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A comparative study of chain dynamics of di- and tri-block copolymers in semidilute solution in a non-selective solvent
Li, W; Hong, LZ; Ngai, T; Huang, HY; He, TB; Wu, C
2004-12-01
Source PublicationCHINESE JOURNAL OF POLYMER SCIENCE
ISSN0256-7679
Volume22Issue:6Pages:589-598
AbstractThe chain dynamics of a pair of diblock poly(styrene-b-butadiene) (PS210-b-PB960) and triblock poly(styrene-b-butadiene-b-styrene) (PS200-b-PB1815-b-PS200) copolymers in both dilute and semidilute toluene solutions has been comparatively studied by dynamic laser light scattering. As expected, the mutual diffusion of individual chain changes into a fast cooperative diffusion of the chain segments ("blobs") between two neighboring entanglement points for both the copolymers as the solution changes from dilute to semidilute. Further increases of the concentration lead to a second slow relaxation mode. For the triblock chains, there exists an additional middle relaxation between the fast and the slow modes. The concentration (c) dependent study of the average characteristic decay time of the fast mode ((tau(f))) reveals that 1/(tau(f)) - c(-a) with 0.33 < alpha < 0.44, much smaller than 0.75 predicted or 0.72 observed for linear homopolymer chains in good solvent. It implies that the solvent quality of toluene for PB might not be as good as that for PS. Due to such a difference in solubility, it is reasonable to speculate that the PB and PS blocks are transiently segregated in semidilute solution. The relaxation of these transient PB and PS richer domains leads to the observed slow relaxation. Such a speculation is supported by the appearance of an additional slow relaxation mode in the study of polyisoprene-b-polystyrene-b-polyisoprene in semidilute solution in cyclohexane, a non-selective solvent, in which we alternated the solubility difference by a variation of the solution temperature.
KeywordSemidilute Solutions Chain Dynamics Block Copolymers
Indexed BySCI
Language英语
WOS IDWOS:000225897700014
PublisherSPRINGER HEIDELBERG
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Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/81964
Collection中国科学院化学研究所
Corresponding AuthorWu, C
Affiliation1.Chinese Univ Hong Kong, Dept Chem, Shatin, Hong Kong, Peoples R China
2.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 13002, Peoples R China
3.Univ Sci & Technol China, Dept Chem Phys, Open Lab Bond Select Chem, Hefei 230026, Peoples R China
Recommended Citation
GB/T 7714
Li, W,Hong, LZ,Ngai, T,et al. A comparative study of chain dynamics of di- and tri-block copolymers in semidilute solution in a non-selective solvent[J]. CHINESE JOURNAL OF POLYMER SCIENCE,2004,22(6):589-598.
APA Li, W,Hong, LZ,Ngai, T,Huang, HY,He, TB,&Wu, C.(2004).A comparative study of chain dynamics of di- and tri-block copolymers in semidilute solution in a non-selective solvent.CHINESE JOURNAL OF POLYMER SCIENCE,22(6),589-598.
MLA Li, W,et al."A comparative study of chain dynamics of di- and tri-block copolymers in semidilute solution in a non-selective solvent".CHINESE JOURNAL OF POLYMER SCIENCE 22.6(2004):589-598.
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