Synthesis of nanocomposites by in situ metallocene-catalyzed polymerization of propene

Zakrzewska, S.; Ouros, Aline Cristiane dos; Schramm, Norbert; Jehnichen, Dieter; Häußler, Liane; Pospiech, Doris; Voit, Brigitte; Schulze, Ulrich; Pastore, Heloise O.

doi:10.1016/j.eurpolymj.2014.12.007

Cited by 4 publications

(1 citation statement)

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“…MAO activates the metallocene dichloride, thereby generating the near‐surface‐anchored active catalyst species, which induces polymer formation close to the filler surface. It is inferred that this procedure leads to a powdery product . The MAO was allowed to interact with the filler surface for 45–60 min prior to injection of the catalyst precursor.…”

Section: Resultsmentioning

confidence: 99%

Isotactic polypropylene metal oxide and silica nanocomposites by a two‐step process comprising in situ olefin polymerization and melt compounding

Käselau

Scheel

Petersson

et al. 2019

Polymer International

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Nanocomposites of isotactic polypropylene (iPP) with 0.5 wt% filler of MgO@Mg(OH)2 (35 nm) or silicon dioxide (20–60 nm) or barium titanate (50 nm) nanoparticles were obtained from melt compounding of filler masterbatches with commercial iPP. The masterbatches with 5 wt% nanofiller were prepared in an in situ polymerization procedure using a metallocene/methylaluminoxane (MAO) catalyst system that was supported on the respective oxides. The original agglomerates of the nanoparticles were broken up by treatment with dibutylmagnesium for MgO@Mg(OH)2, and with ultrasound in the presence of MAO for SiO2 and BaTiO3. The tacticity (98% mmmm) of the in situ formed PP was not influenced by the presence of the nanofillers. Scanning electron microscopy and energy‐dispersive X‐ray spectroscopy mapping show a fine dispersion of single particles and small clouds or clusters. The primary nanoparticles appear to be surrounded by polymer. The elongation at break was decreased to 50, 17 and 9% for MgO@Mg(OH)2), SiO2 and BaTiO3, respectively. After melt compounding with iPP, a homogeneous single‐particle distribution of the oxidic nanoparticles was found in the resulting composites with 0.5 wt% filler content. © 2019 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%