Teroolymerization of enichlorohydrin（ECH）-maleic anhydride（MAn）-carbon dioxide（CO;） was carried out by using Y(P;);-Al（i-Bu）;as catalyst for the first time.The terpolymersobtained were characterized by IR and;...Teroolymerization of enichlorohydrin（ECH）-maleic anhydride（MAn）-carbon dioxide（CO;） was carried out by using Y(P;);-Al（i-Bu）;as catalyst for the first time.The terpolymersobtained were characterized by IR and;H-NMR.It was foundthat the composition of the teroolymer was influenced by theaddition mode,initial monomer charge ratio,etc.展开更多
The catalytic effectsof Ln3+ on synthesis of polyethyleneterephthalate and its copolyesterswere studied. The direct esterification reaction of terephthalate acidwith ethylene glycol can be accelerated hy addition of L...The catalytic effectsof Ln3+ on synthesis of polyethyleneterephthalate and its copolyesterswere studied. The direct esterification reaction of terephthalate acidwith ethylene glycol can be accelerated hy addition of Ln3+, and theLn3+, compound can be acted aspromoter of Sb2O3 in the stage ofpolycondensation. The mechanismof esterification and polycondensation by addition of Ln3+ was discussed. The thermal-stabilities ofpolyethylene terephthalate and itscopolyesters obtained by addihon ofLn3+ were also investigaed.展开更多
文摘Teroolymerization of enichlorohydrin（ECH）-maleic anhydride（MAn）-carbon dioxide（CO;） was carried out by using Y(P;);-Al（i-Bu）;as catalyst for the first time.The terpolymersobtained were characterized by IR and;H-NMR.It was foundthat the composition of the teroolymer was influenced by theaddition mode,initial monomer charge ratio,etc.
文摘The catalytic effectsof Ln3+ on synthesis of polyethyleneterephthalate and its copolyesterswere studied. The direct esterification reaction of terephthalate acidwith ethylene glycol can be accelerated hy addition of Ln3+, and theLn3+, compound can be acted aspromoter of Sb2O3 in the stage ofpolycondensation. The mechanismof esterification and polycondensation by addition of Ln3+ was discussed. The thermal-stabilities ofpolyethylene terephthalate and itscopolyesters obtained by addihon ofLn3+ were also investigaed.
