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Paper
Title

Influence of diethyl zinc on ethylene-norbornene copolymerization

Year: 1396
COI: JR_POJ-5-1_007
Language: EnglishView: 171
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Authors

Leticia Quinello Pereira - Universidade Federal do Rio de Janeiro, Instituto de Macromoléculas Professora Eloisa Mano-IMA-UFRJ
Maria de Fátima Vieira Marques - Av. Horácio Macedo, ۲۰۳۰, Centro de Tecnologia Bloco J. Cidade Universitária. Rio de Janeiro, RJ, Brazil

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. Polyolefins J (2018) 5: 71-84

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This Paper COI Code is JR_POJ-5-1_007. Also You can use the following address to link to this article. This link is permanent and is used as an article registration confirmation in the Civilica reference:

https://civilica.com/doc/722755/

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Quinello Pereira, Leticia and de Fátima Vieira Marques, Maria,1396,Influence of diethyl zinc on ethylene-norbornene copolymerization,https://civilica.com/doc/722755

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