Thermosets Brabender plasticorder

Published information on urethane polymerization detail largely concerns thermoset urethane elastomers systems.4 13 In particular, the work of Macosko et. al. is called to attention. The present paper supplements this literature with information on the full course of linear thermoplastic urethane elastomer formation conducted under random melt polymerization conditions in a slightly modified Brabender PlastiCorder reactor. Viscosity and temperature variations with time were continuously recorded and the effects of several relevant polymerization variables - temperature, composition, catalyst, stabilizer, macroglycol acid number, shortstop - are reported. The paper will also be seen to provide additional insight into the nature and behavior of thermoplastic polyurethane elastomers. 

Brabender plasticorder. The plasticorder is a small mixer capable of measuring the viscosity and the gel time of thermosetting molding compounds with results that can be correlated to the performance of a compound during molding conditions. 

The Brabender Plasticorder is a small mixer capable of measuring the viscosity and the gel time of thermosetting molding compounds with results that can be correlated to the performance of a compound during molding conditions. The test samples may be in the form of strips, pellets, or crumbs. The Brabender Plasticorder is often used as a quality control process to ensure consistency in polymerization processes and to test the reactivity of resin formulations. 

The Brabender Plasticorder was introduced as a more sophisticated means for measuring the rheology of thermosetting compounds applied to an extruder screw. There is a need to know the duration of a compound s flow life when exposed to both the initial barrel temperatures as the compound is prepared for its movanent into the mold and when the compound enters the much hotter mold. See also Brabender Plasticorder.)... 

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