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Synthesis and Characterization of Poly(3-hydroxybutyrate) and Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) Polymer Mixtures Produced in High-Density Fed-Batch Cultures of Ralstonia eutropha (Alcaligenes eutrophus)
- Source :
- Macromolecules; August 1998, Vol. 31 Issue: 17 p5660-5667, 8p
- Publication Year :
- 1998
-
Abstract
- Alternate feeding of glucose and propionic acid to phosphate-depleted batch cultures of Ralstonia eutropha (reclassified from Alcaligenes eutrophus) produced poly(3-hydroxybutryate-co-3-hydroxyvalerate) [P(3HB-co-3HV)] with thermal properties markedly different from random copolymers of similar monomer content. These polymers exhibited a single glass transition and a single melting peak that was significantly higher than expected for a random copolymer. The polymers were found, by solvent fractionation and NMR, to be a mixture of poly(3-hydroxybutyrate) [P(3HB)] and a random copolymer, P(3HB-co-3HV). When compared with random copolymers of similar monomer content, the polymers produced by alternate substrate feeding displayed no improvement in mechanical properties and possessed similar aging characteristics.
Details
- Language :
- English
- ISSN :
- 00249297 and 15205835
- Volume :
- 31
- Issue :
- 17
- Database :
- Supplemental Index
- Journal :
- Macromolecules
- Publication Type :
- Periodical
- Accession number :
- ejs1146583