摘要
以从麦草中分离得到的木聚糖为原料、丙烯酰胺为醚化剂、碱为催化剂、丁醇/水为反应介质制备了带有高取代度双官能团的木聚糖衍生物.采用13C核磁共振表征了木聚糖衍生物的结构.利用平行板流变仪和同步热分析仪对木聚糖衍生物与原木聚糖的动态流变性能和热稳定性进行测试,结果表明:与原木聚糖溶液相比,木聚糖衍生物溶液呈现较低的粘度,剪切变稀的现象较明显,具有较低的储能模量、损耗模量,且其储能模量稍高于损耗模量;改性后的木聚糖的热稳定性下降.
Bifunctional xylan derivatives （XDs） with high degree of substitution were prepared from native xylan in wheat straw, with acrylamide as the etherifying agent, alkali as the catalyst, and butanol/water mixture as the reaction system. Then, the structure of the products was characterized by means of 13C NMR. Moreover, the dynamic theological behaviors and thermal stability of XDs and the native xylan were tested by using a parallel-plate rheometer and a simultaneous thermal analyzer, respectively. The results show that, as compared with the native xylan, the shear-thinning phenomenon of XDs solution is significant, with relatively lower viscosity, storage modulus and loss modulus, that the storage modulus is higher than the loss modulus, and that the thermal stability of the xylan declines after the modification.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第8期82-86,共5页
Journal of South China University of Technology(Natural Science Edition)
基金
国家"973"计划项目(2010CB732201/4)
国家自然科学基金资助项目(31070530)
广东省教育厅学科建设专项资金资助项目(N9100230)
华南理工大学基本科研业务费(2009ZM0153)
关键词
木聚糖
衍生物
双官能团
丁醇
流变性能
xylan
derivative
bifunetional groups
butanol
rheological property
