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来源：百度知道 编辑：UC知道 时间：2024/06/06 05:09:53
Dynamic light-scattering characterization of the molecular weight distribution of unfractionated polyimide
Mohammad Siddiq 1 *, Chi Wu 2
Keywords
dynamic laser light scattering; unfractionated polyimide; poly(BCPOBDA/DMMDA); Rayleigh ratio; intensity-intensity time correlation
Abstract
Using a developed laser light-scattering (LLS) procedure, we accomplished the characterization of an unfractionated polyimide (UPI) in CHCl3 at 25°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( ), and then to the translational diffusion coefficient distribution G(D). By using a previously established calibration of D (cm2/s) = 3.53 × 10-4 M-0.579, we were able to convert G(D) into a molecular weight distribution. The weight-average molecular weight Mw, calculated from the molecular weight distribution, agrees well with that directly measure
Mohammad Siddiq 1 *, Chi Wu 2
Keywords
dynamic laser light scattering; unfractionated polyimide; poly(BCPOBDA/DMMDA); Rayleigh ratio; intensity-intensity time correlation
Abstract
Using a developed laser light-scattering (LLS) procedure, we accomplished the characterization of an unfractionated polyimide (UPI) in CHCl3 at 25°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( ), and then to the translational diffusion coefficient distribution G(D). By using a previously established calibration of D (cm2/s) = 3.53 × 10-4 M-0.579, we were able to convert G(D) into a molecular weight distribution. The weight-average molecular weight Mw, calculated from the molecular weight distribution, agrees well with that directly measure
动态光散射表征分子量分布普通聚酰亚胺
穆罕默德siddiq 1 * ，
关键词
动态激光光散射;普通聚酰亚胺;聚（ bcpobda / dmmda ） ;瑞利比例;强度强度时间的相关性
摘要
利用发达的激光光散射（雷电定位系统）的程序，我们完成了表征一个普通的聚酰亚胺（合众国际社）在氯仿在25 ℃拉普拉斯反演精确测量强度强度时间相关函数从动态的LLS导致我们首先要估计的特征线宽分布G （上） ，然后向平移扩散系数分配克（四） 。用以前建立的校准对D （平方厘米/秒） = 3.53 × 10-4米- 0.579 ，我们能够转换为克（四）成为一个分子量分布。体重平均分子量兆瓦，计算出分子量分布，以及同意与直接测量在静态的LLS 。我们的结果表明，双方的校准和雷电定位系统所用的程序在这方面的研究已准备就绪，以适用于作为一个常规方法为表征分子量分布的聚酰亚胺。 © 2001 John Wiley ＆ Sons出版公司j应用polym工商局局长81 ： 1670年至1674年， 2001年