Self-Assembling Structure in Solution of a Semirigid Polyelectrolyte
We investigated the self-assembling structure in aqueous solution of polyelectrolyte poly(2,2‘-disulfonyl-4,4‘-benzidine terephthalamide) (PBDT), which has a rigid chemical structure of polyaramide in the main chain. It is found that PBDT exhibits a stretched semirigid conformation in solution, rega...
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Published in | Macromolecules Vol. 41; no. 5; pp. 1791 - 1799 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Washington, DC
American Chemical Society
11.03.2008
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Subjects | |
Online Access | Get full text |
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Summary: | We investigated the self-assembling structure in aqueous solution of polyelectrolyte poly(2,2‘-disulfonyl-4,4‘-benzidine terephthalamide) (PBDT), which has a rigid chemical structure of polyaramide in the main chain. It is found that PBDT exhibits a stretched semirigid conformation in solution, regardless of PBDT concentration, C P, or salt addition. PBDT in water exhibits both a very low overlap concentration, C*, and a lower critical concentration of nematic liquid crystal, C LC*. In the intermediate region of C* < C P < C LC*, PBDT forms cluster-like isotropic self-assembly. Moreover, in the intermediate region of C* < C P < C LC*, the addition of NaCl induces the alternation of structure from a cluster-like isotropic self-assembly to a fiber-like anisotropic one. Further addition of NaCl induces a network-like huge self-assembling structure, as the stoichiometric molar ratio of [NaCl] to [NaSO3 -] increases beyond 1. The semirigid polyelectrolyte probably has hidden potential for structural polymorphism in aqueous solutions in the presence of salt. |
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ISSN: | 0024-9297 1520-5835 |
DOI: | 10.1021/ma071251w |