The content of CPT and VCS-LT could be improved to 4.88%, 21.52%, respectively from 0.379%, 1.524% in crude extract solution after refined by X-5 resin. Then the refined solution was chromatographically separated with...The content of CPT and VCS-LT could be improved to 4.88%, 21.52%, respectively from 0.379%, 1.524% in crude extract solution after refined by X-5 resin. Then the refined solution was chromatographically separated with hypercrosslinked resin and the contents of VCS-LT could be improved to about 60%(CPT 15%). The achromaticity needle crystal was obtained after several recrystallization and its structure was confirmed by IR, 1H NMR, 13C NMR, MS and element analysis.展开更多
The self assemble behavior of amphiphilic poly(styrene b acrylic acid), P(S b AA), in selective solvents was studied by dynamic light scattering(DLS). The diameters of micellae were found to be decreased and then incr...The self assemble behavior of amphiphilic poly(styrene b acrylic acid), P(S b AA), in selective solvents was studied by dynamic light scattering(DLS). The diameters of micellae were found to be decreased and then increased with the increase in the concentration of the calcium ion in solvent. The average diameter of micellae was minimum when the concentration of the CaCl 2 was 0 2 g/L . In addition, the distribution of micellae became narrow with the increase in the ethylenediamine concentration.展开更多
The micelles behavior of amphiphilic block copolymer P（Styrene\|b\|acrylic acid）, in aqueous solvent was studied by dynamic light scattering and TEM techniques. The diameters of micelle decreased and then increased ...The micelles behavior of amphiphilic block copolymer P（Styrene\|b\|acrylic acid）, in aqueous solvent was studied by dynamic light scattering and TEM techniques. The diameters of micelle decreased and then increased with the decrease of the pH of the solution, and the similar phenomenon was also detected with the increase of the concentration of the calcium ion. Without added acid, the micelles were small spheres of low polydispersity with an average diameter 48 nm. When the value of pH was less than 2, the micelles were unstable. It was found that the Ca\+\{2+\} was linked with the carboxyl in the same micelle when the concentration of the CaCl\-2 was less than 0\^2 mg/mL. The diameter of micelle was smaller than the one without Ca\+\{2+\}. The Ca\+\{2+\} was linked with the carboxyl between the different micelles when the concentration of the CaCl\-2 was more than 0\^5 mg/mL and the micelle was unstable. The diameters of micelles（from 37 nm to 100 nm） can be controlled by adding an appropriate concentration of CaCl\-2 between 0\^2\0\^5 mg/mL.展开更多
文摘The content of CPT and VCS-LT could be improved to 4.88%, 21.52%, respectively from 0.379%, 1.524% in crude extract solution after refined by X-5 resin. Then the refined solution was chromatographically separated with hypercrosslinked resin and the contents of VCS-LT could be improved to about 60%(CPT 15%). The achromaticity needle crystal was obtained after several recrystallization and its structure was confirmed by IR, 1H NMR, 13C NMR, MS and element analysis.
文摘The self assemble behavior of amphiphilic poly(styrene b acrylic acid), P(S b AA), in selective solvents was studied by dynamic light scattering(DLS). The diameters of micellae were found to be decreased and then increased with the increase in the concentration of the calcium ion in solvent. The average diameter of micellae was minimum when the concentration of the CaCl 2 was 0 2 g/L . In addition, the distribution of micellae became narrow with the increase in the ethylenediamine concentration.
文摘The micelles behavior of amphiphilic block copolymer P（Styrene\|b\|acrylic acid）, in aqueous solvent was studied by dynamic light scattering and TEM techniques. The diameters of micelle decreased and then increased with the decrease of the pH of the solution, and the similar phenomenon was also detected with the increase of the concentration of the calcium ion. Without added acid, the micelles were small spheres of low polydispersity with an average diameter 48 nm. When the value of pH was less than 2, the micelles were unstable. It was found that the Ca\+\{2+\} was linked with the carboxyl in the same micelle when the concentration of the CaCl\-2 was less than 0\^2 mg/mL. The diameter of micelle was smaller than the one without Ca\+\{2+\}. The Ca\+\{2+\} was linked with the carboxyl between the different micelles when the concentration of the CaCl\-2 was more than 0\^5 mg/mL and the micelle was unstable. The diameters of micelles（from 37 nm to 100 nm） can be controlled by adding an appropriate concentration of CaCl\-2 between 0\^2\0\^5 mg/mL.
