Segmental motion of entangled random coil polymers studied by pulsed gradient spin echo nuclear magnetic resonance
Segmental motion of entangled random coil polymers studied by pulsed gradient spin echo nuclear magnetic resonance
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DOI：
10.1063/1.477674
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发表时间：
1998-12-08
影响因子：
4.4
通讯作者：
Callaghan, PT
中科院分区：
文献类型：
--
作者：
Komlosh, ME;Callaghan, PT
用脉冲梯度自旋回波核磁共振（NMR）研究了高摩尔质量聚苯乙烯在氘代甲苯中的半稀溶液中聚合物均方链段位移。在5%w/v的固定浓度下研究了1至20百万道尔顿的9种摩尔质量，在3百万道尔顿的固定摩尔质量下研究了5%至20%的浓度范围。访问的距离和时间尺度分别为20至1000 nm和10至3000 ms。发现了链内自旋扩散的证据，并纠正了其影响。均方节段位移的时间依赖性拟合到Doi-Edwards模型的预测和得到的管脱离时间和管直径。(C)1998年美国物理学会。[S0021-9606（98）50646-0]。
Pulsed gradient spin echo nuclear magnetic resonance (NMR) is used to investigate polymer mean-squared segmental displacements in semidilute solutions of high molar mass polystyrene in deuterio-toluene. Nine molar masses from 1 to 20 million daltons are studied at a fixed concentration of 5% w/v, and a range of concentrations from 5% to 20% at fixed molar mass of 3 million daltons. The distance and time scales accessed are 20 to 1000 nm and 10 to 3000 ms, respectively. Evidence for intrachain spin diffusion is found and its effect corrected for. The time dependence of mean-squared segmental displacements is fitted to the predictions of the Doi-Edwards model and tube disengagement times and tube diameters obtained. (C) 1998 American Institute of Physics. [S0021-9606(98)50646-0].