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Thermogravimetric analysis of 2,6-diaminopyridine substituted polymers using green conditions and conventional method

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Title Thermogravimetric analysis of 2,6-diaminopyridine substituted polymers using green conditions and conventional method
 
Creator Shanthi, W
Suja, R Nalini
Chitra, M
Sridevi, B
 
Subject 2,6-Diaminopyridine
Succinic acid
Phthalic acid
Citraconic acid
Energy of activation
Thermogravimetry
Limiting Oxygen Index (LOI)
Regression analysis
Kinetic models
 
Description 860-867
Polyamides have been synthesised by a modified phosphorylation method using 2,6-diaminopyridine with diacids such as
citraconic acid, succinic acid and phthalic acid. Reaction has been carried out with NMP/Pyridine mixture containing 4% LiCl
using the following conditions: Higashi to increase viscosity and thermal stability, reported by the authors. In the present study
we carried out the synthesis under green conditions ionic liquid and microwave combined with ionic liquid and the results have
been compared. Thermogravimetric analysis of synthesized polymers have been performed in the temperature range 30 to
900°C. Thermogravimetric data have been used to calculate activation energies and compared with other integral and
differential methods like Friedmann, Freeman-Carroll, Coats-Redfern, Chang, Sharp Wentworth. Kinetic parameters - Gibb’s
free energy, entropy and enthalpy have been determined for all polyamides synthesized using microwave assisted ionic liquid
method employing Coats-Redfern method. Regression analysis has been carried out for all the three polyamides for all the
stages of decomposition which involves seven different kinetic models. The limiting oxygen index has been calculated and the
fire-retardant properties have been noted. This result is compared with all known methods.
 
Date 2024-09-24T12:25:13Z
2024-09-24T12:25:13Z
2024-09
 
Type Article
 
Identifier 2583-1321 (Online); 0019-5103 (Print)
http://nopr.niscpr.res.in/handle/123456789/64594
https://doi.org/10.56042/ijc.v63i9.10604
 
Language en
 
Publisher NIScPR-CSIR,India
 
Source IJC Vol.63(09) [September 2024]