Journal
CARBOHYDRATE POLYMERS
Volume 116, Issue -, Pages 26-33Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2014.04.083
Keywords
Chitosan; Reductive aminat ion; Microwave irradiation; Physico-chemical properties
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Conventional heating and microwave irradiation have been compared for the synthesis of chitosans grafted with alkyl chains. Reaction time (1-60 min), temperature (25 and 40 degrees C) and chitosan molar mass have been studied onto the yield of alkylation. The irradiation mode has been scrupulously controlled to highlight the effect of the use of microwaves. The chemical structure of modified polymers (degree of alkylation) is determined from NMR. In relation to the rheological behavior and surface tension measurements, the evolution of hydrophobic interactions is studied as a function of the yield of alkylation. A maximum of intrinsic viscosity and hydrodynamic diameter was observed for a degree of alkylation of around 10%. All the results tend to prove that microwave assisted synthesis is a powerful method to obtain modified chitosan under extremely low reaction time without any degradation and/or property modifications. (C) 2014 Elsevier Ltd. All rights reserved.
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