Extrusion of linear polypropylene-clay nanocomposite foams

Amit Kumar Chaudhary, Krishnamurthy Jayaraman

    Research output: Contribution to journalArticle

    • 25 Citations

    Abstract

    This work presents new results on using organoclay with an appropriate polymeric compatibilizer as rheology-modifying additives for extrusion foaming of a linear polypropylene (PP), which by itself does not display strain hardening in extensional flow of the melt. The uniaxial melt-extensional viscosity behavior of several nanocomposites prepared with varying ratio of bound maleic anhydride to clay as well as varying compatibilizer molecular weight was investigated. A chemical-blowing agent was used at a fixed concentration for foaming these nanocomposites in a single-screw extruder. Among nanocomposites with similar levels of clay dispersion or intercalation, the ones that displayed significant strain hardening in the melt state along with slower crystallization led to extruded PP nanocomposite foams with smaller cell sizes and greater cell density by reducing cell coalescence. This was achieved with as little as 3 wt% organoclay and a high-molecular weight PP-g-MA compatibilizer in linear PP. POLYM. ENG. SCI., 2011.

    Original languageEnglish (US)
    Pages (from-to)1749-1756
    Number of pages8
    JournalPolymer Engineering and Science
    Volume51
    Issue number9
    DOIs
    StatePublished - Sep 2011

    Profile

    Polypropylenes
    Nanocomposites
    Laryngeal Mucosa
    Compatibilizers
    Clay
    Dihydropteroate Synthase
    Organoclay
    Strain hardening
    Extrusion
    Foams
    Molecular weight
    Amino Acid Chloromethyl Ketones
    Dextrothyroxine
    Ambroxol
    Blowing agents
    Maleic anhydride
    Extruders
    Intercalation
    Coalescence
    Rheology

    ASJC Scopus subject areas

    • Polymers and Plastics
    • Materials Chemistry
    • Chemistry(all)

    Cite this

    Extrusion of linear polypropylene-clay nanocomposite foams. / Chaudhary, Amit Kumar; Jayaraman, Krishnamurthy.

    In: Polymer Engineering and Science, Vol. 51, No. 9, 09.2011, p. 1749-1756.

    Research output: Contribution to journalArticle

    Chaudhary, Amit Kumar; Jayaraman, Krishnamurthy / Extrusion of linear polypropylene-clay nanocomposite foams.

    In: Polymer Engineering and Science, Vol. 51, No. 9, 09.2011, p. 1749-1756.

    Research output: Contribution to journalArticle

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    abstract = "This work presents new results on using organoclay with an appropriate polymeric compatibilizer as rheology-modifying additives for extrusion foaming of a linear polypropylene (PP), which by itself does not display strain hardening in extensional flow of the melt. The uniaxial melt-extensional viscosity behavior of several nanocomposites prepared with varying ratio of bound maleic anhydride to clay as well as varying compatibilizer molecular weight was investigated. A chemical-blowing agent was used at a fixed concentration for foaming these nanocomposites in a single-screw extruder. Among nanocomposites with similar levels of clay dispersion or intercalation, the ones that displayed significant strain hardening in the melt state along with slower crystallization led to extruded PP nanocomposite foams with smaller cell sizes and greater cell density by reducing cell coalescence. This was achieved with as little as 3 wt% organoclay and a high-molecular weight PP-g-MA compatibilizer in linear PP. POLYM. ENG. SCI., 2011.",
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