effect of polymer concentration and length of hydrophobic end block on the unimer-micelle transition broadness in amphiphilic aba symmetric triblock copolymer solutions
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ID: 184107
2013
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Abstract
The effects of the length of each hydrophobic end block Nst and polymer concentration φP on the transition broadness in amphiphilic ABA symmetric triblock copolymer solutions are studied using the self-consistent field lattice model. When the system is cooled, micelles are observed, i.e.,the homogenous solution (unimer)-micelle transition occurs. When Nst is increased, at fixed φP, micelles occur at higher temperature, and the temperature-dependent range of micellar aggregation and half-width of specific heat peak for unimer-micelle transition increase monotonously. Compared with associative polymers, it is found that the magnitude of the transition broadness is determined by the ratio of hydrophobic to hydrophilic blocks, instead of chain length. When φP is decreased, given a large Nst, the temperature-dependent range of micellar aggregation and half-width of specific heat peak initially decease, and then remain nearly constant. It is shown that the transition broadness is concerned with the changes of the relative magnitudes of the eductions of nonstickers and solvents from micellar cores.
| Reference Key |
han2013condensedeffect
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|---|---|
| Authors | ;X.-G. Han;Y.-H. Ma;S.-L. Ouyang |
| Journal | conference on human factors in computing systems - proceedings |
| Year | 2013 |
| DOI |
10.5488/CMP.16.33601
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