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Bis‐β‐(diketonates) Zn(II) complexes substituted with thiophene: Electropolymerization, homogeneous and heterogeneous catalysis for ring opening polymerization of lactide
Author(s) -
González Darío M.,
Cruz Nicole B.,
Hernández Loreto A.,
Oyarce Jocelyn,
Benavente Rosario,
Manzur Carolina
Publication year - 2020
Publication title -
journal of polymer science
Language(s) - English
Resource type - Journals
eISSN - 2642-4169
pISSN - 2642-4150
DOI - 10.1002/pol.20190103
Subject(s) - polymerization , catalysis , dispersity , polymer chemistry , monomer , ring opening polymerization , chemistry , thiophene , reactivity (psychology) , propane , tacticity , homogeneous catalysis , homogeneous , zinc , materials science , organic chemistry , polymer , pathology , physics , thermodynamics , medicine , alternative medicine
Two Bis‐β‐diketonate zinc (II) complexes were synthesized using 1‐(thiophen‐2‐yl)butane‐1,3‐dione and 1‐(thiophen‐2‐yl)‐3‐(thiophen‐3‐yl)propane‐1,3‐dione as ligands. By electropolymerization of their thiophenyl groups, the metallopolymers deposited on FTO electrodes were obtained. The main objective was to study the reactivity of these compounds as ROP catalysts for PLA synthesis, using directly the zinc complexes (homogeneous catalysis) and also the modified electrodes with metallopolymers (heterogeneous catalysis). The homogeneous catalysis studies allowed the optimization of the polymerization conditions, such as reaction time, catalyst concentration, and the use of benzyl alcohol as cocatalyst, as well as their influence on the conversion rate, average molecular weight and polydispersity of PLA, using rac ‐LA and L‐LA as monomers. Also, the effect on tacticity and thermal properties were discussed. Finally, the ROP studies using immersed modified electrodes in the polymerization medium were carried out under optimized experimental conditions. These tests were positive for one of the studied compounds, reaching conversions of up to 67%. © 2020 Wiley Periodicals, Inc. J. Polym. Sci. 2020 , 58 , 557–567