Results 211 to 220 of about 574,787 (253)

Degradation kinetics of polyimide film

High Performance Polymers, 2011
Through the use of thermogravimetry (TG), this work explores the thermal degradation mechanism and kinetics of Kapton (polyimide) film. Isoconversional kinetic methods, which provide activation energy as a function of degradation, present insight into the development of a five-step competitive and consecutive kinetic model.
Peter R. Hondred, Sungho Yoon, Nicola Bowler, Elena Moukhina, Michael R. Kessler   +4 more
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Degradation kinetics of 6-aminopenicillanic acid

Journal of Pharmaceutical Sciences, 1967
The degradation of 6-aminopenicillanic acid (6APA), as measured by the loss of the β-lactam ring, followed pseudo first-order kinetics with initial concentrations of 0.05–0.92 M and in the pH and temperature range of 5.8–6.6 and 35–90°, respectively. Higher orders of degradation rates were approached with increasing pH while the maximum stability of ...
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Thermal degradation kinetics of sepiolite

Clay Minerals, 2020
AbstractThe kinetic parameters of the thermal degradation of sepiolite were evaluated with a new method based on thermal analysis data. Thermogravimetric/differential thermal analysis curves were recorded for the natural and preheated sepiolite samples in the temperature range 25–800°C for 4 h.
Yüksel Sarıkaya, Müşerref Önal, Abdullah Devrim Pekdemir   +2 more
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Degradation Kinetics of Neostigmine in Solution

Drug Development and Industrial Pharmacy, 2000
The degradation kinetics of neostigmine were studied in aqueous solutions with varied pH from 1.5 to 9.9 under accelerated storage conditions. The stability of neostigmine in solutions containing propylene glycol or polyethylene glycol 400 was also investigated.
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Kinetics of Degradation of Biapenem

International Journal of Chemical Kinetics, 2014
ABSTRACTThe kinetic and thermodynamic analysis of biapenem degradation was conducted during acid–base hydrolysis, under the influence of buffer components and in the solid state at increased temperature (dry air) and relative air humidity (RH > 50%).
JUDYTA CIELECKA‐PIONTEK, PRZEMYSŁAW ZALEWSKI, PIOTR GARBACKI, EWELINA JURA, ALICJA TALACZYŃSKA   +4 more
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Olanzapine degradation kinetics in aqueous solution.

Die Pharmazie, 2011
The degradation kinetics of olanzapine as a function of pH and temperature has been studied by a spectrophotometric method. The degradation reaction rates were observed to follow first-order kinetics with respect to olanzapine. The hydrolytic reaction was shown to be hydrogen and hydroxide ion-catalyzed and the Arrhenius plots showed the temperature ...
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Photo-crosslinked acrylates degradation kinetics

Journal of Thermal Analysis and Calorimetry, 2009
A series of crosslinked polyurethane acrylate solids with glass transition temperatures ranging from –49 to +65 °C was prepared by photopolymerization of specially formulated solvent-free resins. The kinetics of thermooxidative and thermal (in N2) degradation of these crosslinked acrylate networks at temperatures ranging from 100 to 400 °C was studied ...
Vadim V. Krongauz, Michael T. K. Ling
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Degradation Kinetics of Polypyrrole Films

Journal of The Electrochemical Society, 1993
Kinetic measurements have been made on the degradation reaction of electrochemically prepared polypyrrole films. The measurements were made by applyin proper potentials at polymer film covered electrodes in aqueous sulfuric acid solutions and monitoring the absorbance of the electrolysis product as a function of time.
Deog‐Soo Park, Yoon‐Bo Shim, Su‐Moon Park   +2 more
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Kinetic Treatments of Degradation

1996
Most photodegradation experiments are usually carried out in isothermal conditions, whereas polymers and plastics work in the environmental conditions within non-isothermal parameters. The rates of many degradation processes in polymers generally increase as the temperature rises.
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Kinetics of the photocatalytic degradation of benzene

Catalysis Today, 2007
The kinetics of photocatalytic degradation of benzene in air has been studied on a standardized micro-pilot scale continuous flow apparatus. Both the yield of conversion of the reactant and the apparition of CO and CO2 have been monitored. The influences of concentration, light flux and temperature on the initial degradation rate have been studied.
Doucet, Nicolas, Zahraa, Orfan, Bouchy, Michel   +2 more
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