Bis(Imino) Pyridyl Iron Complexes: the Effect of Polymerization Conditions on Activities and Thermal Behaviors of Polyethylene

سال انتشار: 1395
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 45

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شناسه ملی سند علمی:

JR_JPSTR-6-2_011

تاریخ نمایه سازی: 29 آذر 1402

چکیده مقاله:

Two late transition metal catalysts based on ۲,۶-bis(imino)pyridine iron(II) were synthesized by introducing methyl substitution (catalyst A) and t-Butyl substitution (catalyst B) at the ortho position of the aryl rings of the ligand. Comparative ethylene polymerizations using the catalysts showed quiet different behaviors. The activity of catalyst A was higher than that of catalyst B in all of the polymerization conditions used. The highest activities of these catalysts were obtained at almost ۲۵°C. Activities of the catalysts increased with increasing both monomer pressure and [Al]: [Fe] molar ratio. Multi modal peaks were appeared in the DSC analysis of oligomers obtained by catalyst A, while in the DSC analysis of the polymer obtained using catalyst B unimodal peaks were appeared. It is suggested that catalyst A containing less bulkier substitution produced polymer with different molecular weight fractions and different melting points. Besides, the t-butyl group in catalyst B resulted in producing polyethylene (PE) with single sharp DSC peaks; the latter is due to the formation of highly linear polyethylene. Polymerization temperatures affected the pattern of DSC thermograms in terms of number and shape of the peaks of the obtained polymers by catalyst A. Catalyst A produced linear oligomers contained liner olefinic part with a number average molecular weight in the range of ۲۶۰ to ۳۶۱.

نویسندگان

saeid ahmadjo

Iran Polymer and Petrochemical Institute

ali Ghotbi taheri

Ferdowsi University of Mashhad

Golam hossein Zohuri

Ferdowsi University of Mashhad

Saman Damavandi

Ferdowsi University of Mashhad

mohamad mortazavi

Iran Polymer and Petrochemical Institute

Samaneh Dehghani

Iran Polymer and Petrochemical Institute

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