文献类型：期刊文献

英文题名：Effect of cupric ion on thermal degradation of chitosan

作者：Ou, Chun-Yan[1];Li, Si-Dong[1];Li, Cheng-Peng[1];Zhang, Chao-Hua[2];Yang, Lei[1];Chen, Chong-Peng[1]

机构：[1]Guangdong Ocean Univ, Coll Sci, Zhanjiang 524088, Peoples R China;[2]Guangdong Ocean Univ, Coll Food Sci & Technol, Zhanjiang 524088, Peoples R China

年份：2008

卷号：109

期号：2

起止页码：957

外文期刊名：JOURNAL OF APPLIED POLYMER SCIENCE

收录：SCI-EXPANDED(收录号：WOS:000256267200035)、、EI(收录号：20083111418876)、Scopus(收录号：2-s2.0-47949094669)、WOS

语种：英文

外文关键词：chitosan; cupric ion; thermal degradation; thermogravimetry analysis; differential thermal analysis

外文摘要：The thermal degradation of chitosan and chitosan-cupric ion compounds in nitrogen was studied by thermogravimetry analysis and differential thermal analysis (DTA) in the temperature range 30-600 degrees C. The effect of cupric ion on the thermal degradation behaviors of chitosan was discussed. Fourier transform-infrared (FTIR) and X-ray diffractogram (XRD) analysis were utilized to determine the micro-structure of chitosan-cupric ion compounds. The results show that FTIR absorbance bands of -N-H, -C-N-, -C-O-C- etc. groups of chitosan are shifted, and XRD peaks of chitosan located at 11.3, 17.8, and 22.8 degrees are gradually absent with increasing weight fraction of cupric ion mixed in chitosan, which show that there are coordinating bonds between chitosan and cupric ion. The results of thermal analysis indicate that the thermal degradation of chitosan and chitosan-cupric ion compounds in nitrogen is a two-stage reaction. The first stage is the deacetylation of the main chain and the cleavage of glycosidic linkages of chitosan, and the second stage is the thermal destruction of pyranose ring of chitosan and the decomposition of residual carbon, in which both are exothermic. The effect of cupric ion on the thermal degradation of chitosan is significant. In the thermal degradation of chitosan-cupric ion compounds, the temperature of initial weight loss (T-st), the temperature of maximal weight loss rate (T-max), that is, the peak temperature on the DTG curve, and the peak temperature (T-p) on the DTA curve decrease, and the reaction activation energy (E-a) varies with increasing weight fraction of cupric ion. (C) 2008 Wiley Periodicals, Inc.