The complexation between poly(amidoamine) (PAMAM) dendrimers and silver ion was studied in this paper. The results showed that generations and surface groups of dendrimers, reaction time, pH value, mole ratio of Ag+ /...The complexation between poly(amidoamine) (PAMAM) dendrimers and silver ion was studied in this paper. The results showed that generations and surface groups of dendrimers, reaction time, pH value, mole ratio of Ag+ /PAMAM dendrimers, as well as reaction temperature strongly influence complexation between Ag+ and PAMAM dendrimers. The maximum complexing number of Ag+ that amino , hydroxyl and carboxylate terminated PAMAM dendrimers could bind has been obtained. It has been found that the measured value of amino and hydroxyl terminated PAMAM is almost similar to the theory value, but to carboxylate terminated PAMAM, there is a discrepancy between the measured value and theory value because of the electrostatic interaction between the silver ion and carboxyl group.展开更多
文摘The complexation between poly(amidoamine) (PAMAM) dendrimers and silver ion was studied in this paper. The results showed that generations and surface groups of dendrimers, reaction time, pH value, mole ratio of Ag+ /PAMAM dendrimers, as well as reaction temperature strongly influence complexation between Ag+ and PAMAM dendrimers. The maximum complexing number of Ag+ that amino , hydroxyl and carboxylate terminated PAMAM dendrimers could bind has been obtained. It has been found that the measured value of amino and hydroxyl terminated PAMAM is almost similar to the theory value, but to carboxylate terminated PAMAM, there is a discrepancy between the measured value and theory value because of the electrostatic interaction between the silver ion and carboxyl group.
文摘以丙烯酰胺(AM)、对苯乙烯磺酸钠(SSS)和烯丙基聚乙二醇(APEG)为单体,经水溶液聚合法合成了具有不同侧链长度的新型聚酰胺梳形高分子分散剂(PAM-700,1 000,1 200,2400),采用红外、凝胶色谱、热重和差热法表征了分散剂结构和热稳定性;以水煤浆粘度仪、析水率法研究了不同侧链长度聚酰胺分散剂对神府煤浆的分散、稳定性能;使用视频润湿角仪和zeta电位仪研究了分散剂在煤面的润湿性能和水煤浆zeta电位.结果表明,PAM-1000分散效果最好,其分子量Mw为3.32×104~,对神府煤制65%水煤浆,当其用量在0.35%时降粘效果最佳,其粘度为417 m Pa·s,7天析水率2.88%,比萘磺酸盐有更好的分散稳定性.
