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
✍ Scribed by Zhiquan Shen; Xianhai Chen; Yifeng Zhang
- Publisher
- John Wiley and Sons
- Year
- 1994
- Tongue
- English
- Weight
- 358 KB
- Volume
- 195
- Category
- Article
- ISSN
- 1022-1352
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✦ Synopsis
Abstract
Copolymerization of carbon dioxide with epichlorohydrin to synthesize high molecular weight chlorine‐containing poly(carbonate‐ether) with RE(P~204~)~3~Al[CH~2~CH(CH~3~)~2~]~3~ (with RE = La, Eu, Gd, Dy, Ho, Nd, Er, Yb, Lu, Y; P~204~ = (RO)~2~POO, R = CH~3~(CH~2~)~3~CH(C~2~H~5~)CH~2~) as a catalyst was carried out for the first time. The most favorable conditions for the copolymerization were: CO~2~ aged Y(P~204~)~3~Al[CH~2~CH(CH~3~)~2~]~3~ as catalyst; mole ratio Al/Y = 8; reaction time 24 h; temperature 60–70°C; concentration [Y] = 3,31 · 10^−2^ mol/L; 1,4‐dioxane as solvent. The highest yield, intrinsic viscosity [η] and CO~2~ content of the copolymer obtained reached 3 945 g per mole of rare earth element, [η] = 1,49 dL/g and f(CO~2~) = 30 mol‐%, respectively. Results from differential thermal analysis/thermogravimetry showed that the copolymer has high thermal stability and decomposes at 320°C.