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首页> 外文期刊>Langmuir: The ACS Journal of Surfaces and Colloids >Relaxation studies of high molecular weight poly(dimethylsiloxane)s blended with polysilicate nanoparticles
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Relaxation studies of high molecular weight poly(dimethylsiloxane)s blended with polysilicate nanoparticles

机译:高分子量聚二甲基硅氧烷与聚硅酸盐纳米粒子共混的弛豫研究

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摘要

Nuclear magnetic resonance spin-spin relaxation (T-2) measurements have been used to investigate the segmental mobility of high molecular weight poly(dimethylsiloxane) (PDMS) polymers when blended with trimethylsilyl-treated polysilicate nanoparticles. The relaxation behavior was complex and could not be described by a single-exponential function. The results showed that a high molecular weight polysilicate caused a dramatic reduction in the overall PDMS chain mobility above a critical concentration. However, a surprising increase in mobility was observed below this critical concentration. The origin of this phenomenon was hypothesized to be a combination of free volume, polymer adsorption, and entanglement effects at low particle concentrations. The apparent increase in mobility was also manifested by a decrease in the shear viscosity and plateau modulus relative to data for the base polymer. The critical concentration was found to be dependent upon temperature and molecular weight. [References: 23]
机译:核磁共振自旋自旋弛豫(T-2)测量已用于研究高分子量聚(二甲基硅氧烷)(PDMS)聚合物与三甲基甲硅烷基处理的聚硅酸盐纳米颗粒混合时的分段迁移率。弛豫行为很复杂,无法用单指数函数描述。结果表明,高分子量聚硅酸盐会导致整个PDMS链迁移率显着降低,超过临界浓度。然而,在该临界浓度以下观察到了迁移率的惊人增加。据推测,此现象的起因是自由体积,聚合物吸附和低颗粒浓度下的纠缠效应的组合。相对于基础聚合物的数据,剪切粘度和平稳模量的降低也表明了迁移率的明显增加。发现临界浓度取决于温度和分子量。 [参考:23]

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