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
By the use of ordering-tree and connectivity matrix,a new algorithm to code non-circlemolecules, called connectivity matrix polynomal (CMP) algorithm, is developed. The algorithmcan not only differentiate asymmetrical...By the use of ordering-tree and connectivity matrix,a new algorithm to code non-circlemolecules, called connectivity matrix polynomal (CMP) algorithm, is developed. The algorithmcan not only differentiate asymmetrical atoms. but also make the two-direction mapping betweencodes and non-circle molecular strnctures. That is, from the molecular structure, a nmque codecan be obtained, and from the nmque code, the specific molecular structure can be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By the use of ordering-tree and connectivity matrix,a new algorithm to code non-circlemolecules, called connectivity matrix polynomal (CMP) algorithm, is developed. The algorithmcan not only differentiate asymmetrical atoms. but also make the two-direction mapping betweencodes and non-circle molecular strnctures. That is, from the molecular structure, a nmque codecan be obtained, and from the nmque code, the specific molecular structure can be
