analysis reveals a lower glass transition temperature, melting point, and degree of crystallization for the star-shaped polylactides compared to linear polylactide.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2011-10-10 | Macromolecular Chemistry and Physics |