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The gelation of plastisols: An automatic method for the determination of plastisol temperature‐rheology characteristics
Author(s) -
Alter Harvey
Publication year - 1959
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1959.070020609
Subject(s) - materials science , rheology , composite material , viscosity , casting , thermocouple , plasticizer , viscometer , polymer
A technique is described for the small scale evaluation of plastisol formulations for molding, casting, coating, and foam applications. The technique described rapidly measures and automatically records the viscosity of a plastisol as a function of temperature by means of a Bendix Ultra‐Viscoson and thermocouple. The measurements are made under conditions that closely approach process conditions. Small changes are accurately followed and the portion of the curve in the vicinity of gelation is amplified. The shape and position of the viscosity‐temperature plot are dependent on the chemical nature of the plasticizer as well as the intrinsic viscosity and molecular weight distribution of the dispersed polymer. The resulting curves can be used to choose plastisol compositions for a given application. The application of the curves to foam and rotational casting formulations is outlined.