Dynamic melt flow of nanocomposites based on poly-ε-caprolactam

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DOIResolve DOI: http://doi.org/10.1007/s003970100211
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Journal titleRheologica Acta
Pages383482; # of pages: 100
SubjectPolymeric nanocomposites; dynamic melt flow; organoclay; montmorillonite; poly-ε-caprolactam; platelets suspensions; aspect ratio
AbstractThe dynamic flow behavior of polyamide-6 (PA-6) and a nanocomposite (PNC) based on it was studied. The latter resin sontained 2 wt% of organoclay. The two materials were blended in proportions of 0, 25, 50, 75, and 100 wt% PNC. The dynamic shear rheological properties of well-dried specimens were measured under N2 at T = 240 °C, frequency ω=0.1-100 rad/s, and strains γ=10 and 40%. At constant T, γ, and ω the time sweeps resulted in significant increases of the shear moduli. The γ and ω scans showed a complex rheological behavior of all clay-containing specimens. At γ=10% the linear viscoelasticity was observed for all compositions only at ω>1 rad/s, while at γ=40% only for 0 and 25 wt% of PNC. However, the effect was moderate, namely decreasing G' and G'' (at ω=6.28 rad/s; γ=50%) by 15 and 7.5%, respectively. For compositions containing >25 wt% PNC two types of non-linearity were detected. At ω≤ωc=1.4 ± 0.2 rad/s yield stress provided evidence of a 3-D structure. At ω > ωc, G' and G'' were sensitive to shear history - the effect was reversible. From the frequency scans at ω > ωc the zero-shear relative viscosity vs concentration plot was constructed. The initial slope gave the intrinsic viscosity from which the aspect ratio of organoclay particles, p = 287 ± 9 was calculated, in agreement with the value calculated from the reduced permeability data, p = 286.
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AffiliationNRC Industrial Materials Institute; National Research Council Canada
Peer reviewedYes
NRC number45052
NPARC number18382809
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Record identifierf4f94f87-d0d3-4d72-9c44-611087628ee8
Record created2011-08-05
Record modified2016-05-09
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