用CP/MAS^(13)C NMR研究壳聚糖的分子运动  

STUDY ON MOLECULAR MOTION OF CHITOSAN USING A CP/MAS SOLID ^(13)C NMR

作　　者：赵晓东[1] 刘文广[1] 姚康德[1] 

机构地区：[1]天津大学高分子材料研究所,天津300072

出　　处：《热固性树脂》2003年第4期7-9,共3页Thermosetting Resin

摘　　要：用固体交叉极化/魔角旋转(CP/MAS)13CNMR测定了壳聚糖、热失水壳聚糖和戊二醛交联壳聚糖在固态下不同峰位13C的弛豫时间,对不同样品的不同峰位碳弛豫时间的大小进行了解释,并根据弛豫时间的测定值对这3种不同壳聚糖样品的分子运动状态进行了描述。结果表明,壳聚糖受热失去吸附水以后,所有位置碳的弛豫时间均有所延长,以C2,6的弛豫时间延长幅度最大,分子运动受阻;壳聚糖用戊二醛交联以后,所有13C信号的线宽均大幅度增加,而弛豫时间显著降低,分子运动加剧。The molecular motion of untreated chitosan,thermally dehydrated chitosan and glutaraldehydecrosslinked chitosan was studied using crosspolarization/magicangle spinning (CP/MAS) solid state 13C NMR technology.The relaxation times(T1) of every carbon in three chitosan samples were detected respectively.The results showed that every carbons,especially C2 and C6,in thermally dehydrated chitosan displayed longer relaxation times(T1)than those in the untreated chitosan sample.After chitosan was crosslinked by glutaraldehyde,the resonance signals of all carbons became broad obviously and their relaxation times(T1) were decreased to less than half of those in the untreated chitosan sample without any crosslinkage.The T1 changes caused by thermal dehydration or glutaraldehyde crosslinking were explained on basis of relaxation mechanisms.

关 键 词：^13C CP/MAS NMR 壳聚糖 分子运动 

分 类 号：O636.1[理学—高分子化学]