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- W2016112439 abstract "Various crown ethers were prepared and applied as phase transfer catalysts for the an ionic copolymerization of bisphenol A and 4,4′-dichlorodiphenyl sulfone monomers with alkali salts, e.g., NaNH2, NaOH and KOH, as initiators. The catalytic abilities of various crown ethers for the an ionic polymerization of bisphenol A / 4,4′-dichlorodiphenyl sulfone were found to be in the order: 15-crown-5 ≅ monobenzo-15-crown-5 > 18-crown-6 > Dicyclohexano-18-crown-6 > Dibenzo-18-crown-6 > 12-crown-4 with sodium amide (NaNH2) as initiator. Sodium amide was shown to be a better initiator than NaOH or KOH with monobenzo- 15-crown-5 as a catalyst. Effects of solvents and temperature on the crown ether catalytic polymerization were also investigated. Dimethyl sulfoxide (DMSO) exhibited much better for the polymerization than other organic solvents, e.g., toluene, p-xylene, dimethyl formamide and dioxane. Higher polymerization was found at higher temperatures and about 100% yield of poly(bisphenol A / sulfone) was obtained at 125 °C in 3 hr. The molecular weight of poly(bisphenol A / sulfone) as a function of reaction time was determined with gel permeation chromatography. Concentration effects of crown ether on % yield and molecular weight of poly(bisphenol A / sulfone) were also investigated and discussed." @default.
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- W2016112439 title "Crown Ether Phase Transfer Catalysts for An Ionic Polymerization of Bisphenol A / 4,4′-Dichlorodiphenyl Sulfone" @default.
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- W2016112439 doi "https://doi.org/10.1002/jccs.200200012" @default.
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