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Swelling Behavior of Chitosan Hydrogel in Ionic Liquid-Water Binary System

Published online by Cambridge University Press:  01 February 2011

Chang Kee Lee,
Sang Jun Park,
Seong Gil Yoon,
Kwang Min Shin,
Su Ryon Shin,
Bon Kang Gu,
Min Sup Kim,
Min Kyoon Shin,
Yu Jin Kim and
Seon Jeong Kim
Chang Kee Lee
Affiliation:
withs@ihanyang.ac.kr Hanyang University Seoul N/A N/A Korea, Republic of
Sang Jun Park
Affiliation:
sjpark92@ihanyang.ac.kr, Hanyang University, Seoul, N/A, N/A, Korea, Republic of
Seong Gil Yoon
Affiliation:
pandasky@ihanyang.ac.kr, Hanyang University, Seoul, N/A, N/A, Korea, Republic of
Kwang Min Shin
Affiliation:
coolskm@ihanyang.ac.kr, Hanyang University, Seoul, N/A, N/A, Korea, Republic of
Su Ryon Shin
Affiliation:
srshin@ihanyang.ac.kr, Hanyang University, Seoul, N/A, N/A, Korea, Republic of
Bon Kang Gu
Affiliation:
bons1020@ihanyang.ac.kr, Hanyang University, Seoul, N/A, N/A, Korea, Republic of
Min Sup Kim
Affiliation:
kimins21@ihanyang.ac.kr, Hanyang University, Seoul, N/A, N/A, Korea, Republic of
Min Kyoon Shin
Affiliation:
masscsq@ihanyang.ac.kr, Hanyang University, Seoul, N/A, N/A, Korea, Republic of
Yu Jin Kim
Affiliation:
snow82@ihanyang.ac.kr, Hanyang University, Seoul, N/A, N/A, Korea, Republic of
Seon Jeong Kim
Affiliation:
sjk@hanyang.ac.kr, Hanyang University, Seoul, N/A, N/A, Korea, Republic of
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Abstract

The swelling behavior of chitosan hydrogels in ionic liquid–water binary systems was studied using hydrophilic room-temperature ionic liquids (RTILs) to elucidate the swelling properties of chitosan hydrogels. It was confirmed that chitosan hydrogels are much stiffer after immersing in a pure RTIL because the water existing inside the chitosan polymer network is extracted into the RTIL. The pH of the binary system changes when the RTIL is in contact with water. The chitosan hydrogels were fully dissociated at a 90% water content in the BMI-BF4-water binary system. The equilibrium binary system content behavior of the chitosan hydrogels depended upon the amount of free water present. The water behavior in a pure RTIL was examined using differential scanning calorimetry.

Keywords

blendpolymerfilm

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