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ChemEngineering 2017, 1(2), 16; doi:10.3390/chemengineering1020016

Effects of Grafting Azacrown Ether on Thermal and Swelling Properties of Chitosan Films

1
Chair of Forest Biomaterials, University of Freiburg, Werthmanstr. 6, 79085 Freiburg, Germany
2
Freiburg Materials Research Center, University of Freiburg, Stefan-Meier-Straße 21, 79104 Freiburg, Germany
*
Author to whom correspondence should be addressed.
Received: 20 September 2017 / Revised: 7 November 2017 / Accepted: 15 November 2017 / Published: 17 November 2017
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Abstract

The thermal and swelling properties of a series of azacrown ether-crosslinked chitosans prepared with varying molar amounts of N,N-diallyl-7,13-diaza-1,7,10,16-tetraoxa-dibenzo-18-crown-6 (molar equivalents ranging from 0, 0.125, 0.167, 0.25 and 0.5) films were studied with Thermographimetric analysis (TGA), Differential Scanning Calorimetry (DSC), Dynamic Mechanical analysis (DMA) techniques and swelling kinetics. Introducing the azacrown (DAC) as crosslinker into the chitosan matrices (Ch) altered the thermal and swelling properties of the chitosan/crown ether films (Ch-DAC) systematically with respect to molar ratios. At lower DAC content, a depression of Tg revealed a dominating internal plasticization effect of DAC on chitosan, while higher DAC molar ratios systematically increased the Tg of the network. The films high swelling capacity (as high as 1200%) was reached within three hours in aqueous acidic media and decreased systematically with increasing DAC content. The swelling behavior was highly dependent on pH and followed second order kinetics. Understanding the thermal and swelling properties of this series of azacrown ether-crosslinked chitosans sets the stage to further shed light on their impact for heavy metal adsorption in water remediation applications. View Full-Text
Keywords: azacrown ether; chitosan crosslinking; glass transition temperature; swelling behavior; chitosan films azacrown ether; chitosan crosslinking; glass transition temperature; swelling behavior; chitosan films
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Toeri, J.; Laborie, M.-P. Effects of Grafting Azacrown Ether on Thermal and Swelling Properties of Chitosan Films. ChemEngineering 2017, 1, 16.

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