Results 251 to 260 of about 54,789 (273)
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Photodegradation of poly(3-hydroxybutyrate)
Polymer Degradation and Stability, 2010Abstract The effect of ultraviolet radiation on the properties of poly(3-hydroxybutyrate) (PHB) was studied. The PHB investigated is produced from microbial fermentation using saccharose from sugarcane as the carbon source to the bacteria. The material was exposed to artificial UV-A radiation for 3, 6, 9 and 12 weeks.
Roberta K. Sadi +2 more
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Thermochimica Acta, 2006
Abstract With the objective of developing new biodegradable materials, the miscibility and the crystallinity of blends of poly(3-hydroxybutyrate), P(3HB), and poly(3-hydroxybutyrate-co-3-hydroxyvalerate), P(3HB-co-3HV), have been studied. P(3HB) (300 kg mol−1)/P(3HB-co-3HV)–10% 3HV (340 kg mol−1) blends were prepared by casting in a wide range of ...
D.S. Conti +3 more
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Abstract With the objective of developing new biodegradable materials, the miscibility and the crystallinity of blends of poly(3-hydroxybutyrate), P(3HB), and poly(3-hydroxybutyrate-co-3-hydroxyvalerate), P(3HB-co-3HV), have been studied. P(3HB) (300 kg mol−1)/P(3HB-co-3HV)–10% 3HV (340 kg mol−1) blends were prepared by casting in a wide range of ...
D.S. Conti +3 more
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European Polymer Journal, 2002
Nonisothermal crystallization and melting behavior of poly(3-hydroxybutyrate) (PHB) and maleated PHB were investigated by differential scanning calorimetry using various cooling rates. The results show that the crystallization behavior of maleated PHB from the melt greatly depends on cooling rates and its degree of grafting.
Cheng Chen +5 more
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Nonisothermal crystallization and melting behavior of poly(3-hydroxybutyrate) (PHB) and maleated PHB were investigated by differential scanning calorimetry using various cooling rates. The results show that the crystallization behavior of maleated PHB from the melt greatly depends on cooling rates and its degree of grafting.
Cheng Chen +5 more
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A chemical degradation of 3-hydroxybutyric acid
Analytical Biochemistry, 1978Abstract A method is described for degrading 3-hydroxybutyric acid to obtain specifically and in good yield each of its carbons as CO 2 . The hydroxybutyrate is dehydrated to crotonic acid which is reduced to butyric acid. The butyric acid is then degraded stepwise utilizing the Schmidt reaction.
W C, Schumann, K, Kumaran, B R, Landau
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Journal of Applied Polymer Science, 2001
AbstractThermal analyses of poly(3‐hydroxybutyrate) (PHB), poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) [P(HB–HV)], and poly(3‐hydroxybutyrate‐co‐3‐hydroxyhexanoate) [P(HB–HHx)] were made with thermogravimetry and differential scanning calorimetry (DSC).
Ji‐Dong He +3 more
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AbstractThermal analyses of poly(3‐hydroxybutyrate) (PHB), poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) [P(HB–HV)], and poly(3‐hydroxybutyrate‐co‐3‐hydroxyhexanoate) [P(HB–HHx)] were made with thermogravimetry and differential scanning calorimetry (DSC).
Ji‐Dong He +3 more
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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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Polymer Degradation and Stability, 1992
Abstract The compatibility and biodegradability of a blend of poly(3-hydroxybutyrate) (PHB) and poly(ethylene oxide) (PEO) were studied by analysis of differential scanning calorimetry and enzymatic degradation. The PHB/PEO blend exhibited a single glass-transition temperature (Tg) and the Tg values depended upon the blend composition, which ...
Y.Kumagai, Y.Doi
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Abstract The compatibility and biodegradability of a blend of poly(3-hydroxybutyrate) (PHB) and poly(ethylene oxide) (PEO) were studied by analysis of differential scanning calorimetry and enzymatic degradation. The PHB/PEO blend exhibited a single glass-transition temperature (Tg) and the Tg values depended upon the blend composition, which ...
Y.Kumagai, Y.Doi
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Journal of Applied Polymer Science, 2002
AbstractThe thermal decomposition mechanism of maleated poly(3‐hydroxybutyrate) (PHB) was investigated by FTIR and 1H NMR. The results of experiments showed that the random chain scission of maleated PHB obeyed the six‐membered ring ester decomposition process.
Cheng Chen +5 more
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AbstractThe thermal decomposition mechanism of maleated poly(3‐hydroxybutyrate) (PHB) was investigated by FTIR and 1H NMR. The results of experiments showed that the random chain scission of maleated PHB obeyed the six‐membered ring ester decomposition process.
Cheng Chen +5 more
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Journal of Environmental Polymer Degradation, 1994
The microbial degradation of tensile test pieces made of poly(3-hydroxybutyrate) [P(3HB)] or copolymers with 10% [P(3HB-co-10%3HV)] and 20% [P(3HB-co-20%3HV)] 3-hydroxyvaleric acid was studied in small household compost heaps. Degradation was measured through loss of weight (surface erosion) and changes in molecular weight and mechanical strength.
Joris Mergaert +3 more
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The microbial degradation of tensile test pieces made of poly(3-hydroxybutyrate) [P(3HB)] or copolymers with 10% [P(3HB-co-10%3HV)] and 20% [P(3HB-co-20%3HV)] 3-hydroxyvaleric acid was studied in small household compost heaps. Degradation was measured through loss of weight (surface erosion) and changes in molecular weight and mechanical strength.
Joris Mergaert +3 more
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Polymer, 1994
Abstract The hydrolytic degradation behaviour and some other properties were analysed for blends of microbial poly(3-hydroxybutyrate) [P(3HB)] with microbial poly(3-hydroxybutyrate- co -3-hydroxyvalerate) [P(3HB- co -3HV); 3HV content, 22.3 mol%].
Hidenori Satoh +2 more
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Abstract The hydrolytic degradation behaviour and some other properties were analysed for blends of microbial poly(3-hydroxybutyrate) [P(3HB)] with microbial poly(3-hydroxybutyrate- co -3-hydroxyvalerate) [P(3HB- co -3HV); 3HV content, 22.3 mol%].
Hidenori Satoh +2 more
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