超高取代羧甲基纤维素热分析  

Thermal Analysis of Carboxymethyl Cellulose Ethers with Super-High Degree of Substitution

作　　者：黎秉环[1] 王恩浦[1] 刘跃平[1] 李慧琼 

机构地区：[1]中国科学院广州化学研究所纤维素化学开放研究实验室,广州510650

出　　处：《纤维素科学与技术》1999年第3期6-12,共7页Journal of Cellulose Science and Technology

摘　　要：研究了氮气氛下对取代度在0．79－2．50范围的羧甲基纤维素进行TG，DTG，DTA热分析和裂解活化能的计算。结果表明，对于取代度大于1的竣甲基纤维素，随着取代度增大，其主要裂解开始温度T；和主要裂解温度几升高，而主要裂解温度范围（T2-T1）变窄和在主要裂解温度范围内失重RT减少，因而其热稳定性有所提高。超高取代度的核甲基纤维素裂解活化能也较高。按甲基纤维素的DTG和DTA的峰高与其取代度（DS）成一线性关系。Thermal stability of CMC with super - high DS was studied by thermal analysis using TG,DTG, DTA in nitrogen and by computing the active energy. The results show that with increasing DS of CMC(DS > 1 ), the starting temperature T1 of main pyrolysis and the temperature T2 of main pyrolysis increased, while the temperature range(T2 - T1 ) of main pyrolysis narrowed, and the weight loss of CMC at the temperature range of pyrolysis from T1 to T2 decreased. The active energy of CMC with DS 2. 50 is higher than other samples. DS of CMC had a linear relation ttdth the peak height of DTG or DTA.

关 键 词：纤维素 纤维素醚 羧甲基纤维素 热分析 

分 类 号：O636.11[理学—高分子化学] TQ352.7[理学—化学]