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首页> 外文期刊>Journal of Applied Polymer Science >Controlling the Structure of a Porous Polymer by Coupling Supercritical CO_2and Single Screw Extrusion Process
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Controlling the Structure of a Porous Polymer by Coupling Supercritical CO_2and Single Screw Extrusion Process

机译：通过超临界CO_2和单螺杆挤出工艺耦合控制多孔聚合物的结构

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摘要

A study on the extrusion of Eudragit E100was carried out using supercritical carbon dioxide (scCO_2)as plasticizer and foaming agent. ScCO_2modifies the rheo-logical properties of the material in the barrel of theextruder and acts as a blowing agent during the relaxationwhen flowing through the die. For experiments, a single-screw extruder was modified to be able to inject scCO_2within the extruded material. The aim is to determine a cor-relation between operating conditions and foam structure.The effect of three parameters was studied: the temperaturein the die and in the metering zone, the screw speed, andthe volumetric flow rate of CO_2.An increase in temperatureenhances the expansion rate and the average pore diameter and appears to be the most significant parameter. The effectof CO_2concentration is significantat small concentrationsonly: the higher the CO_2concentration, the lower poredensity and the higher both the pore diameter and theexpansion rate. The effect of the screw speed is trickybecause a variation of this speed involves a decrease of CO_2weight ratio. This study shows that the structure of theextrudates does not evolve with a coupling of screw speedincrease and a subsequent CO_2weight ratio decrease.
机译：以超临界二氧化碳（scCO_2）为增塑剂和发泡剂对Eudragit E100的挤出进行了研究。 ScCO_2改变了挤出机机筒中材料的流变学特性，并在流经模具时的松弛过程中充当了发泡剂。对于实验，对单螺杆挤出机进行了改进，使其能够在挤出的材料中注入scCO_2。目的是确定操作条件与泡沫结构之间的相关性。研究了三个参数的影响：模头和计量区的温度，螺杆速度和CO_2的体积流量。温度的升高增强了膨胀率和平均孔径似乎是最重要的参数。仅在小浓度下，CO_2浓度的影响才显着：CO_2浓度越高，孔隙率越低，孔径和膨胀率越高。螺杆速度的影响是棘手的，因为该速度的变化涉及CO_2重量比的降低。这项研究表明，挤出物的结构不会随着螺杆转速的增加而演化，随后的CO_2重量比也会降低。

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