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- Title
Preparation, Characterization, and Microstructure of Poly(ε-caprolactone- co-2,2-dimethyltrimethylene carbonate) Using Metal-free Organocatalysts.
- Authors
Wang, Yan; Guo, Jizhe; Zhang, Lifang; Bai, Junhua; Niu, Jifang; Jiang, Lijuan; Li, Junfei
- Abstract
We investigated the random copolymerization of ε-caprolactone and 2,2-dimethyltrimethylene carbonate [poly( CL- co- DTC)] promoted by various imidazolium-based carbenes, including 1-isopropyl-3- p-methoxyphenylimidazol-2-ylidene [Catalyst ( 1)], 1-isopropy-3- p-methylphenylimidazol-2-ylidene [Catalyst ( 2)], and 1-methyl-3- p-methoxyphenyl-imidazol-2-ylidene [Catalyst ( 3)], all of which are new types of unsymmetrical N-heterocyclic carbene catalysts. The reaction was carried out in the presence of benzyl alcohol ( BnOH) as an initiator in tetrahydrofuran. By varying the experimental conditions and the monomer feed composition, poly( CL- co- DTC) with high yield and molecular weight was prepared using the binary system Catalyst ( 1)/ BnOH as catalyst/initiator. 1H NMR and differential scanning calorimetry ( DSC) characterizations verified random structures of the polymer. GPC characterization further showed high molecular weights and narrow molecular weight distribution of the final product.
- Subjects
COPOLYMERIZATION; MICROSTRUCTURE; CAPROLACTONES; CARBENES; ORGANOCATALYSIS; BENZYL alcohol
- Publication
Bulletin of the Korean Chemical Society, 2015, Vol 36, Issue 7, p1799
- ISSN
0253-2964
- Publication type
Article
- DOI
10.1002/bkcs.10340