- 作者: Lie-Chuan Lue and Jeng-Shong Shih*
- 作者服務機構: Department of Chemistry, National Taiwan Normal University, Taipei, Taiwan 116, R.O.C.
- 中文摘要: Various crown ethers were prepared and applied as phase transfer catalysts for the anionic 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 anionic 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 oC 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.
- 英文摘要: --
- 中文關鍵字: Crown ethers; Phase transfer catalysts; Poly(bisphenol A / sulfone); Bisphenol A; Sulfone; Anionic polymerization.
- 英文關鍵字: Crown ethers; Phase transfer catalysts; Poly(bisphenol A / sulfone); Bisphenol A; Sulfone; Anionic polymerization.