Association behaviors of dodecyltrimethylammonium bromide with double hydrophilic block co-polymer poly(ethylene glycol)-block-poly(glutamate sodium)
Langmuir, ISSN: 0743-7463, Vol: 28, Issue: 43, Page: 15134-15140
2012
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- 14Captures
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Article Description
The association behaviors of single-chain surfactant dodecyltrimethylammonium bromide (DTAB) with double hydrophilic block co-polymers poly(ethylene glycol)-b-poly(sodium glutamate) (PEG -PGlu or PEG-PGlu) were investigated using isothermal titration microcalorimetry, cryogenic transmission electron microscopy, circular dichroism, potential, and particle size measurements. The electrostatic interaction between DTAB and the oppositely charged carboxylate groups of PEG-PGlu induces the formation of super-amphiphiles, which further self-assemble into ordered aggregates. Dependent upon the charge ratios between DTAB and the glutamic acid residue of the co-polymer, the mixture solutions can change from transparent to opalescent without precipitation. Dependent upon the chain length of the PGlu block, the mixture of DTAB and PEG-PGlu diblocks can form two different aggregates at their corresponding electroneutral point. Spherical and rod-like aggregates are formed in the PEG-PGlu/DTAB mixture, while the vesicular aggregates are observed in the PEG-PGlu /DTAB mixture solution. Because the PEG-PGlu /DTAB super-amphiphile has more hydrophobic components than that of the PEG-PGlu/DTAB super-amphiphile, the former prefers forming the ordered aggregates with higher curvature, such as spherical and rod aggregates, but the latter prefers forming vesicular aggregates with lower curvature. © 2012 American Chemical Society.
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