Thermal degradation of poly(ethylene oxide) and polyacrylamide with ascorbic acid

2006 ◽  
Vol 101 (5) ◽  
pp. 3067-3072 ◽  
Author(s):  
S. P. Vijayalakshmi ◽  
Ashok Raichur ◽  
Giridhar Madras
Keyword(s):  
Ascorbic Acid ◽  
Thermal Degradation ◽  
Ethylene Oxide ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Different approaches to the kinetic analysis of thermal degradation of poly(ethylene oxide)

2017 ◽  
Vol 131 (1) ◽  
pp. 325-334 ◽  
Author(s):  
Matko Erceg ◽  
Irena Krešić ◽  
Nataša Stipanelov Vrandečić ◽  
Miće Jakić
Keyword(s):  
Thermal Degradation ◽  
Ethylene Oxide ◽  
Kinetic Analysis ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Vacuum Thermal Degradation of Poly(ethylene oxide)

2009 ◽  
Vol 113 (10) ◽  
pp. 2984-2989 ◽  
Author(s):  
Andrei Choukourov ◽  
Andrey Grinevich ◽  
Oleksandr Polonskyi ◽  
Jan Hanus ◽  
Jaroslav Kousal ◽  
...  
Keyword(s):  
Thermal Degradation ◽  
Ethylene Oxide ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

scholarly journals Influence of poly(ethylene oxide) sample preparation on the results of thermogravimetric analysis

St open ◽  
2021 ◽  
Vol 2 ◽  
pp. 1-13
Author(s):  
Anđela Čović ◽  
Nataša Stipanelov Vrandečić
Keyword(s):  
Activation Energy ◽  
Melting Point ◽  
Thermogravimetric Analysis ◽  
Thermal Degradation ◽  
Ethylene Oxide ◽  
Spectroscopic Analysis ◽  
Infrared Spectroscopic Analysis ◽  
Solution Cast ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Aim: To investigate whether the sample preparation process of poly(ethylene oxide) (PEO) affects kinetic analysis of the thermal degradation process. Kinetic analysis was performed to describe the course of a chemical reaction regardless of the reaction conditions and the reaction system complexity. One differential method, the Friedman method, and one integral Kissinger-Akahira-Sunose method (KAS), were applied in this work. Methods: The PEO sample was prepared in 4 different ways. Thermogravimetric analysis was performed to determine the thermal degradation of prepared samples. Infrared spectroscopic analysis was performed during the preparation of the PEO film obtained by casting from the solution. Results: Dynamic thermal decomposition of PEO, regardless of the method of preparation, takes place through a single decomposition stage, which is manifested by the appearance of one peak on derivative thermogravimetric (DTG) curve. During the preparation of the PEO film, the procedure was carried out at a temperature higher than its melting temperature (Tm=65°C). After the cooling, the obtained sample didn’t solidify and it had an intense odor of acetic acid, which was confirmed by infrared spectroscopic analysis. Samples III and IV were re-prepared at a temperature lower than the melting point of PEO, obtaining samples of satisfactory quality. Conclusion: In order to prepare poly(ethylene oxide) films by solution casting technique, drying should be carried out at temperatures below the melting point of PEO. If TG analysis of pure PEO powder is compared with the results of hot pressed samples and solution cast samples, it can be concluded that the preparation of the sample doesn’t affect the thermal stability of the PEO. The dependence of activation energy calculated by the differential Friedman and integral KAS method on conversion is constant for all samples in a broad conversion range, regardless of how the samples were prepared. The hot pressed samples and solution cast samples have lower activation energy than the commercial PEO powder.

The thermal degradation of poly(ethylene oxide) and its complex with NaCNS

1989 ◽  
Vol 25 (7-8) ◽  
pp. 779-784 ◽  
Author(s):  
G. Gordon Cameron ◽  
Malcolm D. Ingram ◽  
M. Younus Qureshi ◽  
Helen M. Gearing ◽  
Luigi Costa ◽  
...  
Keyword(s):  
Thermal Degradation ◽  
Ethylene Oxide ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene
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