Novel physically cross-linked hydrogels, composed of PVA and hydroxy-terminated polyamidoamine(PAMAM) dendrimer G6-OH, were prepared by cyclic freezing/thawing treatment of aqueous solutions containing PVA and G6-OH. ...Novel physically cross-linked hydrogels, composed of PVA and hydroxy-terminated polyamidoamine(PAMAM) dendrimer G6-OH, were prepared by cyclic freezing/thawing treatment of aqueous solutions containing PVA and G6-OH. FTIR analysis indicates that PAMAM dendrimer G6-OH was successfully introduced into PVA hydrogels. Higher contents of G6-OH in PVA/G6-OH hydrogels resulted in higher swelling ratios, and faster reswelling rates. With the increase of freezing/thawing cyclic times, the swelling ratios and reswelling rates of PVA/G6-OH hydrogels decreased, which is similar to that of physically cross-linked PVA hydrogel.展开更多
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Novel physically cross-linked hydrogels, composed of PVA and hydroxy-terminated polyamidoamine(PAMAM) dendrimer G6-OH, were prepared by cyclic freezing/thawing treatment of aqueous solutions containing PVA and G6-OH. FTIR analysis indicates that PAMAM dendrimer G6-OH was successfully introduced into PVA hydrogels. Higher contents of G6-OH in PVA/G6-OH hydrogels resulted in higher swelling ratios, and faster reswelling rates. With the increase of freezing/thawing cyclic times, the swelling ratios and reswelling rates of PVA/G6-OH hydrogels decreased, which is similar to that of physically cross-linked PVA hydrogel.
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.
