Dynamic light-scattering characterization of the molecular weight distribution of a broadly distributed phenolphthalein poly(aryl ether ketone)

✍ Scribed by Mohammad Siddiq; Chi Wu; Binyao Li

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 336 KB
• Volume: 60
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19960613)60:11<1995::aid-app24>3.0.co;2-z

✦ Synopsis

Using a recently developed laser light-scattering (LLS) procedure, we accomplished the characterization of a broadly distributed unfractionated phenolphthalein poly(ary1 ether ketone) (PEK-C) in CHC13 at 25°C. The laplace inversion of precisely measured intensityintensity time correlation function from dynamic LLS leads us first to an estimate of the characteristic line-width distribution G ( r ) and then to the translational diffusion coefficient distribution G(D). By using a previously established calibration of D (cm2/s) = 2.37

, we were able to convert G(D) into a differential weight distribution f,(M). The weight-average molecular weight M , calculated from f,(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.