Journal
CARBOHYDRATE POLYMERS
Volume 124, Issue -, Pages 124-130Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2015.01.081
Keywords
Starch nanocrystal; Hypochlorite oxidation; Thermal degradation
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Funding
- National Natural Science Foundation of China [31230057, 31201288]
- Key Technology R&D Program for the 12th Five-Year Plan [2012BAD37B02]
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The thermal degradation behavior of hypochlorite-oxidized starch nanocrystals (OSNCs) was evaluated in this study. Carbonyl and carboxyl groups in OSNCs increased from 0.006 and 0.091 mmol/g to 0.033 and 0.129 mmol/g, respectively, as the active chlorine concentration increased from 1% to 4% (w/w). Compared with starch nanocrystals (SNCs), the initial degradation temperature of OSNCs with 4% oxidization decreased from 273 degrees C to 253 degrees C. Two degradation processes were detected using differential thermal analysis. The activation energy of the low-temperature process increased with increasing oxidization level because of removal of sulfate esters and reduction of the decomposition products of H2O during oxidation. With increasing temperature, the H2O generating from decarboxylation and decomposition of the carboxyl groups may catalyze SNCs depolymerization, leading to decrease in the activation energy of the high-temperature process. OSNCs (4% oxidized level) can be used in dry process below 253 degrees C to avoid degradation. (C) 2015 Elsevier Ltd. All rights reserved.
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