## Abstract The sixโmembered lactide was polymerized using the ringโopening polymerization with lipase as a catalyst at a temperature between 80 and 130ยฐC in bulk to yield the corresponding polylactide with weightโaverage molecular weights of up to 126000. The most preferable conditions with respec
Lipase-catalyzed ring-opening polymerization of 1,3-dioxan-2-one
โ Scribed by Shiro Kobayashi; Hirofumi Kikuchi; Hiroshi Uyama
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 249 KB
- Volume
- 18
- Category
- Article
- ISSN
- 1022-1336
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โฆ Synopsis
Abstract
Enzymatic ringโopening polymerization of a 6โmembered cyclic carbonate, 1,3โdioxanโ2โone, was investigated by using lipase as catalyst in bulk. Supported lipase derived from Candida antarctica catalyzed the polymerization to give the corresponding aliphatic polycarbonate. Unchanged monomer was recovered in the absence of the enzyme or using an inactivated enzyme, indicating that the present polymerization proceeds through enzymatic catalysis.
๐ SIMILAR VOLUMES
To avoid the harmful effects of metallic residues in poly(1,4-dioxan-2-one) (PPDO) for medical applications, the enzymatic polymerization of 1,4-dioxan-2-one (PDO) was carried out at 60 ยฐC for 15 h with 5 wt % immobilized lipase CA. The lipase CA, derived from Candida antarctica, exhibited especiall
Lipase-catalyzed ring-opening bulk polymerizations of 3(S)-isopropylmorpholine-2,5-dione (IPMD) were investigated. Selected commercial lipases were screened as catalysts for IPMD polymerization at 100 8C. Polymerizations catalyzed with lipases PPL, PS, and CR result in IPMD conversions of about 50%,