Nuclear magnetic resonance relaxation study of the organization of layers of poly(ethylene oxide) chains grafted on silica
Nuclear magnetic resonance relaxation study of the organization of layers of poly(ethylene oxide) chains grafted on silica
复制标题
二氧化硅接枝聚环氧乙烷链层组织的核磁共振弛豫研究
DOI：
10.1016/0032-3861(96)88460-6
复制
发表时间：
1996
期刊：
影响因子：
--
通讯作者：
H. Bouchriha
中科院分区：
文献类型：
--
作者：
T. Tajouri;H. Bouchriha
质子核磁共振（n.m.r.）在300 MHz下测定接枝在二氧化硅上的聚（环氧乙烷）的弛豫时间。从唯象的角度定性地讨论了温度和接枝率对弛豫时间的依赖关系。提出了两种模型的表面层的两个极端的接枝率水平。在低接枝率下，链非常平坦，而在高接枝率下，层更有组织。作为温度的函数的质子弛豫时间获得的数据显示，每个接枝率使用的过渡的存在。
The proton nuclear magnetic resonance (n.m.r.) relaxation times of poly(ethylene oxide) grafted on silica were determined at 300 MHz. The dependence of the temperature and grafting ratio on the relaxation times is discussed qualitatively from a phenomenological point of view. Two models are proposed for the surface layer for the two extreme grafting ratio levels. At a low grafting ratio the chains lie very flat, whereas at a high grafting ratio, the layer is more organized. Data obtained for the proton relaxation time as a function of temperature show the existence of a transition for each grafting ratio used.