Results 311 to 320 of about 579,743 (356)
Some of the next articles are maybe not open access.
International Journal of Biological Macromolecules, 2021
To study dextran degradation by sonoenzymolysis, the degradation rate, the change of molecular weight, the mass fractions of fragments of certain molecular weight, and the degradation kinetics were analyzed and compared with the corresponding parameters under ultrasonic and enzymolysis treatments.
Qing, Wang +4 more
openaire +2 more sources
To study dextran degradation by sonoenzymolysis, the degradation rate, the change of molecular weight, the mass fractions of fragments of certain molecular weight, and the degradation kinetics were analyzed and compared with the corresponding parameters under ultrasonic and enzymolysis treatments.
Qing, Wang +4 more
openaire +2 more sources
Degradation methods and degradation kinetics of polymer films
Polymer Degradation and Stability, 1994Abstract Two accelerated degradation systems are described for the marine and soil exposures of polymer films. The systems were designed to provide controlled environments in which rates of degradation could be accelerated. The goal in developing these systems was to provide a standardized basis for comparing degradation kinetics of the films ...
D.L. Kaplan +4 more
openaire +1 more source
Polydimethylsiloxane thermal degradation Part 1. Kinetic aspects
Polymer, 2001Abstract A combination of traditional kinetic formal treatments and computer simulation has been made to analyze polydimethylsiloxane (PDMS) thermal degradation. It was shown that PDMS thermally decomposes to cyclic oligomers through Si – O bond scission in a chain-folded cyclic conformation energetically favored by overlapping of empty silicon d ...
CAMINO, Giovanni +2 more
openaire +3 more sources
Azo compound degradation kinetics and halonitromethane formation kinetics during chlorination
Chemosphere, 2017The chlorination of azo compounds can produce halonitromethanes (HNMs), which have attracted increasing concern due to their high genotoxicity. By impacting the speciation of chlorine and azo compounds, pH impacts apparent second-order rate constants of Methyl Orange (MO, 27.5-1.4 × 103 M-1 s-1), Acid Orange II (AO, 16.7-99.3 M-1 s-1), and Acid Red 1 ...
Jing Fu +4 more
openaire +2 more sources
Degradation kinetics of polyimide film
High Performance Polymers, 2011Through 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 +4 more
openaire +1 more source
Degradation kinetics of 6-aminopenicillanic acid
Journal of Pharmaceutical Sciences, 1967The 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 ...
openaire +2 more sources
Thermal degradation kinetics of sepiolite
Clay Minerals, 2020AbstractThe 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 +2 more
openaire +1 more source
Degradation Kinetics of Neostigmine in Solution
Drug Development and Industrial Pharmacy, 2000The 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.
openaire +2 more sources
Kinetics of Degradation of Biapenem
International Journal of Chemical Kinetics, 2014ABSTRACTThe 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 +4 more
openaire +1 more source
Olanzapine degradation kinetics in aqueous solution.
Die Pharmazie, 2011The 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 ...
openaire +2 more sources