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Benzo-12-crown-4 modified N -heterocyclic carbene for organocatalyst: Synthesis, characterization and degradation of block copolymers of ϵ-caprolactone with L -lactide.
- Source :
-
Journal of Macromolecular Science: Pure & Applied Chemistry . 2016, Vol. 53 Issue 6, p374-381. 8p. - Publication Year :
- 2016
-
Abstract
- A set of poly(L-lactide)-poly(ϵ-caprolactone) diblock copolymers (AB) and poly(L-lactide)-poly(ϵ-caprolactone)-poly(L-lactide) triblock copolymers (ABA) with predictable molecular weights and relatively narrow distributions were synthesized by ring-opening polymerization of successively added ϵ-caprolactone (ϵ-CL) andL-lactide (LLA) using 4-methyl benzo-12-crown-4 imidazol-2-ylidene as catalyst. The effects of polymerization conditions, such as reaction time, temperature, monomer/catalyst molar ratio and monomer concentration on the copolymerization have been discussed in detail. The resulting copolymers were characterized by1H-NMR,13C-NMR, IR, GPC and DSC methods which confirmed the successful synthesis of block copolymers of LLA and ϵ-CL. Hydrolytic degradation of the polymers showed that the PLLA-PCL-PLLA copolymer exhibited faster degradation as compared with the PCL homopolymer in alkaline medium at 37°C. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10601325
- Volume :
- 53
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- Journal of Macromolecular Science: Pure & Applied Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 114514179
- Full Text :
- https://doi.org/10.1080/10601325.2016.1166004