首页> 外文期刊>Journal of Applied Polymer Science >DYNAMIC LIGHT-SCATTERING CHARACTERIZATION OF THE MOLECULAR WEIGHT DISTRIBUTION OF A BROADLY DISTRIBUTED PHENOLPHTHALEIN POLY(ARYL ETHER KETONE)
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DYNAMIC LIGHT-SCATTERING CHARACTERIZATION OF THE MOLECULAR WEIGHT DISTRIBUTION OF A BROADLY DISTRIBUTED PHENOLPHTHALEIN POLY(ARYL ETHER KETONE)

机译:广泛分布的酚酞聚(芳醚醚酮)的分子量分布的动态光散射特征

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摘要

Using a recently developed laser light-scattering (LLS) procedure, we accomplished the characterization of a broadly distributed unfractionated phenolphthalein poly(aryl ether ketone) (PEK-C) in CHCl3 at 25 degrees C. The laplace inversion of precisely measured intensity-intensity time correlation function from dynamic LLS leads us first to an estimate of the characteristic line-width distribution G(Gamma) and then to the translational diffusion coefficient distribution G(D). By using a previously established calibration of D (cm(2)/s) = 2.37 X 10(-4)M(-0.57), were able to convert G(D) into a differential weight distribution f(w)(M). The weight-average molecular weight M(w) calculated from f(w)(M) 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 PEK-C. (C) 1996 John Wiley & Sons, Inc. [References: 20]
机译:使用最近开发的激光散射(LLS)程序,我们在25℃下于CHCl3中完成了广泛分布的未分级酚酞聚(芳基醚酮)(PEK-C)的表征。精确测量强度强度的拉普拉斯求逆来自动态LLS的时间相关函数首先导致我们估计特征线宽分布G(Gamma),然后得出平移扩散系数分布G(D)。通过使用先前建立的D(cm(2)/ s)= 2.37 X 10(-4)M(-0.57)的校准,能够将G(D)转换为差分重量分布f(w)(M) 。由f(w)(M)计算出的重均分子量M(w)与在静态LLS中直接测量的重均分子量非常吻合。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PEK-C分子量分布的常规方法。 (C)1996 John Wiley&Sons,Inc. [参考:20]

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