天津大学学报(英文版)
天津大學學報(英文版)
천진대학학보(영문판)
Transactions of Tianjin University
2015年
5期
406-411
,共6页
郭锦棠%郁培云%王海霞%赵海洋
郭錦棠%鬱培雲%王海霞%趙海洋
곽금당%욱배운%왕해하%조해양
bipyridine%CO/styrene copolymerization%palladium(II)complex%polyketone
A series of 4,4'-disubstituted-[2,2']-bipyridines, featuring electron withdrawing/donating functional groups such as amino, chloro, nitro, ethoxycarbonyl, carboxy, methyl, methoxy and hydroxymethyl, have been syn-thesized and employed in the copolymerization of carbon monoxide(CO)and styrene. The available bipyridine and its derivatives were coordinated with palladium(Ⅱ)acetate for catalyzing the copolymerization of CO and styrene, and the concomitant polyketone was characterized by means of 13C NMR, FTIR, differential scanning calo-rimetry(DSC)and element analysis techniques concerning its structure and thermal performance. The effect of dif-ferent electron-donating and electron-withdrawing groups on catalyst performance and molecular weight of co-polymer was studied under certain experimental condition. It has been proved that the enhancement of electron donating and conjugative effects on bipyridine ligand will not only improve the catalytic activity of the composi-tion, but also increase the molecular weight of the as-prepared polyketone. The catalytic activity is the highest in hydroxymethyl substituted 2,2'-bipyridine ligand(1 356 gSTCO/(gPd · h)), when the molecular weight and polydispersity index of the polyketone are Mn=8 502,Mw=1 3440 and Mw/Mn=1.581, respectively.