Rheological Measurements for the Characterization of High Polymers

Autor:	Kurt Edelmann, Edith Horn
Rok vydání:	1958
Předmět:	Theoretical physics Materials science Polymers and Plastics Rheology Flow (mathematics) Inflection point Measuring principle Materials Chemistry Shear stress Viscometer Mechanics Critical ionization velocity Constant (mathematics)
Zdroj:	Rubber Chemistry and Technology. 31:681-690
ISSN:	1943-4804 0035-9475
DOI:	10.5254/1.3542326
Popis:	Since the Umstätter structural viscometer represents the only viscometer that operates on the capillary principle, the most accurate measuring principle in viscometry, with a shear stress range above 104, this paper describes the necessary steps, from the long term experience of the authors with this apparatus, which permit a rapid and true determination of a complete flow curve. Also the necessary calculations are given and explained in an example. From this method, the critical velocity gradient G^, the inflection point of the flow curve, was obtained as a characteristic material constant, dependent only on the molecular weight of the high polymer and its absolute value for inhomogeneity. It is the hope of the authors that scientific practice for characterizing high polymers will increasingly refer to the flow behavior of (their) solutions by determining the flow curve.
Databáze:	OpenAIRE
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