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S. Firlik, J. Stasiński, S. Pawłowski

Effect of catalytic system structure and conditions of oxidative polymerization of 2,6-dimethylphenol

on yield and molar mass of poly(phenylene oxide)

Polimery 2018, No 6, 409

DOI: dx.doi.org/10.14314/polimery.2018.6.1

Summary

The activities of catalytic systems CuX2/L [where: X= Br¯, Cl¯, L = dibutylamine, N,N-dimethylbutylamine (DBA), N-methylaminopropyltrimetoxysilane,morpholine] in the oxidative polymerization of 2,6-dimethylphenol (2,6-DMP) topoly(phenylene oxide) (PPO) were compared. The effects of 2,6-DMP/Cu molarratio (500—750) in the most active CuBr2/dibutylamine system and the composition of toluene/hexane mixture as reaction medium on the PPO yield and molar mass were investigated. The CuBr2/DBA system (molar ratio 2,6-DMP/Cu =250) allowed to obtain the highest yield (90.4%) of PPO with the highest molar mass (67 900 g/mol). It has been found that in the presence of CuBr2/DBA during a dozen or so minutes after completing monomer dosing, low molecular weight product (5000 g/mol) was produced, after one hour polymer with molar mass typical for commercial species (56 800 g/mol) was produced, and further extending of the time did not significantly affect the molar mass of the product. The introduction of additional amine (N,N-dimethylbutylamine or N,N’-di-t-butylethylenediamine) enabled PPO synthesis with high yield and molar mass typical for that of commercial polymerat lower dibutylamine to Cu molar excess. The use of solvent/non-solventmixture turned out to be ineffective in the synthesis of PPO.



Keywords: poly(phenylene oxide), poly(2,6-dimethyl-1,4-phenylene oxide), oxidative polymerization

e-mail: sebastian.firlik@ichp.pl

S. Firlik, J. Stasiński, S. Pawłowski (1.93 MB)
Effect of catalytic system structure and conditions of oxidative polymerization of 2,6-dimethylphenol on yield and molar mass of poly(phenylene oxide)