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Polymers 2012, 4(2), 1012-1024; doi:10.3390/polym4021012

Thermal Properties and Thermal Degradation of Cellulose Tri-Stearate (CTs)

School of Chemical Engineering and Materials, Eastern Liaoning University, Dandong, Liaoning 118003, China
Received: 13 February 2012 / Revised: 2 April 2012 / Accepted: 5 April 2012 / Published: 16 April 2012
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Cellulose tri-stearate (CTs) was synthesized employing trifluoroacetic anhydride (TFAA), stearic acid (SA), with microcrystal cellulose (MCC) and characterized with FT-IR and 1H-NMR. The degree of substitution of CTs was determined by the traditional saponification method and 1H-NMR. The thermal properties of CTs were investigated by the thermogravimetric analysis (TGA) under Ar flow in dynamic heating conditions. Thermal stability, activation energy, as well as the degradation mechanism of the decomposition process were revealed. The results showed that the thermal stability of CTs is superior to that of raw materials-MCC, and that the degradation of CTs in argon is a first-order weight loss; the initial decomposition temperature and the temperature corresponding to maximum degradation rate (Tp) increase with an increase in heating rate. The activation energy values were calculated with the Ozawa method, Coats-Redfern method and Kinssinger method, respectively. Analyses of experimental results suggest that the degradation mechanism 0.10 < α < 0.80 is F2 type, A3 for α < 0.1, and R3 for α > 0.80. The degradation mechanism of CTs in the whole conversion range is a complex mechanism, and is the combination of A3, F2 and R3.
Keywords: cellulose tri-stearate (CTs); thermal properties; thermal degradation mechanism; TGA cellulose tri-stearate (CTs); thermal properties; thermal degradation mechanism; TGA
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Huang, F.-Y. Thermal Properties and Thermal Degradation of Cellulose Tri-Stearate (CTs). Polymers 2012, 4, 1012-1024.

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