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Complexation between sodium dodecyl sulfate and amphoteric polyurethane nanoparticles.

Yong Qiao¹, Shifeng Zhang, Ouya Lin

¹School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China.

The Journal of Physical Chemistry. B

|September 7, 2007

Summary

The interaction between sodium dodecyl sulfate (SDS) and amphoteric polyurethane (APU) nanoparticles (NPs) shows three complexation stages. These stages are driven by electrostatic attraction and hydrophobic aggregation, forming stable ionomer complexes with excess SDS.

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Area of Science:

Materials Science
Polymer Chemistry
Nanotechnology

Background:

Amphiphilic polymers like amphoteric polyurethane (APU) self-assemble into nanoparticles (NPs).
Sodium dodecyl sulfate (SDS) is an anionic surfactant that can interact with cationic or amphoteric materials.

Purpose of the Study:

To investigate the complexation process between SDS and APU NPs.
To understand the influence of SDS concentration on APU NP stability and structure.
To elucidate the driving forces behind the complexation.

Main Methods:

Dynamic Light Scattering (DLS)
Pyrene fluorescent probing
Zeta-potential measurements
Transmission Electron Microscopy (TEM)

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Main Results:

Three distinct stages of complexation were observed with increasing SDS/APU ratio.
Precipitation occurred near stoichiometric SDS concentration at pH 2.
Excess SDS led to the dissociation of precipitate and formation of stable ionomer complexes.
Pyrene I1/I3 variation confirmed the three stages and dependence on SDS/APU ratio.

Conclusions:

The complexation is governed by electrostatic attraction between SDS and APU.
Hydrophobic aggregation plays a significant role in the formation of ionomer complexes.
The ratio of SDS to APU is a critical factor determining the complexation outcome and NP stability.