A one-point intrinsic viscosity method for polyethylene and polypropylene

✍ Scribed by J. H. Elliott; K. H. Horowitz; T. Hoodock

• Publisher: John Wiley and Sons
• Year: 1970
• Tongue: English
• Weight: 765 KB
• Volume: 14
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1970.070141203

✦ Synopsis

Abstract

A statistical analysis of dilute solution viscosity data for a wide range of polyethylene and polypropylene samples in Decalin at 135°C has shown that the Martin equation
fits the experimental data better than the Huggins equation
at higher values of [η]c. A grand average k of 0.139 is applicable to both polymers. Based upon this, tables have been calculated permitting the ready determination of [η] from a single relative viscosity measurement at a known concentration. The Martin equation has been put into a universal form, permitting [η] to be calculated from a measured η~sp~ if k and c are known. Graphs relating η~sp~ to [η] are included for use of the Martin equation over wide ranges of both k and c. It was found that the Solomon and Ciuta equation
fits the experimental polyethylene and polypropylene data, and the reasons for this are discussed.