Uniaxial compaction behavior of filled polymer powders

✍ Scribed by S. K. Bhateja; J. R. Gilbert; E. H. Andrews

• Publisher: John Wiley and Sons
• Year: 1987
• Tongue: English
• Weight: 499 KB
• Volume: 33
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1987.070330704

✦ Synopsis

Synopsis

A simple method is deacribed to obtain rheological data on filled polymeric materials in the form of powders. The powder is compacted in a cylindrical chamber by a plunger driven by the crass-head in an Instron testing machine and the load-displacement curve is recorded. Further information is obtained by compressing the powder to a fixed load and measuring the load decay with time (stress-relaxation). The tests are illustrated by application to "monocomponent toner" powders used in dry copying or nonimpact printing procesaea It is shown that compaction and stress-relaxation data are able to differentiate between different toners and facilitate the prediction of their relative performances in terms of pressure fusing. A mechanical spring-dashpot-slider model is effective in deacribing the rheological behavior of these powders and its dependence on the loading of a hard filler (magnetic pigment). The latter affects the "slider" yield stress in the model but has no influence on the relaxation times.