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Murphy, W. R.
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document
Polymorphism and crystallisation in metallocene PP-copolymer nanocomposites
Abstract
<p>The structures, polymorphism and crystallisation behaviour of a range of maleated and acrylated polypropylene (PP) layered-silicate nanocomposites were studied using wide-angle X-ray diffraction (WAXD), small-angle X-ray diffraction (SAXD), transmission electron microscopy (TEM), differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) techniques. The dispersed silicate layers were shown to restrict the γ-crystalline phase and selectively suppress the (220), (040) and (060) crystallographic planes of the PP. The PP crystallinity and crystallisation temperature decreased with an increasing degree of layered-silicate intercalation and exfoliation, by up to 26% and 10 degC respectively. This is attributed partly to interaction of the polymer and layered-silicate with the compatibiliser. The unique damping mechanism of the silicate layers reduced the PP β-phase glass transition temperature (T<sub>g</sub>). The endothermic crystalline peak pattern of the compatibiliser, determined by DSC was found to be a novel technique for characterising the degree of layered-silicate exfoliation in the PP matrix.</p>