Melt compounding of different grades of polystyrene with organoclay : Part 1 : Compounding and characterization

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DOIResolve DOI: http://doi.org/10.1002/pen.20098
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TypeArticle
Journal titlePolymer Engineering and Science
Volume44
Issue6
Pages1046–1060
AbstractNanocomposites of polystyrene (PS) with up to 20 wt% organoclay were prepared by melt compounding in a co-rotating, intermeshing twin-screw extruder. Three grades of PS with different molecular weights were used. In this paper we discuss preparation and characterization of the mixtures. Residence time and its distribution were measured by ultrasonics (US). They were found to be independent of the PS grade, but the US attenuation and sound velocity varied with the organoclay loading. According to the XRD diffraction data, the organoclay was dispersed into two types of platelet stacks evidenced by the diffraction peaks at about 2θ = 2.1 and 5.5°, i.e., with the interlayer spacings of d₀₀₁ = 4.20 and 1.6 nm, respectively. Since neat organoclay has d₀₀₁ = 1.93 nm, the first peak indicates intercalation by PS and the other a collapse of the interlamellar gallery during compounding. The XRD spectra depended on the organoclay content, but not on PS grade. According to TEM analysis, the degree of intercalation of organoclay in the polymer matrix is highest for the low-molecular-weight polystyrene. TEM results also confirm the collapse of interlamellar spacing in parts of the samples. FT-IR spectroscopy showed that there was some thermal degradation of the onium compound present in the nanoclay.
Publication date
LanguageEnglish
AffiliationNRC Industrial Materials Institute; National Research Council Canada
Peer reviewedNo
NRC number54250
NPARC number18335939
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Record identifier98ada9ac-0044-4af1-b212-868bf563bbe6
Record created2011-07-29
Record modified2016-05-09
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