Rheological properties of mixtures of molten polymer and fluorocarbon blowing agent. II. Mixtures of polystyrene and fluorocarbon blowing agent

Autor:	Chin-Yuan Ma, Chang Dae Han
Rok vydání:	1983
Předmět:	chemistry.chemical_classification Materials science Polymers and Plastics Dichlorodifluoromethane General Chemistry Polymer Surfaces Coatings and Films Shear rate chemistry.chemical_compound Viscosity chemistry Rheology Blowing agent Materials Chemistry Fluorocarbon Polystyrene Composite material
Zdroj:	Journal of Applied Polymer Science. 28:851-860
ISSN:	1097-4628 0021-8995
DOI:	10.1002/app.1983.070280235
Popis:	The viscosities of mixtures of polystyrene and fluorocarbon blowing agent were determined, using the experimental technique described in Paper I of this series. For the study, three commercial grades of polystyrene were used, together with the following fluorocarbon blowing agents, trichlorofluoromethane (FC-11), dichlorodifluoromethane (FC-12), and blends of FC-11 and FC-12. For each combination of polystyrene and blowing agent, blowing agent concentration and melt temperature were varied. We have found that, for all three polystyrenes used, a single correlation exists between the viscosity reduction factor (VRF) and the blowing agent concentration, in which VRF is defined as the ratio of the viscosity of polystyrene-blowing agent mixture to that of polystyrene homopolymer. The correlation was found to be independent of shear rate and temperature, and dependent upon only the type of fluorocarbon blowing agent. It was suggested that such a correlation be used in predicting the bulk viscosity of mixtures of polystyrene and fluorocarbon blowing agent, using information on the viscosity of polystyrene alone.
Databáze:	OpenAIRE
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