Hyperbranched Polyglycerols with Elevated Molecular Weights: A Facile Two-Step Synthesis Protocol Based on Polyglycerol Macroinitiators

Autor:	Daniel Wilms, Ulrike Kemmer-Jonas, Holger Frey, Frederik R. Wurm, Jörg Nieberle, Paul Böhm
Rok vydání:	2009
Předmět:	chemistry.chemical_classification Polymers and Plastics Molecular mass Organic Chemistry Glycidol Epoxide Polymer Ring-opening polymerization Inorganic Chemistry chemistry.chemical_compound Anionic addition polymerization chemistry Polymerization Polymer chemistry Materials Chemistry Molecule
Zdroj:	Macromolecules. 42:3230-3236
ISSN:	1520-5835 0024-9297
Popis:	Hyperbranched polyglycerol (PG) is established as one of the few hyperbranched polymers that offer the possibility to control molecular weight up to Mn = 6000 g/mol. This work introduces a facile 2-step strategy that relies on the use of a low molecular weight PG (Mn = 500 and 1000 g/mol) as a macroinitiator for the slow addition of glycidol, permitting to overcome previous limitations concerning molecular weights and molecular weight control. A systematic investigation of the effect of the degree of deprotonation on the control of the polymerization reaction has been carried out. A series of hyperbranched PGs with molecular weights up to Mn = 24000 g/mol has been obtained under fully controlled conditions. The polydispersities of the samples prepared were in the range of 1.3 to 1.8. In summary, we present the first example of a synthetic strategy for a hyperbranched polymer that is now accessible over a broad range of molecular weights (300−24000 g/mol) without the ubiquitous problem of large polydispers...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ac6e10e9007419cdfac153e5689131ae https://doi.org/10.1021/ma802701g Zobrazit plný text záznamu