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Association Behaviors of Dodecyltrimethylammonium Bromide With Double Hydrophilic Block Co-Polymer Poly(ethylene Glycol)-Block-Poly(glutamate Sodium)

Association Behaviors of Dodecyltrimethylammonium Bromide With Double Hydrophilic Block Co-Polymer Poly(ethylene Glycol)-Block-Poly(glutamate Sodium)

Yuchun Han, Lin Xia, Linyi Zhu, Shusheng Zhang, Zhibo Li, Yilin Wang

Langmuir. 2012 Oct 30;28(43):15134-40.

PMID: 23057580

Abstract:

The association behaviors of single-chain surfactant dodecyltrimethylammonium bromide (DTAB) with double hydrophilic block co-polymers poly(ethylene glycol)-b-poly(sodium glutamate) (PEG(113)-PGlu(50) or PEG(113)-PGlu(100)) were investigated using isothermal titration microcalorimetry, cryogenic transmission electron microscopy, circular dichroism, ζ 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(113)-PGlu(50)/DTAB mixture, while the vesicular aggregates are observed in the PEG(113)-PGlu(100)/DTAB mixture solution. Because the PEG(113)-PGlu(100)/DTAB super-amphiphile has more hydrophobic components than that of the PEG(113)-PGlu(50)/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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP1119944	Dodecyltrimethylammonium bromide		1119-94-4	Price

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