Hydrophobically modified poly(4-vinyl pyridines) by alkyl bromides are kinds of polysoap similar to the surfactant. Properties of dilute solutions were studied through the viscosity measurements in pure water and NaCl...Hydrophobically modified poly(4-vinyl pyridines) by alkyl bromides are kinds of polysoap similar to the surfactant. Properties of dilute solutions were studied through the viscosity measurements in pure water and NaCl solutions. In aqueous solutions of polysoaps hydrophobic interaction can be attributed to aggregation of hydrophobic groups of the polysoap main chains. The hydrophobic groups of polysoap can aggregate to form hydrophobic microdomains (micelles) in aqueous solution. This is a compact conformation. The formation of such microdomains is a process of dynamic equilibrium.展开更多
Epichlorohydrin (ECH) and tetraethylenepentamine(TEPA) were copolymerized andthe copolymers were modified hydrophobically using a pendant C18 hydrophobic group (HPTE).Hydrophobic interaction of modified polymer was in...Epichlorohydrin (ECH) and tetraethylenepentamine(TEPA) were copolymerized andthe copolymers were modified hydrophobically using a pendant C18 hydrophobic group (HPTE).Hydrophobic interaction of modified polymer was investigated by fluorescence using pyrene as aprobe. It reveals that hydrophobic microdomains are formed by aggregation of hydrophobic sidechains. The water in hydrophobic microdomains is in a state of diffusion equilibrium under thehydrophobic interaction. Critical aggregate concentration (ccac) of HPTE decreases with increas-ing content of the bound hydrophobic groups.展开更多
A novel type of polysoap hydrogel based on poly(tetraethylenepentamine-epichlorohydrin)hydrophobically modified by stearic acid was prepared. The deswelling behaviors of polysoap hydrogels werestudied by immersing the...A novel type of polysoap hydrogel based on poly(tetraethylenepentamine-epichlorohydrin)hydrophobically modified by stearic acid was prepared. The deswelling behaviors of polysoap hydrogels werestudied by immersing the gels in buffer solution at various pHs and ionic species. The deswelling of the gelsdid not depend on the cationic species of electrolyte but depended strongly on the anionic species. Acomparison of polysoap gels with the gel unmodified hydrophobically verified the importance of hydrophobicinteraction, which enhances the occurrence of deswelling rate.展开更多
基金The project is financially supported by National Natural Science Foundation of China.
文摘Hydrophobically modified poly(4-vinyl pyridines) by alkyl bromides are kinds of polysoap similar to the surfactant. Properties of dilute solutions were studied through the viscosity measurements in pure water and NaCl solutions. In aqueous solutions of polysoaps hydrophobic interaction can be attributed to aggregation of hydrophobic groups of the polysoap main chains. The hydrophobic groups of polysoap can aggregate to form hydrophobic microdomains (micelles) in aqueous solution. This is a compact conformation. The formation of such microdomains is a process of dynamic equilibrium.
文摘Epichlorohydrin (ECH) and tetraethylenepentamine(TEPA) were copolymerized andthe copolymers were modified hydrophobically using a pendant C18 hydrophobic group (HPTE).Hydrophobic interaction of modified polymer was investigated by fluorescence using pyrene as aprobe. It reveals that hydrophobic microdomains are formed by aggregation of hydrophobic sidechains. The water in hydrophobic microdomains is in a state of diffusion equilibrium under thehydrophobic interaction. Critical aggregate concentration (ccac) of HPTE decreases with increas-ing content of the bound hydrophobic groups.
基金This work is financially supported by National Natural Science Foundation of China.
文摘A novel type of polysoap hydrogel based on poly(tetraethylenepentamine-epichlorohydrin)hydrophobically modified by stearic acid was prepared. The deswelling behaviors of polysoap hydrogels werestudied by immersing the gels in buffer solution at various pHs and ionic species. The deswelling of the gelsdid not depend on the cationic species of electrolyte but depended strongly on the anionic species. Acomparison of polysoap gels with the gel unmodified hydrophobically verified the importance of hydrophobicinteraction, which enhances the occurrence of deswelling rate.
