Effect about Axial Vibration on Solution Viscosities of PS/Supercritical CO₂

Abstract:

In this paper, a technology of determining the melt viscosity of a polystyrene(PS)/supercritical CO₂ solution using a linear capillary tube die mounted on a foaming dynamic extruder is presented. CO₂ was injected into the dynamic extrusion barrel. Single-phase PS/CO₂ solutions were formed using a microcellular extrusion system and phase separation was prevented by maintaining a high pressure in the capillary tube die. By measuring the pressure drop through the die, the viscosity of PS/CO₂, solutions was determined. The dynamic extruder foaming apparatus was developed and using it to study the effects of CO₂ content and vibration on viscosity of PS/CO₂ solution. The blow agents and vibration can plastic the polymer viscosity. A theoretical model based on the generalized Cross-Carreau model was proposed to describe the shear-thinning behavior of PS/CO, solutions at various shear rates. The zeroshearviscosity was modeled using a generalized Arrhenius equation to accommodate the effects of temperature, pressure, CO₂ content, and vibration.

• Periodical: Advanced Materials Research (Volumes 781-784)
• Pages: 419-425
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.781-784.419
• Online since: September 2013
• Authors: Bing Li, Nan Qiao Zhou
• Keywords: PS/Supercritical, Vibration, Viscosity

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