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A one‐point intrinsic viscosity method for polyethylene and polypropylene

1970; Wiley; Volume: 14; Issue: 12 Linguagem: Inglês

10.1002/app.1970.070141203

1097-4628

John H. Elliott, K. H. Horowitz, T. Hoodock,

Rheology and Fluid Dynamics Studies

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.