Structure and properties of polyurethane prepolymer modified water-soluble chitosan by mechanical kneading
ZHANG Yu1， WENG Fangqing2， DENG Yinghua1， WU Qiangxian2， ZENG Guoping1
1.College of Chemistry and Life Science，Hubei University of Education，Hubei Key Laboratory of Purification and Application of Plant Anti-Cancer Active Ingredients，Wuhan 430205，China； 2.Green Polymer Laboratory and Key Laboratory of Pesticide & Chemical Biology of the Ministry of Education， College of Chemistry， Central China Normal University， Wuhan 430079， China
Abstract：In this work， water soluble chitosan was successfully modified with water as the plasticizer and polyurethane prepolymer (PUP) as the modifier by solid state reaction in an intensive mixer. The effects of PUP content on the structure/properties of the modified chitosan was investigated. The results showed that there was a strong interaction between PUP and chitosan. With the increasing PUP contents， the flexibility of modified chitosan increased while the adsorption property of modified chitosan decreased， suggesting that partial-NH2 groups of chitosan participated in the reaction. The obtained material is thermoplastic， thus can be directly used for film pressure or foaming， which highly expands the application of chitosan. This work provided a new method to prepare modified thermoplastic chitosan.
2018, Vol. 52 
