High-Resolution Latex State 13C-NMR Spectroscopy: Part II. Effect of Particle Size and Temperature
High-Resolution Latex State 13C-NMR Spectroscopy: Part II. Effect of Particle Size and Temperature
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高分辨率乳胶态 13C-NMR 光谱：第二部分。
DOI：
10.5254/1.3544951
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发表时间：
2001
影响因子：
1.5
通讯作者：
Yasuyuki Tanaka
中科院分区：
文献类型：
--
作者：
S. Kawahara;Yoshinobu Isono;K. Washino;Toshiko Morita;Yasuyuki Tanaka
本文采用与溶液相类似的观测条件，对聚合物胶态分散体进行了乳胶态~（13）C-NMR测量。通过离心将显示宽和双峰粒度分布的胶体分散体分级成具有不同体积平均粒径的四个级分，其范围为0.121至1.31 μm，具有窄和单峰分布。分级分散体的每个分辨碳共振的信噪比、半宽和强度取决于颗粒直径。碳共振的强度随着粒径的减小和温度的升高而增加到100%。这是解释相对于颗粒的布朗运动的扩散系数的增加。信号的强度和半宽度与布朗运动的扩散系数叠加。
Abstract Latex state C-NMR measurements were made for colloidal dispersions of polymer, using the observation conditions similar to those used in solution state measurement. The colloidal dispersion which showed broad and bimodal distributions in particle size was fractionated by centrifugation into four fractions with different volume mean particle diameter ranging from 0.121 to 1.31 µm with narrow and unimodal distributions. The signal to noise ratio, half width and intensity of each resolved carbon resonance for the fractionated dispersions were dependent upon the particle diameter. The intensity of the carbon resonances increased to 100% as the particle diameter decreased and temperature was raised. This is explained with respect to the increase in diffusion coefficient of Brownian motion of the particle. The intensity and the half width of the signals were superimposed against the diffusion coefficient of Brownian motion.