Results 201 to 210 of about 18,639,392 (237)
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Carboxylate-Induced Degradation of Poly(3-hydroxybutyrate)s
Biomacromolecules, 2007This communication shows that thermal degradation of poly(3-hydroxybutyrate)s (PHBs) is induced by carboxylate groups via a newly proposed E1cB mechanism. In PHBs with end groups in the form of carboxylic acid salts with Na+, K+, and Bu4N+ counterions, the proposed mechanism explains the dependence of thermal stability on the size of the counterion ...
M. Kawalec +6 more
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Journal of Polymer Science Part B: Polymer Physics, 2004
AbstractThe thermal behavior and intermolecular interactions of blends of poly(3‐hydroxybutyrate) (PHB) and maleated PHB with chitosan were studied with differential scanning calorimetry, Fourier transform infrared (FTIR), wide‐angle X‐ray diffraction (WAXD), and X‐ray photoelectron spectroscopy (XPS).
Cheng Chen +3 more
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AbstractThe thermal behavior and intermolecular interactions of blends of poly(3‐hydroxybutyrate) (PHB) and maleated PHB with chitosan were studied with differential scanning calorimetry, Fourier transform infrared (FTIR), wide‐angle X‐ray diffraction (WAXD), and X‐ray photoelectron spectroscopy (XPS).
Cheng Chen +3 more
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Microbiology, 2000
Recent data on the biosynthesis of poly(3-hydroxybutyrate) (PHB) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and its regulation in bacteria are reviewed, with special emphasis on the properties and regulation of the relevant enzymes and their genes.
Yu. A. Trotsenko, L. L. Belova
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Recent data on the biosynthesis of poly(3-hydroxybutyrate) (PHB) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and its regulation in bacteria are reviewed, with special emphasis on the properties and regulation of the relevant enzymes and their genes.
Yu. A. Trotsenko, L. L. Belova
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World Journal of Microbiology and Biotechnology, 2005
Production of poly(3-hydroxybutyric acid) [P(3HB)] by Rhodopseudomonas palustris SP5212 isolated in this laboratory has been optimized under phototrophic microaerophilic conditions. Cells grown in malate medium accumulated 7.7% (w/w) P(3HB) of cellular dry weight at the early stationary phase of growth. The accumulated P(3HB) however, attained 15% (w/w)
Mahuya Mukhopadhyay +2 more
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Production of poly(3-hydroxybutyric acid) [P(3HB)] by Rhodopseudomonas palustris SP5212 isolated in this laboratory has been optimized under phototrophic microaerophilic conditions. Cells grown in malate medium accumulated 7.7% (w/w) P(3HB) of cellular dry weight at the early stationary phase of growth. The accumulated P(3HB) however, attained 15% (w/w)
Mahuya Mukhopadhyay +2 more
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Polymer, 2001
Abstract The competition between cocrystallization and phase segregation in blends of poly(3-hydroxybutyrate) (PHB) and poly(3-hydroxybutyrate- co -3-hydroxyvalerate) (PHB–HV) containing 9 and 15% HV has been studied by 13 C cross-polarization magic-angle sample spinning (CPMAS) NMR and DSC techniques. The PHB homopolyester samples with selectively
Miwa Saito, Yoshio Inoue, Naoko Yoshie
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Abstract The competition between cocrystallization and phase segregation in blends of poly(3-hydroxybutyrate) (PHB) and poly(3-hydroxybutyrate- co -3-hydroxyvalerate) (PHB–HV) containing 9 and 15% HV has been studied by 13 C cross-polarization magic-angle sample spinning (CPMAS) NMR and DSC techniques. The PHB homopolyester samples with selectively
Miwa Saito, Yoshio Inoue, Naoko Yoshie
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Polymer Degradation and Stability, 1994
Poly(3-hydroxybutyrate) {P(3HB)} and the copolymer poly(3-hydroxybutyrate-co-3-hydroxyvalerate) {P(3HB-co-3HV)} were irradiated with γ-rays at 25°C in air and in vacuum. Melting points (Tm) and glass-transition temperatures (Tg) were measured by differential scanning calorimetry.
Hiroshi Mitomo +3 more
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Poly(3-hydroxybutyrate) {P(3HB)} and the copolymer poly(3-hydroxybutyrate-co-3-hydroxyvalerate) {P(3HB-co-3HV)} were irradiated with γ-rays at 25°C in air and in vacuum. Melting points (Tm) and glass-transition temperatures (Tg) were measured by differential scanning calorimetry.
Hiroshi Mitomo +3 more
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Journal of Applied Polymer Science, 1999
Water sorption and diffusion have been investigated in poly(3-hydroxybutyrate) (PHB) and three poly(3-hydroxybutyrate-co-3-hydroxyvalerate) copolymers [P(HB-HV)] by means of a Cahn electromicrobalance. Permeability of these samples have been determined using a gravimetric permeation cell.
O. Miguel, J. J. Iruin
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Water sorption and diffusion have been investigated in poly(3-hydroxybutyrate) (PHB) and three poly(3-hydroxybutyrate-co-3-hydroxyvalerate) copolymers [P(HB-HV)] by means of a Cahn electromicrobalance. Permeability of these samples have been determined using a gravimetric permeation cell.
O. Miguel, J. J. Iruin
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Journal of Applied Polymer Science, 1999
CO 2 sorption and diffusion in poly(3-hydroxybutyrate) and three poly(3-hydroxybutyrate-co-3-hydroxyvalerate) copolymers were investigated gravimetrically at temperatures from 25° to 50°C and pressures up to 1 atm. The sorption behavior proved to be linear for all the copolymers studied.
O. Miguel, T. A. Barbari, J. J. Iruin
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CO 2 sorption and diffusion in poly(3-hydroxybutyrate) and three poly(3-hydroxybutyrate-co-3-hydroxyvalerate) copolymers were investigated gravimetrically at temperatures from 25° to 50°C and pressures up to 1 atm. The sorption behavior proved to be linear for all the copolymers studied.
O. Miguel, T. A. Barbari, J. J. Iruin
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Journal of Applied Polymer Science, 2001
AbstractThe thermal degradation of poly(3‐hydroxybutyrate) (PHB) and poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) [P(HB‐HV)] was studied using thermogravimetry (TG). In the thermal degradation of PHB, the temperature at the onset of weight loss (To) was derived by To = 0.97B + 259, where B represents the heating rate (°C/min).
Si‐Dong Li +2 more
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AbstractThe thermal degradation of poly(3‐hydroxybutyrate) (PHB) and poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) [P(HB‐HV)] was studied using thermogravimetry (TG). In the thermal degradation of PHB, the temperature at the onset of weight loss (To) was derived by To = 0.97B + 259, where B represents the heating rate (°C/min).
Si‐Dong Li +2 more
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Biodegradable Poly(3‐hydroxybutyrate) Nanocomposite
Macromolecular Symposia, 2009AbstractThis work seeks bringing a technological and social contribution by searching blends and composites of poly(3‐hydroxybutyrate) (PHB) and polyethylene widely used in packaging films, and colloidal silica. The mixtures were prepared by extrusion using a single‐screw extruder and were analyzed regarding their thermal and mechanical properties and ...
Eiji Ohashi +6 more
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