Copolymers ofrac-Lactide and ε -Caprolactone: Conventional Copolymerization vs. Macroinitiator Copolymerization

Autor:	Scott J. Moravek, Robson F. Storey
Rok vydání:	2009
Předmět:	Materials science Lactide Polymers and Plastics Comonomer General Chemistry Biodegradable polymer chemistry.chemical_compound Monomer chemistry Polymerization Polymer chemistry Materials Chemistry Ceramics and Composites Copolymer Glass transition Caprolactone
Zdroj:	Journal of Macromolecular Science, Part A. 46:339-345
ISSN:	1520-5738 1060-1325
Popis:	Copolymers of rac-lactide (rac-LA) and e -caprolactone (CL) were synthesized with tin(II) 2-ethylhexanoate and 1,4-butanediol at 130°C using two methods of copolymerization: conventional copolymerization and sequential polymerization using poly(CL) as a macroinitiator for rac-LA. Conventional copolymerizations showed a retarded rate of CL conversion until rac-LA reached high conversion. The macroinitiator method led to reduced overall reaction time to reach high conversion of both monomers. At a low CL comonomer ratio, the copolymers synthesized by the two different methods were very similar but, as the comonomer ratio was increased, differences in monomer sequencing (e.g. random vs. blocky) as determined by 13C-NMR and glass transition were observed. Additionally, macroinitiator synthesis carried out at 150°C in an effort to promote transesterification did not show any significant differences from the copolymer synthesized at 130°C.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ccdc4e5c1e626c6723aa333971741d00 https://doi.org/10.1080/10601320902720568 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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