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Citation: 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 Physico-Chimica Sinica, ;1995, 11(06): 541-546. doi: 10.3866/PKU.WHXB19950613 shu

Study of Temperature Effect of Micellar Solutions of PSDMS Block Copolymer in n-Heptane by Positron Annihilation

1.
Institute of High Energy Physics,Academic Sinica,Beijing 100080

Received Date: 17 August 1994
Available Online: 15 June 1995

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
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