2014
DOI: 10.1016/j.apcata.2014.01.028
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A review of clay-supported Ziegler–Natta catalysts for production of polyolefin/clay nanocomposites through in situ polymerization

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Cited by 87 publications
(33 citation statements)
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“…Such materials are desired for a combination of high energy densities, high permittivity, mechanical flexibility, and processability (131). Active catalyst formulations are indeed available using clay minerals, such as montmorillonite and kaolin, along with MAO and metallocene (132), preferably by adding MAO-metallocene premix to clay (133). Incorporation of a polyhedral oligomeric silsesquioxane (POSS) on a side chain via incorporation of a norbornyl-substituted POSS reportedly imbues polypropylene with enhanced thermooxidative stability (134).…”
Section: Silicamentioning
confidence: 98%
“…Such materials are desired for a combination of high energy densities, high permittivity, mechanical flexibility, and processability (131). Active catalyst formulations are indeed available using clay minerals, such as montmorillonite and kaolin, along with MAO and metallocene (132), preferably by adding MAO-metallocene premix to clay (133). Incorporation of a polyhedral oligomeric silsesquioxane (POSS) on a side chain via incorporation of a norbornyl-substituted POSS reportedly imbues polypropylene with enhanced thermooxidative stability (134).…”
Section: Silicamentioning
confidence: 98%
“…This avoids the steric hindrance caused by the surface of the support that tends to hinder the access of monomer to the active sites, and also removes impurities. The fixation of MAO in the hydroxyl groups of clays can lead to the formation, after the addition of the metallocene complex, of stabilized catalytic sites which are similar to those of the homogeneous precursor catalysts …”
Section: Introductionmentioning
confidence: 99%
“…The fixation of MAO in the hydroxyl groups of clays can lead to the formation, after the addition of the metallocene complex, of stabilized catalytic sites which are similar to those of the homogeneous precursor catalysts. [13,14] Some researchers have also utilized triisobutylaluminum (TIBA) for chemical pretreatment of the support. The TIBA fixing mechanism in the support (clay) consists basically of two steps as follows: First of all, TIBA is added to a suspension of clay where the Si-OH acidic groups from clay surface react with the aluminum alkyl to produce a heterogeneous cocatalyst, aluminoxane, which prevents the deactivation of the metallocene complex that will be added in the next step.…”
Section: Introductionmentioning
confidence: 99%
“…Mixing these two categories of materials, that is, polymers and nanoparticles has been led to produce polymeric nanocomposites as an attractive field with applicable yields. There are four methods in preparation of the polymer nanocomposites including melt intercalation, template synthesis, exfoliation adsorption, and in situ polymerization intercalation . But, using these methods met limitations due to the presence of the some disadvantages such as grain growth, aggregation, and low distribution in polymer matrix .…”
Section: Introductionmentioning
confidence: 99%