Abstract
Abstract In the continuous molding of microporous plastics, the polymer/CO2 homogeneous body needs to be formed in a very short time, which affects the subsequent bubble nucleation, bubble pore distribution, and growth, and is the key to the molding. It is known that the formation time of homogeneous body is shortened during the continuous molding of microporous plastics because of the agitator’s effect. However, different agitators have different effects on the dissolution rate. So, it is necessary to study not only the dissolution of gas in polymer melt under static condition but also the dissolution under the action of the agitator. In this article, the solubility and dissolution rate of supercritical CO2 in polymer melt PS at different temperatures and pressures were experimentally investigated under conical and screw agitators, and the numerical solution was also carried out.
Highlights
Microporous plastics have many superior comprehensive properties, such as lightweight, high impact strength, good toughness, low conductivity, sound, and heat insulation effect [1,2,3,4]
Continuous extruding forming means that the polymer is transported and melted by the extruder, and supercritical CO2 is dissolved into the polymer melt through the injection port on the machine barrel in the homogenization stage
CO2 rapidly dissolves under the action of the agitator in the machine barrel, forming polymer/CO2 homogeneous body
Summary
Microporous plastics have many superior comprehensive properties, such as lightweight, high impact strength, good toughness, low conductivity, sound, and heat insulation effect [1,2,3,4]. CO2 rapidly dissolves under the action of the agitator in the machine barrel, forming polymer/CO2 homogeneous body. In the continuous molding of microporous plastics, the polymer/CO2 homogeneous body needs to be formed in a very short time, which affects the subsequent bubble nucleation, bubble pore distribution, and growth, and is the key to the molding [12,13,14,15]. Whether the polymer melt can dissolve as much supercritical CO2 as possible within the process time depends on the dissolution rate. 444 Long Wang et al. it is known that the formation time of the homogeneous body is decreased during the continuous molding of microporous plastics because of the agitator’s effect. Under different agitators, the dissolution of supercritical CO2 in polymer melt PS was studied experimentally, and the numerical solution was carried out
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