Effect of acrylic processing aids on PVC die swell
| Autor: | David L. Dunkelberger, Jean-Louis G. Pfennig |
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| Rok vydání: | 1986 |
| Předmět: |
Marketing
Blow molding chemistry.chemical_classification Materials science Polymers and Plastics Capillary action General Chemical Engineering General Engineering General Chemistry Polymer Die swell chemistry Rheology Polymerization Materials Chemistry Molar mass distribution Composite material Elasticity (economics) |
| Zdroj: | Journal of Vinyl and Additive Technology. 8:126-131 |
| ISSN: | 1548-0585 0193-7197 |
| DOI: | 10.1002/vnl.730080309 |
| Popis: | The die swell behavior of PVC melts is a manifestation of melt elasticity and is of considerable commercial as well as fundamental importance. This behavior is a critical issue in extrusion blow molding application where die swell (i.e. parison thickness) needs to be controlled. Advantageously, the addition of high molecular weight acrylic processing aids to PVC provides better die swell control, thus, improving dramatically the processability of PVC. Hence, knowledge of molecular weight variables of such acrylic processing aids is important from both the commercial and rheological point of view. Various acrylic processing aids were prepared by polymerization designed to provide systematic variation of molecular parameters. Molecular weight distribution of the polymers was characterized by GPC, and their die swell behavior in a typical PVC blow molding formulation was determined at 200°C over various range of residence times using different L/D capillary dies. The results are presented showing effects of specific molecular variables. |
| Databáze: | OpenAIRE |
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