✦ LIBER ✦

Polyethylene-montmorillonite nanocomposites obtained by in situ polymerization of ethylene with nickel-diimine catalysts

✍ Scribed by Marcelo Luis Mignoni; Jonathan Vaz Martins Silva; Michèle Oberson de Souza; Raquel dos Santos Mauler; Roberto Fernando de Souza; Katia Bernardo-Gusmão

Publisher: John Wiley and Sons
Year: 2011
Tongue: English
Weight: 348 KB
Volume: 122
Category: Article
ISSN: 0021-8995
DOI: 10.1002/app.34358

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✦ Synopsis

Nanocomposites of exfoliated montmorillonite in polyethylene were obtained using a combination of 1,4-bis(2,6-diisopropylphenyl)-acenaphthenediimine-dichloronickel(II), montmorillonite, and methylalumoxane (MAO) or trimethylaluminum (TMA) to polymerize ethylene. The properties of the polymers were strongly influenced by the amount of clay they contained. The addition of 2.5% commercial montmorillonite (KSF or Cloisite 15A) enhanced the storage modulus from 5 to 878 MPa. Transmission electron microscopy (TEM) analyses provided evidence of exfoliation of the montmorillonite with the formation of a polyethylene nanocomposite. The enhanced mechanical properties were explained as a consequence of the reinforcement due to the presence of nanoscale layers formed from exfoliation of the clay included in the polyethylene matrix. V

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## Abstract Linear low‐density polyethylene (LLDPE) was prepared by __in situ__ copolymerization of ethylene with dual‐functional catalysts that were composed of __rac__‐Et(Ind)~2~ZrCl~2~ supported on montmorillonite (MMT) and {[(2‐ArNC(Me))~2~C~5~H~3~N]FeCl~2~} [Ar = 2,4‐C~6~H~4~(Me)~2~] oligomer