Study of the Influence of the Pressure Drop Rate on the Foaming Behavior and Dynamic-Mechanical Properties of CO2 Dissolution Microcellular Polypropylene Foams

被引:24
作者
Antunes, Marcelo [1 ]
Realinho, Vera [1 ]
Ignacio Velasco, Jose [1 ]
机构
[1] Univ Politecn Cataluna, Ctr Calala Plast, Dept Ciencia Mat & Engn Met, E-08222 Terrassa, Barcelona, Spain
关键词
foams; polypropylene; gas-dissolution; carbon dioxide; dynamic-mechanical analysis; SUPERCRITICAL CARBON-DIOXIDE; NANOCOMPOSITE FOAMS; CELL NUCLEATION; BRANCHED POLYPROPYLENE; RHEOLOGICAL PROPERTIES; POLYCARBONATE FOAMS; THERMOPLASTIC FOAM; BLENDS; MORPHOLOGY; EXTRUSION;
D O I
10.1177/0021955X10382609
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
This article presents the preparation of microcellular polypropylene foams produced by a CO2 batch-foaming process and their characterization regarding the influence of the pressure drop rate on the foaming behavior and dynamic-mechanical properties. A polypropylene-based material was prepared by melt-mixing in a twin-screw extruder, cooled, and pelletized and later compression-molded in a hot-plate press to solid discs. These discs were finally foamed inside a high pressure vessel by dissolving CO2 and carefully controlling its sudden decompression drop. The dynamic-mechanical properties of the different expansion ratio-produced PP foams were studied, analyzing the influence of the pressure drop rate and residual pressures on the cellular structure and subsequent dynamic-mechanical behavior of the foams. With increasing the sudden pressure drop by reducing the residual pressure value, higher expansion ratio PP foams were obtained, reaching a maximum value of 3. Only slight differences were observed between foams regarding the cell size (maximum cell size approximate to 100 mm), the foams presenting slightly lower specific storage moduli than that of the solid material, indicating the efficiency of this process in nucleating and generating relatively high expansion ratio foams with a closed-cell type of structure and cell sizes in the micrometer range.
引用
收藏
页码:551 / 571
页数:21
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