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 glutaraldehydecrosslinked chitosan was studied using crosspolarization/magicangle spinning (CP/MAS) solid state 13C NMR technology.The relaxation times(T1) of every carbon in three chitosan samples were detected respectively.The results showed that every carbons,especially C2 and C6,in thermally dehydrated chitosan displayed longer relaxation times(T1)than those in the untreated chitosan sample.After chitosan was crosslinked by glutaraldehyde,the resonance signals of all carbons became broad obviously and their relaxation times(T1) were decreased to less than half of those in the untreated chitosan sample without any crosslinkage.The T1 changes caused by thermal dehydration or glutaraldehyde crosslinking were explained on basis of relaxation mechanisms.
出处
《热固性树脂》
CAS
CSCD
2003年第4期7-9,共3页
Thermosetting Resin
