Kinetics of the batch cationic emulsion polymerization of styrene: A comparative study with the anionic case

2006 ◽  
Vol 44 (15) ◽  
pp. 4461-4478 ◽  
Author(s):  
Jose Ramos ◽  
Álvaro Costoyas ◽  
Jacqueline Forcada
Keyword(s):  
Comparative Study ◽  
Emulsion Polymerization ◽  
Kinetics Of

scholarly journals Comparative Study of Chemical Stability of Two H1Antihistaminic Drugs, Terfenadine and ItsIn VivoMetabolite Fexofenadine, Using LC-UV Methods

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Anna Gumieniczek ◽  
Anna Berecka-Rycerz ◽  
Rafał Pietraś ◽  
Izabela Kozak ◽  
Karolina Lejwoda ◽  
...  
Keyword(s):  
Comparative Study ◽  
Chemical Stability ◽  
First Order ◽  
First Order Kinetics ◽  
Kinetics Of Degradation ◽  
Effects Of Temperature ◽  
High Doses ◽  
Antihistaminic Drugs ◽  
Kinetics Of

A comparative study of chemical stability of terfenadine (TER) and itsin vivometabolite fexofenadine (FEX) was performed. Both TER and FEX were subjected to high temperature at different pH and UV/VIS light at different pH and then quantitatively analyzed using new validated LC-UV methods. These methods were used to monitor the degradation processes and to determine the kinetics of degradation for both the compounds. As far as the effects of temperature and pH were concerned, FEX occurred more sensitive to degradation than TER. As far as the effects of UV/VIS light and pH were concerned, the both drugs were similarly sensitive to high doses of light. Using all stress conditions, the processes of degradation of TER and FEX followed the first-order kinetics. The results obtained for these two antihistaminic drugs could be helpful in developing their new derivatives with higher activity and stability at the same time.

Kinetics of Chemical Changes in Phenol Formaldehyde Based Polymeric Films Etched in N2O and O2Inductively Coupled Plasmas: A Comparative Study

2009 ◽  
Vol 48 (8) ◽  
pp. 08HA02 ◽  
Author(s):  
Kwang-Ho Kwon ◽  
Nam-Ki Min ◽  
Seung-Youl Kang ◽  
Kyu-Ha Baek ◽  
Kyung Soo Suh ◽  
...  
Keyword(s):  
Comparative Study ◽  
Phenol Formaldehyde ◽  
Polymeric Films ◽  
Chemical Changes ◽  
Coupled Plasmas ◽  
Kinetics Of
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