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Synchronous Thermogravimetry and Differential Scanning Calorimetry Estimates of Urea Inclusion Complexes Using TGA/DSC

[ Vol. 8 , Issue. 3 ]


Gaurav Gupta, Vasim Shaikh and Kesharsingh Patil*   Pages 175 - 185 ( 11 )


Background: Urea forms channel inclusion complexes with straight chain hydrocarbon, fatty acids, etc. The decomposition of urea is an interesting thermal induced solid state reaction yielding important by-products. Urea complexation with fatty acids has been successively used in the purification and separation of fatty acids, esters and alcohols.

Objective: To study the thermal gravimetry analysis behaviour for inclusion complexes of urea with stearic acid, palmitic acid and neem oil.

To compute specific heat capacity at constant pressure, as a function of temperature for the studied systems.

Method: The thermal gravimetry analysis and differential scanning calorimetry techniques are used.

Results: Thermal profiles of adduct of fatty acid with urea indicate shift in melting temperature of urea from 408 to 413 K. Thermal profiles of urea-neem oil adduct indicating that there is some incorporation of neem oil (inclusion compound formation) by lowering the melting temperature of urea.

Conclusion: The data of the corresponding weight loss and enthalpy changes for urea, fatty acids, neem oil, urea-fatty acids adduct and urea-neem oil adduct as a function of temperature are reported. The urea-fatty acid inclusion complexes show congruent behavior in melting, while for urea-neem oil inclusion complex an incongruent melting behavior is observed.


Inclusion complex, specific heat capacity, thermal gravimetry analysis, urea decomposition, neem oil, fatty acids.


Institute of Chemical Technology, Nathalal Parekh Road, Matunga, Mumbai-400019, School of Chemical Sciences, North Maharashtra University, Jalgaon-425001, School of Chemical Sciences, North Maharashtra University, Jalgaon-425001

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