Acta Phys. -Chim. Sin. ›› 1995, Vol. 11 ›› Issue (06): 541-546.doi: 10.3866/PKU.WHXB19950613
• ARTICLE •
Xiong Xing-Min,Yang Ju-Hua,Ye Mei-Ling,Zhang Ying-Jiu,Shi Liang-He
The positron lifetime technique has been used to study the temperature behavior of micelle in solution of polystyrene-polydimethylsiloxane diblock copolymer in n-heptane. The results indicate that positron annihilation parameters are found to be sensitive to structural and microphase changes taking place in the micellar solutions. The abrupt changes in the o-Ps lifetime and intensity observed at certain temperature appear to be associated with variations in the aggregation state of the copolymer molecules in solutions. Above the critical micelle temperature the o-Ps lifetime increases sharply with increasing temperature. This behavior indicates the process of disintegration of molecular aggregates to free copolymer molecules.
Positron annihilation;Blok copolymer;Micellar solution;Temperature effect
Xiong Xing-Min,Yang Ju-Hua,Ye Mei-Ling,Zhang Ying-Jiu,Shi Liang-He. Study of Temperature Effect of Micellar Solutions of PSDMS Block Copolymer in n-Heptane by Positron Annihilation[J].Acta Phys. -Chim. Sin., 1995, 11(06): 541-546.
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