Język Polski
English
Published
: 2021-01-13
Effect of catalytic system structure and conditions of oxidative polymerization of 2,6-dimethylphenol on yield and molar mass of poly(phenylene oxide)
Abstract
The activities of catalytic systems CuX2/L [where: X = Brˉ, Clˉ, L = dibutylamine, N,N-dimethylbutylamine (DBA), N-methylaminopropyltrimetoxysilane, morpholine] in the oxidative polymerization of 2,6-dimethylphenol (2,6-DMP) to poly(phenylene oxide) (PPO) were compared. The effects of 2,6-DMP/Cu molar ratio (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 polymer at lower dibutylamine to Cu molar excess. The use of solvent/non-solvent mixture turned out to be ineffective in the synthesis of PPO.
Details
Statistics
Authors
Zasady cytowania
Firlik, S., Stasiński, J., & Pawłowski, S. (2021). Effect of catalytic system structure and conditions of oxidative polymerization of 2,6-dimethylphenol on yield and molar mass of poly(phenylene oxide). Polimery, 63(6), 409-415. https://doi.org/10.14314/polimery.2018.6.1
