Microcellular Foaming of Layered Double Hydroxide-Polymer Nanocomposites
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Tipus de documentArticle
Data publicació2011
EditorAmerican Chemical Society (ACS)
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Abstract
Microcellular foams of polystyrene (PS), poly(styrene-co-acrylonitrile) (SAN), and poly(methyl methacrylate)
(PMMA) having organically modified layered double hydroxides (LDH) were prepared using a high-pressure CO2 dissolution
foaming process and characterized both structurally and thermo-mechanically. The saturation concentration of CO2 was found to
increase with the incorporation of LDH nanoparticles into the PMMA, while the opposite effect was observed in the PS and SAN
nanocomposites with respect to the pure polymers. The CO2 desorption diffusion coefficient substantially decreased in the
nanocomposites comparatively to the respective pure polymers. The incorporation of hydrotalcite (HT) into the polymers and
subsequent foaming resulted in foams with finer and more isotropic cellular structures, related to a cell nucleation effect promoted by
the particles. No significant differences were found among the several foamed nanocomposites. Both PS and SAN nanocomposite
foams displayed higher glass transition temperatures than the respective unfilled ones, related to a higher amount of residual CO2 in
the last, favoring plasticization. The contrary effect was observed inPMMA, attributed to a combined plasticizing effect promoted by
the higher affinity of PMMA for CO2 and greater interaction with the organically modified HT platelets. Although no significant
differences were found among the several nanocomposite foams and respective unfilled counterparts, the incorporation of HT
limited the reduction observed in the specific storage moduli with foaming, related to a finer cellular structure induced by the HT
particles.
CitacióMartinez, A. [et al.]. Microcellular Foaming of Layered Double Hydroxide-Polymer Nanocomposites. "Industrial & engineering chemistry research", 2011, vol. 50, núm. 9, p. 5239-5247.
ISSN0888-5885
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