Micro and Nano-Structure in Polypropylene/Clay Nanocomposites

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DOIResolve DOI: http://doi.org/10.1016/j.polymer.2005.09.076
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Journal titlePolymer
Pages1162411634; # of pages: 11
SubjectPolymer nanocomposites; Microstructure; Clay dispersion
AbstractPolypropylene (PP)/clay nanocomposites prepared by melt blending using different clays and coupling agents based on maleic anhydridegrafted PP (MA-PP) were studied. Clay dispersion using field emission gun scanning electron microscope (FEG-SEM) and transmission electron microscopy (TEM), and PP matrix morphology were characterized. Clay dispersion was improved in the presence of MA-PP, as shown by the higher particles surface density (number of particles/mm2) at all micro-, sub-micro- and nano-levels. The PP spherulite diameter was affected by both the presence of MA-PP and clay dispersion. Clay intercalation, characterized by both complementary X-ray diffraction (XRD) and TEM, was greatly influenced by the characteristics of MA-PP. The use of low molecular weight (Mw) MA-PP led to a good and uniform intercalation but with no further possibility to exfoliation. The use of higher Mw MA-PP led to a heterogeneous intercalation with signs of exfoliation. The crystallization behavior of nanocomposites was studied by differential scanning calorimetry (DSC). When fine clay dispersion was achieved with MA-PP, clay-nucleating effect was limited and lower crystallization temperature and rates were observed. It was also shown by wide angle X-ray diffraction (WAXD) that clay induced some orientation of a-phase PP crystallites.
Publication date
AffiliationNational Research Council Canada (NRC-CNRC); NRC Industrial Materials Institute
Peer reviewedYes
NRC number48840
NPARC number15966871
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Record identifier512a746e-2067-4416-a72b-5ae5ef8fc898
Record created2010-12-10
Record modified2016-05-09
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