Thermal history effects on crystallisation and melting of poly(3-hydroxybutyrate)

Gunaratne, L.M.W.K.; Shanks, Robert A.; Amarasinghe, Gandara

doi:10.1016/j.tca.2004.05.003

Cited by 114 publications

(86 citation statements)

References 34 publications

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“…Fermentation was conducted using a three-stage process in order to increase biomass densities and polymer accumulation, without triggering the substrate inhibition reported to occur at levels of fructose higher than 10 g L −1 [39]. Different oil concentrations (5,10,15,20, and 25% v/v) were evaluated for PHA synthesis during Stage 3. The control experiments, using fructose as the carbon source during the overall process, complemented the studies.…”

Section: Discussionmentioning

confidence: 99%

“…PHB biodegradability and biocompatibility make it an attractive material; however, its brittleness and limited degree of crystallinity have restricted its possible applications. The melting point of PHB (≈175 ∘ C) is also very close to its decomposition temperature (≈180 ∘ C), which creates challenges for thermal processing due to a narrow processing window [10]. Copolymers such as poly-(hydroxybutyrate-co-hydroxyvalerate) (PHBV) that contain (3)-hydroxybutyrate (3HB) and (3)-hydroxyvalerate (3HV) units in the chain show lower molecular weights and lower melting temperatures when compared to a PHB homopolymer.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Poly-(R-hydroxyalkanoates) byCupriavidus necatorATCC 17699 Using Mexican Avocado(Persea americana)Oil as a Carbon Source

Flores-Sánchez

López-Cuellar

Pérez-Guevara

et al. 2017

International Journal of Polymer Science

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Poly-R-hydroxyalkanoates (PHAs) are polymers produced by a vast number of bacterial species under stress conditions. PHAs exhibit different thermal and mechanical properties that depend on their molecular structure. In this work, PHAs were produced using avocado oil as the carbon source. Cupriavidus necator H16 was cultured in three-stage fermentation using fructose during the cell growth stages and avocado oil during the PHA synthesis stage. Different concentrations of avocado oil were used during the third stage to test the incorporation of various monomeric units into the PHAs. Biomass and PHA production were measured during the fermentation. DSC, FTIR, and gas chromatography analysis aided the PHA characterization. Different proportions of 3-hydroxyvalerate were present in the 3-hydroxybutyrate main chain depending on the concentration of avocado oil. The results suggest that avocado oil is a viable new substrate for PHA production.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis of Poly-(R-hydroxyalkanoates) byCupriavidus necatorATCC 17699 Using Mexican Avocado(Persea americana)Oil as a Carbon Source

Flores-Sánchez

López-Cuellar

Pérez-Guevara

et al. 2017

International Journal of Polymer Science

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“…The presence of these peaks is justified by the melting of crystals with different lamellar thickness and/or different crystal structures 26 . For this reason, on second heating scan, is drastically reduced, due to the controlled cooling and heating rates, which allowed the formation of crystals with higher homogeneity.…”

Section: Differential Scanning Calorimetrymentioning

confidence: 99%

Preparation and Characterization of Maleic Anhydride Grafted Poly(Hydroxybutirate-CO-Hydroxyvalerate) – PHBV-g-MA

et al. 2016

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“…It is widely believed that a liquid state has a great effect on the microstructures and properties of as-cast materials. Melt thermal treatment and melt superheating treatment have been widely explored and used in modifying the solidification microstructure and improving the mechanical or physical properties of various materials: metallic alloys [1][2][3], aerogel [4], and polyethylene [5]. But the exact mechanism is still not fully understood, and there are discrepancies in the explanations put forward [6].…”

Section: Introductionmentioning

confidence: 99%

Effect of liquid-liquid transition on solidification and wettability of Sn-0.7Cu-xBi solder

Li¹,

Zhao²,

Zhang³

et al. 2016

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The electrical resistivity-temperature curve (ρ-T ) of Sn-0.7Cu-xBi (wt.%) melts was measured, and anomalous changes were observed on the ρ-T curve at the temperature far above the corresponding liquidus. The results reveal that the melts have experienced a temperatureinduced liquid-liquid transition (LLT), and the transition is reversible after the first cycle heating. Based on the result of LLT, solidification experiments and spreadability testing were carried out on the Sn-0.7Cu-xBi alloy to investigate the effect of LLT on the solidification and wettability. The results show that the microstructure was refined, and the wettability was improved when the solder samples solidified from the melt experienced LLT.K e y w o r d s : Sn-0.7Cu-xBi solders, liquid-liquid transition, solidification, wettability

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Thermal history effects on crystallisation and melting of poly(3-hydroxybutyrate)

Cited by 114 publications

References 34 publications

Synthesis of Poly-(R-hydroxyalkanoates) byCupriavidus necatorATCC 17699 Using Mexican Avocado(Persea americana)Oil as a Carbon Source

Synthesis of Poly-(R-hydroxyalkanoates) byCupriavidus necatorATCC 17699 Using Mexican Avocado(Persea americana)Oil as a Carbon Source

Preparation and Characterization of Maleic Anhydride Grafted Poly(Hydroxybutirate-CO-Hydroxyvalerate) – PHBV-g-MA

Effect of liquid-liquid transition on solidification and wettability of Sn-0.7Cu-xBi solder

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