Polymeric micelles with carboxyl groups in the core(PMCC)were prepared by chemical cross-linking induced micellization of chlorinated polystyrene-b-poly(acrylic acid)(PS-b-PAA)by glycol in dichloromethane.The crosslin...Polymeric micelles with carboxyl groups in the core(PMCC)were prepared by chemical cross-linking induced micellization of chlorinated polystyrene-b-poly(acrylic acid)(PS-b-PAA)by glycol in dichloromethane.The crosslinking of chlorinated PAA blocks results in the formation of micelle core,whereas PS block chains form the micelle shell.The chlorination of PAA produces anhydride groups,which make carboxyl groups during the crosslinking reaction with glycols,hence the resultant micelles contain carboxyl groups in the core.As the concentration of polymers can be as high as 50 g/mL,therefore,PMCC can be prepared with a high efficiency,and the powder micelle product was obtained by direct precipitation in methanol-water mixture.The PMCC were characterized by means of FTIR,1H NMR,DLS and SEM.展开更多
（2-acrylamido） ethyl tetradecyl dimethylammonium bromide （AMC14AB） was polymerized in aqueous solu- tion to form the homopolymer P（AMC14AB）. The physicochemical properties of P（AMC14AB） in aqueous solution wer...（2-acrylamido） ethyl tetradecyl dimethylammonium bromide （AMC14AB） was polymerized in aqueous solu- tion to form the homopolymer P（AMC14AB）. The physicochemical properties of P（AMC14AB） in aqueous solution were mainly studied with fluorescent probe method, surface tension measurement and conductom- etry. The experimental results show that the aggregation morphology of P（AMC14AB） in aqueous solution is unimolecular micelle as expected. Being different from conventional multimolecular micelle systems, the unimolecular micelle system of P（AMC14AB） not only shows critical micellar concentration （CMC=0）, （i.e. once added to pure water, the surface tension decreases immediately in spite how small the density is）, but also the surface tension stays almost the same with the concentration increasing. That is to say, there is no mutational point on the relationship curve between surface tension and concentration. Furthermore, the unimolecular micelle system of P（AMC14AB） has no Krafft temperature, i.e. at any temperature, so long as it is dissolved in water, the unimolecular micelles will form. Besides this, for the solubilization of hydrophobic organic substances, the unimolecular micelle system of P（AMC14AB） is obviously different from the common multimolecular micelle system, having no turning point on the relationship curve between toluene solubi- lizaion amount and P（AMC14AB） concentration, and the solubilizing ability of the unimolecular-micelle system of P（AMC14AB） for hydrophobic organic substances is much higher than that of the conventional multimolecular micelle solutions of common surfactants, such as centyl trimethyl ammonium bromide.展开更多
1 INTRODUCTIONMicroemulsion and micelle systems are wide-spread in the industry and agriculture applications,e.g.the petroleum exploitation,food industry chemical engineering and biological engineering,but so far,thei...1 INTRODUCTIONMicroemulsion and micelle systems are wide-spread in the industry and agriculture applications,e.g.the petroleum exploitation,food industry chemical engineering and biological engineering,but so far,their properties are still not very well understood.Both micelle and microemulsion systems are dispersed systems and consist of the aggregationsof the surfactant.The difference between them is that there is dispered liquid phase in the coreof the aggregation in the case of the microemulsion,but in the micelle there is not any展开更多
文摘Polymeric micelles with carboxyl groups in the core(PMCC)were prepared by chemical cross-linking induced micellization of chlorinated polystyrene-b-poly(acrylic acid)(PS-b-PAA)by glycol in dichloromethane.The crosslinking of chlorinated PAA blocks results in the formation of micelle core,whereas PS block chains form the micelle shell.The chlorination of PAA produces anhydride groups,which make carboxyl groups during the crosslinking reaction with glycols,hence the resultant micelles contain carboxyl groups in the core.As the concentration of polymers can be as high as 50 g/mL,therefore,PMCC can be prepared with a high efficiency,and the powder micelle product was obtained by direct precipitation in methanol-water mixture.The PMCC were characterized by means of FTIR,1H NMR,DLS and SEM.
文摘（2-acrylamido） ethyl tetradecyl dimethylammonium bromide （AMC14AB） was polymerized in aqueous solu- tion to form the homopolymer P（AMC14AB）. The physicochemical properties of P（AMC14AB） in aqueous solution were mainly studied with fluorescent probe method, surface tension measurement and conductom- etry. The experimental results show that the aggregation morphology of P（AMC14AB） in aqueous solution is unimolecular micelle as expected. Being different from conventional multimolecular micelle systems, the unimolecular micelle system of P（AMC14AB） not only shows critical micellar concentration （CMC=0）, （i.e. once added to pure water, the surface tension decreases immediately in spite how small the density is）, but also the surface tension stays almost the same with the concentration increasing. That is to say, there is no mutational point on the relationship curve between surface tension and concentration. Furthermore, the unimolecular micelle system of P（AMC14AB） has no Krafft temperature, i.e. at any temperature, so long as it is dissolved in water, the unimolecular micelles will form. Besides this, for the solubilization of hydrophobic organic substances, the unimolecular micelle system of P（AMC14AB） is obviously different from the common multimolecular micelle system, having no turning point on the relationship curve between toluene solubi- lizaion amount and P（AMC14AB） concentration, and the solubilizing ability of the unimolecular-micelle system of P（AMC14AB） for hydrophobic organic substances is much higher than that of the conventional multimolecular micelle solutions of common surfactants, such as centyl trimethyl ammonium bromide.
基金Supported by the National Nature Science Foundation of China(No.29736170).
文摘1 INTRODUCTIONMicroemulsion and micelle systems are wide-spread in the industry and agriculture applications,e.g.the petroleum exploitation,food industry chemical engineering and biological engineering,but so far,their properties are still not very well understood.Both micelle and microemulsion systems are dispersed systems and consist of the aggregationsof the surfactant.The difference between them is that there is dispered liquid phase in the coreof the aggregation in the case of the microemulsion,but in the micelle there is not any
