The critical micelle concentration(CMC) value and surface charge of the amphiphilic graft copolymer PECA-g-PEG micelles(PECA:polyethyl cyanoacrylae, PEG:polyethylene glycol) are reported. CMC of the copolymers is dete...The critical micelle concentration(CMC) value and surface charge of the amphiphilic graft copolymer PECA-g-PEG micelles(PECA:polyethyl cyanoacrylae, PEG:polyethylene glycol) are reported. CMC of the copolymers is determined from the absorbance change of bromophenol blue solution as function of copolymer concentration, which is about 1×10 -6 mol/L. The critical coagulation concentration (cz c) of electrolytes with different valence(z) for the copolymer micelles are examined by visual method and compared with that obtained by experiential formula cz c∝z -6. The relation formula for different cations is deduced:cz c∝z -4, which indicates the electronegative character of the micelle surface.展开更多
Both critical micelle concentration(CMC)and the counter-ion association degree (K) of aqueous cationic surfactants solutions (DTMAC,DTAC,TTAC,CTAC,OTAC)could be determined simultaneously by chloride ISE.The experiment...Both critical micelle concentration(CMC)and the counter-ion association degree (K) of aqueous cationic surfactants solutions (DTMAC,DTAC,TTAC,CTAC,OTAC)could be determined simultaneously by chloride ISE.The experimental results showed that the CMC were in agreement with the literature value.ISE was both simple and quick,and the results were accurate,reliable and satisfied.The reasons for the differences between the results obtained from both ISE and conductance methods were also discussed in detail in this paper.展开更多
文摘The critical micelle concentration(CMC) value and surface charge of the amphiphilic graft copolymer PECA-g-PEG micelles(PECA:polyethyl cyanoacrylae, PEG:polyethylene glycol) are reported. CMC of the copolymers is determined from the absorbance change of bromophenol blue solution as function of copolymer concentration, which is about 1×10 -6 mol/L. The critical coagulation concentration (cz c) of electrolytes with different valence(z) for the copolymer micelles are examined by visual method and compared with that obtained by experiential formula cz c∝z -6. The relation formula for different cations is deduced:cz c∝z -4, which indicates the electronegative character of the micelle surface.
文摘Both critical micelle concentration(CMC)and the counter-ion association degree (K) of aqueous cationic surfactants solutions (DTMAC,DTAC,TTAC,CTAC,OTAC)could be determined simultaneously by chloride ISE.The experimental results showed that the CMC were in agreement with the literature value.ISE was both simple and quick,and the results were accurate,reliable and satisfied.The reasons for the differences between the results obtained from both ISE and conductance methods were also discussed in detail in this paper.
