1. Lipase-catalyzed synthesis and characterization of polymers by cyclodextrin as support architecture
- Author
-
Liu, Wenhui, Wang, Fang, Tan, Tianwei, and Chen, Biqiang
- Subjects
- *
LIPASES , *POLYMERIZATION , *CATALYSIS , *CYCLODEXTRINS , *GLYCOLS , *POLYESTERS , *ALIPHATIC compounds , *ORGANIC solvents - Abstract
Abstract: Diesters and diols were successfully converted into aliphatic polyesters by enzymatic lipase Candida sp.99-125 catalysis, with β-cyclodextrin acting as supporting architecture (in a similar way as chaperone proteins). No organic solvents were used. The polytransesterification was a much greener process, being solvent-free and without metal residues. Lipase Candida sp.99-125 showed a high catalytic activity for bulkpolymerization of diesters and diols with various numbers of methylene groups in their chains. β-Cyclodextrin encircled the linear polymer chain and maintained the chain in a proper configuration to avoid its coagulation. Lipase initiated the polymerization and β-cyclodextrin threaded onto the polymer chain to control the structure for producing high molecular weight polyesters. From a combination of diesters and diols, polyesters with a high molecular weight of 62,100Da were obtained at 70°C. The corresponding polyesters showed an excellent thermal stability till 350°C and had a strong ability to crystallize with up to 72% crystallinity, contributing to their high storage modulus. [Copyright &y& Elsevier]
- Published
- 2013
- Full Text
- View/download PDF