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Dynamic Light-Scattering Characterization of the Molecular Weight Distribution of Unfractionated Polyimide

机译:未分级聚酰亚胺分子量分布的动态光散射表征

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摘要

Using a developed laser light-scattering (LLS) procedure, we accomplished the characterization of an unfractionated polyimide (UPI) in CHCl_3 at 25°C. The Laplace inversion of precisely measured intensity-intensity time correlation function &om dynamic LLS leads us first to an estimate of the characteristic line-width distri- bution G(r), and th~n to the translational diffusion coefficient distribution G(D). By using a previously established calibration of D (cm~2/s) = 3.53 * 10~(-4) M~(-0.579), we were able to convert G(D) into a molecular weight distribution. Theweight-average molecular weight Mw, calculated from the molecular weight distribution, agrees well with that directly measured in static LLS. Our results indicate that both the calibration and LLS procedure used in this study are ready to be applied as a routine method for the characterization of the molecular weight distribution of polyimide.
机译:使用发达的激光散射(LLS)程序,我们在25°C下于CHCl_3中完成了未分级聚酰亚胺(UPI)的表征。精确测量的强度-强度时间相关函数和动态LLS的拉普拉斯反演首先使我们得出了特征线宽分布G(r)的估计,然后得出了平移扩散系数分布G(D)。通过使用先前建立的D(cm〜2 / s)= 3.53 * 10〜(-4)M〜(-0.579)的校准,我们能够将G(D)转换为分子量分布。由分子量分布计算的重均分子量Mw与在静态LLS中直接测量的重均分子量很好。我们的结果表明,本研究中使用的校准和LLS方法均已准备就绪,可作为表征聚酰亚胺分子量分布的常规方法。

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