Polyolefins Journal
With the collaboration of Iran Polymer Society

Influence of diethyl zinc on ethylene-norbornene copolymerization

Document Type : Original research

Authors

Leticia Pereira
Maria Marques

Universidade Federal do Rio de Janeiro, Instituto de Macromoléculas Professora Eloisa Mano-IMA-UFRJ Av. Horácio Macedo, 2030, Centro de Tecnologia Bloco J. Cidade Universitária. Rio de Janeiro, RJ, Brazil

https://doi.org/10.22063/poj.2017.1512
Abstract
Ethylene-norbornene copolymers were synthesized with a homogeneous catalyst system based on bis(imino) pyridine iron with the addition of diethyl zinc (DEZ) as alkyd transfer agent to promote immortal copolymerization. The addition of DEZ did not influence the catalytic activity in copolymerization with 7.5 mmol of norbornene (NB), but in the reactions with 70 mmol, the comonomer promoted an increase of activity. We observed by thermal analysis that the norbornene inserted in the chains promoted an increase in thermal stability of the synthesized material with higher amounts of comonomer, since the temperature of initial degradation was much higher for these copolymers compared to polyethylene. In addition, for the copolymers with 7.5 mmol of norbornene, the DEZ served as alkyd transfer agent, as shown by the gel permeation chromatography analysis, leading to a decrease in both molar mass and polydispersity. The UV-Vis spectra showed that the diethyl zinc did not change the catalytically active center, but only acted as an alkyd transfer agent.

Keywords

Homogeneous catalyst
bis(imino)pyridine iron complex
ethylene-norbornene copolymerization
alkyd transfer agent
Subjects
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Polyolefins Journal
Volume 5, Issue 1
Winter 2018
Pages 71-84

  • Receive Date 27 July 2017
  • Revise Date 11 September 2017
  • Accept Date 16 September 2017
  • First Publish Date 01 January 2018

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