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

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Describes study in developing an environmentally benign styrene foam using supercritical CO2.

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16 p.

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Ogunsona, Emmanuel O.; Dagnon, Koffi L. & D'Souza, Nandika Anne, 1967- December 19, 2019.

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Describes study in developing an environmentally benign styrene foam using supercritical CO2.

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16 p.

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Abstract: Developing an environmentally benign styrene foam is a critical environmental need. Supercritical CO2 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 CO2 interact and impact nucleation efficiency and performance in supercritical CO2 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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  • Polymers, 12(1), Multidisciplinary Digital Publishing Institute, December 2019

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  • Volume: 12
  • Issue: 1
  • Pages: 16
  • Peer Reviewed: Yes
  • Publication Title: Polymers

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  • December 19, 2019

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  • May 11, 2020, 3:41 p.m.

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  • June 30, 2020, 11:05 a.m.

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Ogunsona, Emmanuel O.; Dagnon, Koffi L. & D'Souza, Nandika Anne, 1967-. Multi-Fold Enhancement in Compressive Properties of Polystyrene Foam Using Pre-delaminated Stearate Functionalized Layer Double Hydroxides, article, December 19, 2019; [Basel, Switzerland]. (https://digital.library.unt.edu/ark:/67531/metadc1638181/: accessed May 26, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT College of Engineering.

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