Use of Dye Containing Polymeric Microcapsules for Determining Shear Stresses
| Autor: | A. C. Condo, B. M. Kosowski, D. C. Clark, W. E. Baker |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
chemistry.chemical_classification
Materials science Polymers and Plastics medicine.diagnostic_test General Chemical Engineering Plastics extrusion Polymer medicine.disease_cause Industrial and Manufacturing Engineering law.invention chemistry Optical microscope Shear (geology) law Spectrophotometry Materials Chemistry medicine Shear stress Composite material Colorimetric analysis Ultraviolet |
| Zdroj: | International Polymer Processing. 13:239-246 |
| ISSN: | 2195-8602 0930-777X |
| DOI: | 10.3139/217.980239 |
| Popis: | This paper evaluates a method of measuring shear stress, in-situ, in polymer flows. The rupture response of two different dye containing polymeric microcapsules, CM511 and CM567, is examined in both an internal batch mixer and a lab scale single screw extruder (SSE), using ultraviolet/visible spectrophotometry (UV/VIS), colorimetric analysis (CA) and optical microscopy (OM). It is observed that both particles rupture over a wide range of shear stresses and times. In particular, both CM511 and CM567 begin to rupture at ∼ 100 kPa, while complete rupture is only detected for the CM567 at average stress levels greater than or equal to ∼ 230 kPa. Complete rupture for the CM511 is not observed over the average shear stress range investigated. The microcapsules further indicate the change in the melting mechanism in a SSE when the processing conditions are changed. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|