Investigation of the chain length dependence of self-diffusion of poly(dimethylsiloxane) and poly(ethylene oxide) in the melt with pulsed field gradient NMR
Investigation of the chain length dependence of self-diffusion of poly(dimethylsiloxane) and poly(ethylene oxide) in the melt with pulsed field gradient NMR
复制标题
用脉冲场梯度核磁共振研究熔体中聚二甲基硅氧烷和聚环氧乙烷自扩散的链长依赖性
DOI：
10.1021/ma00072a033
复制
发表时间：
1993
期刊：
影响因子：
5.5
通讯作者：
G. Fleischer
中科院分区：
文献类型：
--
作者：
M. Appel;G. Fleischer
用聚二甲基硅氧烷（PDMS）可以研究脉冲场梯度（PFG）NMR可达到的最大摩尔质量区域。当摩尔质量大于10 M e时，根据严格的蠕动图，观察到比例D = M-2;当摩尔质量小于10 M e时，观察到与蠕动部分分离的类Rouse扩散，其特征在于自扩散系数的强烈减慢
With poly(dimethylsiloxane) (PDMS) the maximum molar mass region attainable with pulsed field gradient (PFG) NMR could be investigated. For molar masses larger than about 10M e the proportionality D∼M -2 according to the strict reptation picture was observed; at small M Rouse-like diffusion is observed separated from the reptation part by a D(M) dependence characterized by a strong slowing down of the self-diffusion coefficient