Microcellular Composite Foams

Nyitray, A.; Williams, Jean

doi:10.1177/0021955x8902500302

Journal of Cellular Plastics

1989

DOI: 10.1177/0021955x8902500302

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Microcellular Composite Foams

A. Nyitray

Jean Williams

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Cited by 13 publications

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“…Graphical representation comparing (a) relative modulus (E r ) models to experimentally determined data as a function of the LDH concentration and benchmarking the percentage increase in (b) compressive modulus and (c) compressive strength of experimental data against PS composites from in the literature, due to incorporation of fillers[31,[35][36][37].…”

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confidence: 99%

Multi-Fold Enhancement in Compressive Properties of Polystyrene Foam Using Pre-delaminated Stearate Functionalized Layer Double Hydroxides

2019

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Developing an environmentally benign styrene foam is a critical environmental need. Supercritical CO 2 use in foams has proven to be a valuable path. Adding fillers to increase bubble nucleation has been pursued concurrently. A prominent filler used is high surface area fillers, such as smectic clays. However, all studies to date show a limit of 152% in compressive moduli and 260% in the compressive stress. The values, even with such gains, limit structural application. A seminal work in 1987 by Suh and Cotton proved that carbonyl linkages in calcium carbonates and CO 2 interact and impact nucleation efficiency and performance in supercritical CO 2 foams. In this paper, a high surface area clay (layer double hydroxides) which begins in an exfoliated state, then functionalized with a long chain alkyl carboxylate (stearic acid) is synthesized. The result is a remarkable multi-fold improvement to the compressive properties in comparison to polystyrene (PS); a 268% and 512% increase in compressive modulus and strength, respectively. Using a pre-delaminated approach, the higher surface area was achieved in the clays. The presence of the stearate improved the interactions between the clay galleries and PS through hydrophobic-hydrophobic interactions. The glass transition temperature of the nanocomposites was observed to shift to higher values after foaming. The results point to a new path to increase performance using a pre-delaminated clay with functional groups for environmentally benign foams.

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Multi-Fold Enhancement in Compressive Properties of Polystyrene Foam Using Pre-delaminated Stearate Functionalized Layer Double Hydroxides

2019

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The elastic and plastic mechanical responses of microcellular foams

Özkul

Mark

Aubert

1993

J of Applied Polymer Sci

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SYNOPSISMicrocellular foams were prepared by the thermally induced phase-separation technique, which yields materials having very small cell dimensions (0.1-20 pm) . The polymers employed were isotactic polystyrene, polyacrylonitrile, poly (4-methyl-l-pentene), polyurethane, and Lycram and the resulting foams all had densities in the range 0.04-0.27 g ~m -~. Values of Young's modulus and the collapse stress for these foams were measured and compared with predictions for conventional foams containing defects. Also investigated were plastic deformations, some time-dependent behavior, and Poisson's ratio.

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Leveraging federal research and development for united states science and technology

Hecker¹

1990

Metall Trans A

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Microcellular Composite Foams

Cited by 13 publications

References 8 publications

Multi-Fold Enhancement in Compressive Properties of Polystyrene Foam Using Pre-delaminated Stearate Functionalized Layer Double Hydroxides

Multi-Fold Enhancement in Compressive Properties of Polystyrene Foam Using Pre-delaminated Stearate Functionalized Layer Double Hydroxides

The elastic and plastic mechanical responses of microcellular foams

Leveraging federal research and development for united states science and technology

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