The ligand N,N-bis(2,6-dibenzhydryl-4-ethoxy phenyl)butane-2,3-diimine via a multi-step reaction and the correspond palladium(II) a-diimine catalyst were synthesized, characterized and used in polymerization of ethylene. The effects of polymerization condition were investigated which the a-diimine catalyst was active up to 80 ºC. The highest activity of the catalyst (330 kg of PE (mol Pd -1 h-1) was obtained at 2 equivalent NaBAF (cocatalyst), Tp=40 ºC and P= 5 bar. GPC analysis revealed that the Mw of polyethylene virtually was equal to 8.1x 104 g/mol along with PDI = 1.83. The structure of complex was optimized and the theoretical parameters were presented. The synthesized PE/MWCNT nanocomposite via in-situ polymerization showed the higher thermal stability (27 ºC in presence of 3.88% MWCNT) than neat PE. Investigation of samples morphology by SEM, showed the morphology of the catalyst and PE were virtually spherical according to replication phenomenon and the MWCNTs acted as a bridge and end-cap in the polymer matrix.

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