Foam extrusion characteristics of thermoplastic resin with fluorocarbon blowing agent. II. Polystyrene foam extrusion
| Autor: | Chang Dae Han, Chin-Yuan Ma |
|---|---|
| Rok vydání: | 1983 |
| Předmět: |
chemistry.chemical_classification
Materials science business.product_category Thermoplastic Polymers and Plastics General Chemistry Die swell Surfaces Coatings and Films Shear rate chemistry.chemical_compound chemistry Blowing agent Materials Chemistry Die (manufacturing) Extrusion Polystyrene Fluorocarbon Composite material business |
| Zdroj: | Journal of Applied Polymer Science. 28:2983-2998 |
| ISSN: | 1097-4628 0021-8995 |
| DOI: | 10.1002/app.1983.070280924 |
| Popis: | The foam extrusion characteristics of three different grades of polystyrene resin were investigated. For the study, cylindrical dies with various values of length-to-diameter ratio, entrance angle, and reservior-to-capillary diameter ratio were used. Fluorocarbon blowing agents were used, and mixtures of citric acid and sodium bicarbonate were used as nucleating agent. It was found that the die temperature, shear rate, the type and concentration of blowing agent, and die geometry affect the quality of the extruded polystyrene foam. Foam density and open cell fraction were used in determining the quality of extruded foams. We have found that the extrudate swell ratio is correlatable to foam density, independent of the die temperature employed. However, the die temperature has been found to be a very sensitive processing variable governing the quality of extruded foams. |
| Databáze: | OpenAIRE |
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