The elastic and plastic mechanical responses of microcellular foams

Özkul, M. Hulusi; Mark, J. E.; Aubert, J.

doi:10.1002/app.1993.070480502

Cited by 12 publications

(2 citation statements)

References 11 publications

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“…Figure 9 and Table II show that, with a decrease in the relative density, the tensile strengths, the tensile moduli, and the elongation all decreased, as expected. Unfortunately, until now, there were only very limited data reported on the mechanical properties of such microcellular foams 11, 23, 24…”

Section: Resultsmentioning

confidence: 99%

Preparation, characterization, and mechanical properties of some microcellular polysulfone foams

Sun

Mark

2002

J of Applied Polymer Sci

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Several polymers were evaluated as candidates for the production of high-performance microcellular closed-cell foams. The polymers involved were a polysulfone, a polyethersulfone, a polyphenylsulfone, a polyetherimide, and a poly(ether ketone ketone), and their suitability was gauged by measuring rates at which they could be impregnated with carbon dioxide under pressure at room temperature. This step is essential to the subsequent step of heating the impregnated samples at various temperatures to create foamed structures. The present study focused primarily on the use of the polysulfone in this regard. Microcellular foams of this polymer were found to have average cell sizes in the range 1-10 m and cell densities on the order of 10 10 -10 14 cells/cm 3 . The microstructures of these foamed samples were controlled through careful choices of the foaming temperature and the foaming speed to produce a wide range of foam densities. Since these materials were prepared for possible use as structural materials, tensile tests were conducted to investigate the dependence of some of their mechanical properties on the foam densities (relative to those of the unfoamed polymer). The results indicated that the tensile moduli of these polysulfone foams increased with the square of their relative densities, and the tensile strengths were proportional to these densities. Both of these experimental findings are in agreement with theory.

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Section: Resultsmentioning

confidence: 99%

Preparation, characterization, and mechanical properties of some microcellular polysulfone foams

Sun

Mark

2002

J of Applied Polymer Sci

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“…The main reason is that the filler properties and content percent great affect the part impact strength. And SCF has no effect on the fillers [6][7][8][9][10][11][12][13] . Figure 1-5 shows the bend strength, tensile strength and impact strength of PBT (30% GF) on the solid polymer and different weight reduction ratio.…”

Section: Part Mechanical Properitesmentioning

confidence: 99%

Microcellular Foam Injection Molding Process

Hu¹

2012

Some Critical Issues for Injection Molding

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Generation and structure–property behavior of novel liquid crystalline foams produced via a gas supersaturation technique

Risch

Wan

McGrath

et al. 1994

J of Applied Polymer Sci

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SYNOPSISLinear and star-branched polyoxybenzoate-polyoxyphenoxybenzoate copolymers (POBco-POPB) at a 65/35 molar ratio were synthesized via melt acidolysis using AB-type monomers and branching agents. By controlling the molecular weight and topology of these polymers, both melt processability and solid-state COz gas absorption behavior were enhanced. POB-POPB copolymers with a molar ratio 65/35 showed a glass transition of 143°C and completion of melting at ca. 300°C. POB-POBP copolymers with a systematically increasing branching agent content showed a systematically decreasing peak intensity in wide-angle X-ray diffraction, indicating that increasing branch-point concentration leads to a decrease in liquid-crystal ordering. Star-branched POB-POPB copolymers showed greatly enhanced carbon dioxide gas absorption behavior relative to their linear counterparts.Whereas CO, blown foams of linear POB-co-POPB produced by the gas supersaturation technique had a relatively high density and showed highly anisotropic bubble growth, welldefined, nearly isotropic foams of star-branched POB-co-POPB with a mean cell size from 200 to 400 p were made using the gas supersaturation technique. Structural features were characterized via scanning electron microscopy, and mechanical properties were determined by indentation testing with a 0.25 in. ball indenter. These LCP foams exhibit relative mechanical properties similar to polystyrene and microcellular polycarbonate foams.

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The elastic and plastic mechanical responses of microcellular foams

Cited by 12 publications

References 11 publications

Preparation, characterization, and mechanical properties of some microcellular polysulfone foams

Preparation, characterization, and mechanical properties of some microcellular polysulfone foams

Microcellular Foam Injection Molding Process

Generation and structure–property behavior of novel liquid crystalline foams produced via a gas supersaturation technique

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