Laser light scattering of the molecular weight distribution of unfractionated phenolphthalein poly(aryl ether sulfone)

✍ Scribed by Mohammad Siddiq; Bianyao Li; Chi Wu

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 182 KB
• Volume: 35
• Category: Article
• ISSN: 0887-6266
• DOI: 10.1002/(sici)1099-0488(19970115)35:1<85::aid-polb6>3.0.co;2-u

✦ Synopsis

Two unfractionated samples of phenolphthalein poly(aryl ether sulfone) (PES-C) were characterized in CHCl 3 at 25ЊC by applying a recently developed laser light-scattering (LLS) procedure. The Laplace inversion of precisely measured intensity-intensity time correlation function lead us first to an estimate of the characteristic line-width distribution G(G) and then to the translational diffusion coefficient distribution G(D). A combination of static and dynamic LLS results enabled us to determine D Å (2.69 1 10 04 )M 00.553 , which agrees with the calibration of D Å (2.45 1 10 04 )M 00.55 previously established by a set of narrowly distributed PES-C samples. Using this newly obtained scaling between D and M, we were able to convert G(D) into a differential weight distribution f w (M) for the two PES-C samples. The weight-average molecular weights calculated from f w (M) are comparable to that obtained directly from static LLS. Our results showed that using two broadly distributed samples instead of a set of narrowly distributed samples have provided not only similar final results, but also a more practical method for the PES-C characterization.