A new copoly(ether ketone ketone)(NPEKK)has been synthesized from 4,5 bis(4 fluorobenzoyl) 1 methylcyclohexene, 4 (4 hydroxyphenyl) 2,3 phthalazin 1 one and 2,2 p hydroxyphenyl iso propane via nucleo\|philic polyconde...A new copoly(ether ketone ketone)(NPEKK)has been synthesized from 4,5 bis(4 fluorobenzoyl) 1 methylcyclohexene, 4 (4 hydroxyphenyl) 2,3 phthalazin 1 one and 2,2 p hydroxyphenyl iso propane via nucleo\|philic polycondensation reaction.The ring closing reaction of NPEKK with hydrazine gives the cyclizing product CNPEKK.The new polymers have been studied with FT IR,DSC and TGA.It has been proved that the synthesized poly(ether ketone ketone)s is very soluble in many organic solvents,thermal stable and have good tensile properties.While,CNPEKK is more stable,but less soluble.展开更多
A modified [3+1] cyclization procedure for the synthesis of calix [4]arenes was developed by using diglycol dimethyl ether as the solvent in place of dioxane which was generally adopted in previous literature. By the ...A modified [3+1] cyclization procedure for the synthesis of calix [4]arenes was developed by using diglycol dimethyl ether as the solvent in place of dioxane which was generally adopted in previous literature. By the modified procedure, the yield of 5-bromo-11, 23-di-tert-butyl-17-methyl-25, 26, 27, 28-tetrahydroxycalix[4]arene from cyclic condensation of 2, 6-bis(2’-hydroxy-5’-tert-butyl-benzyl)-4-cresol and 2, 6-bis (bromomethyl)-4-bromophenol in the presence of TiCl4 was improved from less than 20％ to 40％, and the reaction time was reduced from several days to ten hours.展开更多
文摘A new copoly(ether ketone ketone)(NPEKK)has been synthesized from 4,5 bis(4 fluorobenzoyl) 1 methylcyclohexene, 4 (4 hydroxyphenyl) 2,3 phthalazin 1 one and 2,2 p hydroxyphenyl iso propane via nucleo\|philic polycondensation reaction.The ring closing reaction of NPEKK with hydrazine gives the cyclizing product CNPEKK.The new polymers have been studied with FT IR,DSC and TGA.It has been proved that the synthesized poly(ether ketone ketone)s is very soluble in many organic solvents,thermal stable and have good tensile properties.While,CNPEKK is more stable,but less soluble.
文摘A modified [3+1] cyclization procedure for the synthesis of calix [4]arenes was developed by using diglycol dimethyl ether as the solvent in place of dioxane which was generally adopted in previous literature. By the modified procedure, the yield of 5-bromo-11, 23-di-tert-butyl-17-methyl-25, 26, 27, 28-tetrahydroxycalix[4]arene from cyclic condensation of 2, 6-bis(2’-hydroxy-5’-tert-butyl-benzyl)-4-cresol and 2, 6-bis (bromomethyl)-4-bromophenol in the presence of TiCl4 was improved from less than 20％ to 40％, and the reaction time was reduced from several days to ten hours.
