The effect of clay type and of clay-masterbatch product in the preparation of polypropylene/clay nanocomposites

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DOIResolve DOI: http://doi.org/10.1002/app.34085
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TypeArticle
Journal titleJournal of Applied Polymer Science
ISSN0021-8995
Volume122
Issue3
Pages20132025; # of pages: 13
SubjectClay exfoliation; Clay type; clay-masterbatch; Cloisite; Composite morphology; Degree of dispersion; Direct melt mixing; Dispersability; FEG-SEM; Field emission guns; Flexural properties; Initial decomposition temperatures; Intercalants; Masterbatch; Organo-modified montmorillonites; Processing temperature; Thermal and mechanical properties; Twin screw extruders; Clay minerals; Coupling agents; Extrusion; Maleic anhydride; Mechanical properties; Nanocomposites; Organoclay; Processing; Scanning electron microscopy; Thermoplastics; Transmission electron microscopy; X ray diffraction; Clay products
AbstractClay containing polypropylene (PP) nanocomposites were prepared by direct melt mixing in a twin screw extruder using different types of organo-modified montmorillonite (Cloisite 15 and Cloisite 20) and two masterbatch products, one based on pre-exfoliated clays (Nanofil SE 3000) and another one based on clay-polyolefin resin (Nanomax-PP). Maleic anhydride-grafted polypropylene (PP-g-MA) was used as a coupling agent to improve the dispersability of organo-modified clays. The effect of clay type and clay-masterbatch product on the clay exfoliation and nanocomposite properties was investigated. The effect of PP-g-MA concentration was also considered. Composite morphologies were characterized by X-ray diffraction (XRD), field emission gun scanning electron microscopy (FEG-SEM), and transmission electron microscopy (TEM). The degree of dispersion of organo-modified clay increased with the PP-g-MA content. The thermal and mechanical properties were not affected by organo-modified clay type, although the masterbatch products did have a significant influence on thermal and mechanical properties of nanocomposites. Intercalation/exfoliation was not achieved in the Nanofil SE 3000 composite. This masterbatch product has intercalants, whose initial decomposition temperature is lower than the processing temperature (T ∼ 180°C), indicating that their stability decreased during the process. The Nanomax-PP composite showed higher thermal and flexural properties than pure PP. © 2011 Wiley Periodicals, Inc.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Industrial Materials Institute (IMI-IMI)
Peer reviewedYes
NPARC number21271165
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Record identifier35a39a92-d596-4e38-90f9-c24d14908bf6
Record created2014-03-24
Record modified2016-05-09
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