摘要
用1H NMR谱,13C NMR谱,DEPT谱,gHMQC,gHMBC二维谱和质子弛豫时间等方法研究了在紫外光辐照条件下丙烯酰胺(AM)-甲基丙烯酸(MAA)共聚合反应,讨论了AM-MAA共聚合反应时间与转化率的关系、共聚单体的连接方式、共聚物序列结构以及不同辐照时间下形成的共聚物链运动.结果表明在紫外光辐照条件下,AM-MAA共聚物链节中同时存在多种连接方式,当反应时间为45 min时,共聚合转化率可达100%.从自旋-晶格弛豫时间(T1)和自旋-自旋弛豫时间(T2)测定中得出,在辐照1小时范围内,时间越长聚合物长链分子运动速度越快,但主链的链段运动变化不明显.
AM-MAA copolymer was prepared by treating the aqueous solution of monomers with UV irradiation. The percent conversion was up to 100% with a 45-min irradiation. ^1H NMR, ^13C NMR, DEPT, gHMQC, gHMBC and proton relaxation measurements were used to analyze segmental motion, sequence structure and the linking mode of the monomers in the copolymer. The results of relaxation time measurements revealed that the longer the reaction time was, the quicker the movement of the molecules in the main chain. However, the motion of the polymer segments was not influenced significantly by the increase of irradiation time.
出处
《波谱学杂志》
CAS
CSCD
北大核心
2008年第3期363-370,共8页
Chinese Journal of Magnetic Resonance
基金
波谱与原子分子物理国家重点实验室资助课题(T152703)
关键词
NMR
序列结构
分子运动
弛豫时间
NMR
sequence structure
segmental motion
relaxation time
