New Journal of Chemistry, Volume (42), No (22), Year (2018-11) , Pages (18288-18296)

Title : ( Synthesis of poly-a-olefins- containing rare shortchain branches by dinuclear Ni-based catalysts )

Authors: M. Khoshsefat , A. Dechal , S. Ahmadjo , ُS. M. M. Mortazavi , Gholamhossein Zohuri , J. B. P. Soares ,

Citation: BibTeX | EndNote

Abstract

1-Hexene homopolymer samples produced by a series of mononuclear -MCn, n = 1–3- and rigid/flexible bridged dinuclear -BCn, n = 1–7- Ni-based catalysts were characterized by 13C NMR, DSC, and GPC-IR analyses. Mononuclear catalysts through normal insertion produced poly-1-hexene- with a high amount of butyl branches, while dinuclear catalysts were able to polymerize 1-hexene with a high level of rare branches -ethyl and propyl- due to the partial chain walking mechanism. Theoretical calculation was employed in order to study the dinuclear catalysts, which confirmed the presence of two stereoisomers via the broadening of MWD, a different mechanism of polymerization and short chain branch -SCB- curves. The effects of the cocatalyst type -DEAC, EASC and MMAO- and concentration, time and temperature along with the polymerization of higher a-olefins -1-octene and 1-decene- on the behavior of dinuclear catalyst BC2 and polymer properties were investigated. As a result, in addition to catalyst structure, the monomer length and polymerization temperature were the two factors controlling the stability of the stereoisomers due to agostic interaction and kinetic energy, respectively.

Keywords

, Poly--olefins-, 1-hexane homopolymer, Ni-catalyay, dinuclear catalyst
برای دانلود از شناسه و رمز عبور پرتال پویا استفاده کنید.

@article{paperid:1072002,
author = {M. Khoshsefat and A. Dechal and S. Ahmadjo and S. M. M. Mortazavi and Zohuri, Gholamhossein and J. B. P. Soares},
title = {Synthesis of poly-a-olefins- containing rare shortchain branches by dinuclear Ni-based catalysts},
journal = {New Journal of Chemistry},
year = {2018},
volume = {42},
number = {22},
month = {November},
issn = {1144-0546},
pages = {18288--18296},
numpages = {8},
keywords = {Poly--olefins-; 1-hexane homopolymer; Ni-catalyay; dinuclear catalyst},
}

[Download]

%0 Journal Article
%T Synthesis of poly-a-olefins- containing rare shortchain branches by dinuclear Ni-based catalysts
%A M. Khoshsefat
%A A. Dechal
%A S. Ahmadjo
%A S. M. M. Mortazavi
%A Zohuri, Gholamhossein
%A J. B. P. Soares
%J New Journal of Chemistry
%@ 1144-0546
%D 2018

[Download]