Ring-opening precipitation polymerization of poly(D,L-lactide-co-glycolide) in supercritical carbon dioxide

Autor:	David D. Hile, Michael V. Pishko
Rok vydání:	1999
Předmět:	Supercritical carbon dioxide Materials science Polymers and Plastics Bulk polymerization Organic Chemistry Supercritical fluid extraction Supercritical fluid End-group Chain-growth polymerization Polymerization Chemical engineering Polymer chemistry Materials Chemistry Precipitation polymerization
Zdroj:	Macromolecular Rapid Communications. 20:511-514
ISSN:	1521-3927 1022-1336
Popis:	The biodegradable polymer poly(D,L-lactide-co-glycolide) was synthesized by a ring-opening precipitation polymerization in supercritical CO2 using stannous octoate as initiator. Following polymerization, unreacted monomer was removed by supercritical fluid extraction and the polymer was recovered as a porous solid upon depressurization of the CO2 phase. The lactide to glycolide ratio of the polymer was determined to be 70.7 : 29.3 using 13C NMR spectroscopy. The weight-average molecular weight of the product was measured to be 3 500, with a polydispersity of 1.4 using gel permeation chromatography.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::316152551485cafb0356b0ded78ab204 https://doi.org/10.1002/(sici)1521-3927(19991001)20:10<511::aid-marc511>3.0.co Zobrazit plný text záznamu Plný text