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초록· 키워드

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Nanocomposites made of linear low density polyethylene (LLDPE) and organo-modified montmorillonite (O-MMT)were processed by melt compounding from a commercially available premixed LLDPE/nanoclay masterbatch, atdifferent nanoclay loadings, by co-rotating twin-screw extruder. The morphological and dielectric properties ofLLDPE/O-MMT nanocomposites were investigated to understand the structure-dielectric properties relationship inthe nanocomposites. The microstructures of the materials were characterized by wide angle X-ray diffraction (WAXD),scanning electron microscopy (SEM), transmission electron microscopy (TEM) and atomic force microscopy (AFM). Initial findings by FTIR spectroscopy characterization indicated the absence of any chemical interaction betweenLLDPE and nanoclay during the extrusion process, while DSC showed that a 1% wt loading of nanoclay particlesincreased the degree of crystallinity of the nanocomposites samples. On the other hand, XRD, SEM, TEM and AFMindicated that nanoclay layers were intercalated or exfoliated in the LLDPE matrix. A correlation between the structureand dielectric properties of LLDPE/O-MMT nanocomposites was found and discussed.

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