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- W2000384224 abstract "Immobilized Lipase B from Candida antartica (Novozyme 435) catalyzed bulk polycondensations at 70 °C for 42 h that resulted in hyperbranched polyesters with octanediol-adipate and glycerol-adipate repeat units. Instead of using organic solvents, the monomers adipic acid (A2), 1,8-octanediol (B2), and glycerol (B‘B2) were combined to form monophasic ternary mixtures. During the first 18 h of a copolymerization with monomer feed ratio (A2 to B2 to B‘B2) 1.0:0.8:0.2 mol/mol, the regioselectivity of Novozyme 435 resulted in linear copolyesters. Extending the reaction to 42 h gave hyperbranched copolymers with dendritic glycerol units. The % regioselectivity for esterifications at the primary glycerol positions ranged from 77 to 82% and was independent of glycerol content in the monomer feed. Variation of glycerol in the monomer feed gave copolymers with degree of branching (DB) from 9 to 58%. In one example, a hyperbranched copolyester with 18 mol % glycerol−adipate units was formed in 90% yield, with Mw 75 600 (by SEC-MALLS), Mw/Mn 3.1, and DB 19%. Generalized structures were created to depict that for hyperbranched glycerol copolyesters and the progression of products formed at reaction times from 5 min to 42 h." @default.
- W2000384224 created "2016-06-24" @default.
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- W2000384224 date "2005-03-19" @default.
- W2000384224 modified "2023-09-27" @default.
- W2000384224 title "Glycerol Copolyesters: Control of Branching and Molecular Weight Using a Lipase Catalyst" @default.
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- W2000384224 doi "https://doi.org/10.1021/ma0480190" @default.
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