以芘(Py)为荧光探针,十六烷基氯化吡啶(CPC)为猝灭剂,用稳态荧光猝灭法研究十二烷基硫酸钠(SDS)浓度和溶液极性对其胶束聚集数的影响.结果表明,当SDS浓度在5～42倍cmc时,胶束聚集数Nagg随SDS的浓度增大而增大,并且趋势逐渐变缓.当SDS浓度为11.3倍cmc时,胶束聚集数随NaCl浓度增大而明显增大,I1/I3值逐渐减小.以上两种条件下聚集数的增大引起疏水微嵌段长度较大的变化,而微嵌段长度又是胶束聚合中最重要的参数之一.因此,胶束聚合合成微嵌段缔合聚合物中,SDS浓度和溶液极性对其胶束聚集数的影响不能忽略.%The micellar aggregation numbers of SDS with different concentrations of SDS or polarity were determined by steady-state fluorescence quenching method in which pyrene was used as a fluorescence probe and cetylpyridinium chloride as a quencher. The results showed that /Vagg increased with increasing the SDS concentration in a range of 5 -42 times cmc and the increased value became more and more slowly. When the concentration of SDS was 11.3 times cmc,the ./Vagg increased significantly with increasing the NaCl concentration and /,//3 decreased gradually. Under these two conditions, the increase numbers of aggregation caused a great change in hydrophobe micro-block length, and the micro-block length was one of the most important parameter in micellar polymerization. Therefore,in the synthesis of the micro-block' associative polymers by micellar polymerization, the effect of concentrations of SDS or polarity on micellar aggregation numbers can not be ignored.
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