Comonomer Compositional Distribution and Thermal Characteristics of Bacterially Synthesized Poly(3‐hydroxybutyrate‐co‐3‐hydroxyhexanoate)s
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TL;DR: In this article, the authors investigated the compositional dependence of thermal properties of poly(3-hydroxybutyrate-co-3 -hydroxyhexanoate) with different comonomer composition.
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Abstract: The comonomer composition and its distribution have been investigated for poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) [P(3HB-co-3HH)], which was bacterially synthesized by Ralstonia eutropha from coconut oil as a carbon source. Using a chloroform/heptane mixed solvent, they were fractionated into several fractions with different comonomer composition. Bacterially synthesized P(3HB-co-3HH)s were found to have a wide compositional distribution. Using the fractions with a narrower comonomer composition distribution, the compositional dependence of thermal properties was investigated. The differential scanning calorimetry (DSC) melting behavior of a sample of unfractionated P(3HB-co-3HH) did not reflect that of fractions with similar average 3HH content. It was concluded that each of the fractions affects the thermal properties of the original unfractionated P(3HB-co-3HH), which should therefore be considered as polymer blends.
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Citations
The chemomechanical properties of microbial polyhydroxyalkanoates
TL;DR: In this article, a review comprehensively covers current understanding with respect to PHA biosynthesis and crystallinity, and the effect of composition, microstructure and supramacromolecular structures on chemomechanical properties.
576
Direct AFM Observation of Crystal Twisting and Organization in Banded Spherulites of Chiral Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)
Jun Xu,Baohua Guo,Zeng-Min Zhang,Jianjun Zhou,Yong Jiang,Shouke Yan,Lin Li,Qiong Wu,Guo-Qiang Chen,Jerold M. Schultz +9 more
TL;DR: In this paper, the development details of single lamellae in the banded spherulites are revealed for the first time, and they exhibit complicated growth behaviors: twisting, bending, backward growth, and branching.
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Biosynthesis and characterization of polyhydroxyalkanoate containing high 3-hydroxyhexanoate monomer fraction from crude palm kernel oil by recombinant Cupriavidus necator.
TL;DR: The results of various characterization analyses revealed that the copolymers containing a high 3HHx monomer fraction demonstrated soft and flexible mechanical properties.
118
Bio-composite of bacterial poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) reinforced with vegetable fibers
TL;DR: In this paper, composites of a bacterial copolyester poly(3-hydroxybutyrate-co-3hydroxyhexanoate) with flax fibers were investigated and the best results were obtained with surface acetylated fibers.
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Patent
Molded or extruded articles comprising polyhydroxyalkanoate copolymer and an environmentally degradable thermoplastic polymer
Jean Jianquin Cincinnati Zhao,Isao Noda,Gary Wayne Gilbertson,Drew C. McAvoy,Brian Francis Gray,David Harry Melik +5 more
- 23 Apr 2004
TL;DR: In this article, annealing cycle times for a mixture of polyhydroxyalkanoate copolymer and an environmentally degradable thermoplastic polymer or copolymers are disclosed.
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