How to measure the degradation index by viscometry

✍ Scribed by A. V. Shyichuk

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 277 KB
• Volume: 62
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19961205)62:10<1735::aid-app26>3.0.co;2-z

✦ Synopsis

To calculate the degradation index (DI) from the intrinsic viscosity changes, a simple and accurate enough equation has been proposed DI = { ([q]o/[q])l'a -1}/(0.57 X Pd -0.14),

with Pwo being the initial polydispersity index: P d = MJM,,. The inaccuracy of the DI determination caused by the experimental inaccuracy of intrinsic viscosity measurements was evaluated to be larger at low values of the Mark-Houwink exponent. The determination is more accurate when the initial MWD is broad.