New catalytic systems for the fixation of carbon dioxide, 2.Synthesis of high molecular weight epichlorohydrin/carbon dioxide copolymer with rare earth phosphonates/triisobutyl‐aluminium systems

摘要

AbstractCopolymerization of carbon dioxide with epichlorohydrin to synthesize high molecular weight chlorine‐containing poly(carbonate‐ether) withRE(P204)3AlCH2CH(CH3)23(withRE= La, Eu, Gd, Dy, Ho, Nd, Er, Yb, Lu, Y;P204= (RO)2POO, R = CH3(CH2)3CH(C2H5)CH2) as a catalyst was carried out for the first time. The most favorable conditions for the copolymerization were: CO2aged Y(P204)3AlCH2CH(CH3)23as catalyst; mole ratio Al/Y = 8; reaction time 24 h; temperature 60–70°C; concentration Y = 3,31 · 10−2mol/L; 1,4‐dioxane as solvent. The highest yield, intrinsic viscosity η and CO2content of the copolymer obtained reached 3 945 g per mole of rare earth element, η = 1,49 dL/g andf(CO2) = 30 mol‐, respectively. Results from differential thermal analysis/thermogravimetry showed that the copolymer has high thermal stability