The Temperature Effect on Micellar Formation in the Amphiphilic Block Copolymer Solution

Abstract

Abstract: Aseries of poly (ethylene oxide) and poly(propylene oxide) block copolymers with amphiphilic structure have been synthesized in this paper.Both fluorescence probe and differential scanning calorimetric methods (DSC) were used to determine the critical micellar formation temperature(CMT) of these copolymers dissolved in water solution.It was found that the diblock copolymer (PEO-PPO) has almost the same properties as triblock (PEO-PPO-PEO) copolymer for which the CMTvalue decreases with the increasing of the length of hydrophobic segment in the molecule of copolymers.But, for another kind of triblock copolymer (PPO-PEO-PPO), its properties are completely different.It is probably due to the fact that the hydrophobic moieties are located at the terminal part of copolymeric chain which causes the solution to form a crosslinking network structure.In addition, by using of the peak wavelength shift phenomenon in fluorescence spectrum of probe compound which was dissolved in solvents with different polarities, the polarity and the degree of organization of internal nuclei in micelle can be evaluated.

Key words: Amphiphilic block copolymer, Fluorescence probe, Critical micellar temperature, Differential scanning calorimetry

TrendMD:

ZHANG Xiao-Hong, HUANG Peng-Cheng, WANG Peng-Fei, WU Shi-Kang. The Temperature Effect on Micellar Formation in the Amphiphilic Block Copolymer Solution[J]. Chem. J. Chinese Universities, 1997, 18(2): 303.

References

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