Strategies for optimizing polypropylene-clay nanocomposite structure

Darrell Marchant, Krishnamurthy Jayaraman

    Research output: Research - peer-reviewArticle

    • 98 Citations

    Abstract

    The structure of nanocomposites produced by melt-mixing polypropylene and 5 wt % of organically modified layered silicates with varying amounts of different maleated polypropylene compatibilizer grades has been analyzed with X-ray diffraction, transmission electron microscopy (TEM), and melt rheology. The extent of delamination in different nanocomposites has been quantified from analysis of several TEM images for each specimen by a product of the single particle volume fraction and the intrinsic viscosity of such particles. This measure correlated directly with the low shear relative viscosity of the molten composites (relative to the silicate free mixture of polypropylene and compatibilizer). The results also indicate that the acid number alone is not a good predictor of compatibilizer effectiveness, i.e., the amount required for exfoliation. The molar ratio of functional groups to compatibilizer chains is found to be a better parameter for ranking compatibilizer effectiveness than the acid number, which is a weight ratio. With higher values of the molar ratio, lower concentrations of compatibilizer are required for significant exfoliation. With the highest molar ratio compatibilizer, an optimum compatibilizer concentration of about 10 wt % leads to a composite with the most exfoliated structure.

    LanguageEnglish (US)
    Pages6402-6408
    Number of pages7
    JournalIndustrial and Engineering Chemistry Research
    Volume41
    Issue number25
    StatePublished - Dec 11 2002

    Profile

    transmission electron microscopy
    viscosity
    silicate
    melt
    clay
    acid
    particle
    Compatibilizers
    Polypropylenes
    Nanocomposites
    Clay
    delamination
    rheology
    functional group
    ranking
    X-ray diffraction
    parameter
    product
    analysis
    Silicates

    ASJC Scopus subject areas

    • Polymers and Plastics
    • Environmental Science(all)
    • Chemical Engineering (miscellaneous)

    Cite this

    Strategies for optimizing polypropylene-clay nanocomposite structure. / Marchant, Darrell; Jayaraman, Krishnamurthy.

    In: Industrial and Engineering Chemistry Research, Vol. 41, No. 25, 11.12.2002, p. 6402-6408.

    Research output: Research - peer-reviewArticle

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