三种糖类物质的热降解动力学研究  

Thermal degradation kinetics of three kinds of poly-saccharide

作　　者：戚桂斌[1] 刘庆阳[2] 贝逸翎[1] 刘雷[1] 

机构地区：[1]山东大学化学与化工学院,山东济南250100 [2]山东大学环境研究院,山东济南250100

出　　处：《山东大学学报（理学版）》2007年第7期19-21,共3页Journal of Shandong University(Natural Science)

摘　　要：以TGA为手段,研究了壳聚糖、β-环糊精、淀粉在氮气环境下的非等温热降解动力学,采用Owaza和Friedman方法,计算了三种物质的降解动力学活化能,并使用Coats-Redfern法计算了三种物质的反应机理函数和指前因子.结果表明:壳聚糖、β-环糊精、淀粉降解活化能分别是147.1,129.1和148.3 kJ/mol,机理函数是-ln(1-α),[-ln(1-α)]2/5和[-ln(1-α)]1/2;lnA为7.783 8,8.649 9和7.868 8 min-1.Thermal decomposition kinetics of chitosan, β-cyclodextrin and starch were studied by using thermogravimetric analysis methodology. The degradation activation energies of chitosan, β-cyclodextrin and starch were calculated by the Ozawa and Fried-man methods respectively by means of TGA in a nitrogen atmosphere. Moreover, the decomposition mechanism and pre-factor was obtained by the Coats-Redfem method. It was found that the degradation activation energies of chitosan, β-cyclodextrin and starch are 147.1,129.1 and 148.3 kJ/mol, respectively. The decomposition mechanisms and lnA are -ln（l-α）, 7.783 8 min^-1; [-ln（l-α）]^2/5, 8.6499 min^-1; [-ln（l-α）]^1/2, 7.868 8 min^-1 respectively.

关 键 词：壳聚糖 Β环糊精 淀粉 TGA降解动力学 

分 类 号：O643.3[理学—物理化学]