Compressive behavior of microcellular polystyrene foams processed in supercritical carbon dioxide

被引:85
作者
Arora, KA [1 ]
Lesser, AJ [1 ]
McCarthy, TJ [1 ]
机构
[1] Univ Massachusetts, Dept Polymer Sci & Engn, Amherst, MA 01003 USA
关键词
D O I
10.1002/pen.10375
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Microcellular polystyrene foams have been prepared using supercritical carbon dioxide as the foaming agent. The cellular structures resulting from this process have been shown to have a significant effect on the corresponding mechanical properties of the foams. Compression tests were performed on highly expanded foams having oriented, anisotropic cells. For these materials an anisotropic foam model can be used to predict the effect of cell size and shape on the compressive yield stress. Beyond yield, the foams deformed heterogeneously under a constant stress. Microstructural investigations of the heterogeneous deformation indicate that the dominant mechanisms are progressive microcellular collapse followed by foam densification. The phenomenon is compared to the development of a stable neck commonly observed in polymers subjected to uniaxial tension, and a model that describes the densification process is formulated from simple energy balance considerations.
引用
收藏
页码:2055 / 2062
页数:8
相关论文
共 24 条
[1]   Preparation and characterization of microcellular polystyrene foams processed in supercritical carbon dioxide [J].
Arora, KA ;
Lesser, AJ ;
McCarthy, TJ .
MACROMOLECULES, 1998, 31 (14) :4614-4620
[2]   LOW-DENSITY, MICROCELLULAR POLYSTYRENE FOAMS [J].
AUBERT, JH ;
CLOUGH, RL .
POLYMER, 1985, 26 (13) :2047-2054
[3]   A microcellular processing study of poly(ethylene terephthalate) in the amorphous and semicrystalline states .1. Microcell nucleation [J].
Baldwin, DF ;
Park, CB ;
Suh, NP .
POLYMER ENGINEERING AND SCIENCE, 1996, 36 (11) :1437-1445
[4]   A microcellular processing study of poly(ethylene terephthalate) in the amorphous and semicrystalline states .2. Cell growth and process design [J].
Baldwin, DF ;
Park, CB ;
Suh, NP .
POLYMER ENGINEERING AND SCIENCE, 1996, 36 (11) :1446-1453
[5]  
BALDWIN DF, 1993, SOC PLAST E, V39, P1840
[6]  
Cha S. W., 1992, Patent No. [5,158,986, 5158986]
[7]   PLASTICIZATION OF GLASSY-POLYMERS BY CO2 [J].
CHIOU, JS ;
BARLOW, JW ;
PAUL, DR .
JOURNAL OF APPLIED POLYMER SCIENCE, 1985, 30 (06) :2633-2642
[8]   IN-SITU MEASUREMENT OF THE GLASS-TRANSITION TEMPERATURE OF POLYMERS WITH COMPRESSED FLUID DILUENTS [J].
CONDO, PD ;
JOHNSTON, KP .
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, 1994, 32 (03) :523-533
[9]  
Gibson L., 1989, Advances in Polymer Technology, V9
[10]  
GIBSON LJ, 1989, AMD S SER ASME APPL, V99, P41