介质极性敏感膜的制备和性能研究

以交联壳聚糖膜为载体,芘为介质极性探针,制备并表征了一种介质极性敏感膜,研究了该膜对醇-水混合溶剂极性的响应行为.基于极性测定,对十二烷基硫酸钠(SDS)和十二烷基磺酸钠(SLS)水溶液中胶束的形成进行了检测.结果表明,该膜具有较好的可逆性和重现性,且制膜方法简单、快速.

Preparation and Properties of Medium Polarity Sensitive Membranes

A medium polarity sensitive membrane was prepared by embedding pyrene(Py), a polarity fluorescence probe, into a glutaraldehyde(Glu) crosslinked chitosan(CS) membrane. The composition and thermostability of the membrane were characterized by FTIR and TGA analysis. It is shown that the composition of the membrane is close to that of CS. The introduction of micro amount of Py and crosslinker has little effect upon the composition of the membrane. However, the Glu crosslinked CS membrane is more stable toward heating than the uncrosslinked CS membrane. In addition, the crosslinked CS membrane is also stable in acidic and basic media. The CS Glu membrane containing Py was successfully used to monitor the polarities of various solvents including water, ethanol, and ethanol water mixtures. Based upon the measurement of polarity, the prepared membrane was also used to monitor the micellar formation in SDS solution. Compared with the traditional solution fluorescence probing method, this new method is more simple and convenient, and can be recycled.