Enzymatic Synthesis of Poly(alkylene succinate)s: Influence of Reaction Conditions
| Autor: | Doris Pospiech, Karin Sahre, Andreas Korwitz, Daniel Flugrat, Anett Werner, Peter Friedel, Brigitte Voit, Renata Choińska, Dieter Jehnichen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Condensation polymer
Size-exclusion chromatography Bioengineering 02 engineering and technology 010402 general chemistry enzymatic polycondensation lcsh:Chemical technology 01 natural sciences Enzyme catalysis Catalysis Candida antarctica lcsh:Chemistry Adipate Polymer chemistry Chemical Engineering (miscellaneous) poly(butylene succinate) lcsh:TP1-1185 Molar mass biology Chemistry Process Chemistry and Technology Transesterification 021001 nanoscience & nanotechnology biology.organism_classification 0104 chemical sciences enzyme activity aliphatic polyester lcsh:QD1-999 0210 nano-technology |
| Zdroj: | Processes, Vol 9, Iss 411, p 411 (2021) Processes Volume 9 Issue 3 |
| ISSN: | 2227-9717 |
| Popis: | Application of lipases (preferentially Candida antarctica Lipase B, CALB) for melt polycondensation of aliphatic polyesters by transesterification of activated dicarboxylic acids with diols allows to displace toxic metal and metal oxide catalysts. Immobilization of the enzyme enhances the activity and the temperature range of use. The possibility to use enzyme-catalyzed polycondensation in melt is studied and compared to results of polycondensations in solution. The experiments show that CALB successfully catalyzes polycondensation of both, divinyladipate and dimethylsuccinate, respectively, with 1,4-butanediol. NMR spectroscopy, relative molar masses obtained by size exclusion chromatography, MALDI-TOF MS and wide-angle X-ray scattering are employed to compare the influence of synthesis conditions for poly(butylene adipate) (PBA) and poly(butylene succinate) (PBS). It is shown that the enzymatic activity of immobilized CALB deviates and influences the molar mass. CALB-catalyzed polycondensation of PBA in solution for 24 h at 70 °C achieves molar masses of up to Mw~60,000 g/mol, higher than reported previously and comparable to conventional PBA, while melt polycondensation resulted in a moderate decrease of molar mass to Mw~31,000. Enzymatically catalyzed melt polycondensation of PBS yields Mw~23,400 g/mol vs. Mw~40,000 g/mol with titanium(IV)n-butoxide. Melt polycondensation with enzyme catalysis allows to reduce the reaction time from days to 3-4 h. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|