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A SURFACTANT-ASSISTED APPROACH FOR PREPARING COLLOIDAL AZO POLYMER SPHERES WITH NARROW SIZE DISTRIBUTION

Xiao-lan Tong

Department of Chemical Engineering and Laboratory for Advanced Materials, Tsinghua University, Beijing, 100084, China

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Yao-bang Li

Department of Chemical Engineering and Laboratory for Advanced Materials, Tsinghua University, Beijing, 100084, China

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Ya-ning He

Department of Chemical Engineering and Laboratory for Advanced Materials, Tsinghua University, Beijing, 100084, China

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, and

Xiao-gong Wang

Department of Chemical Engineering and Laboratory for Advanced Materials, Tsinghua University, Beijing, 100084, China

Corresponding author.

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Abstract

A surfactant-assisted method for preparing colloidal spheres with narrow size distribution from a polydispersed azo polymer has been developed in this work. The colloidal spheres were formed through gradual hydrophobic aggregation of the polymeric chains in THF-H₂O dispersion media, which was induced by a steady increase in the water content. Results showed that the addition of a small amount of surfactant (SDBS) could significantly narrow the size distribution of the colloidal spheres. The size distribution of the colloidal spheres was determined by the concentrations of azo polymer and the amount of surfactant in the systems. When the concentrations of polymer and surfactant amount were in a proper range, colloidal spheres with narrow size distribution could be obtained. The colloidal spheres formed by this method could be elongated along the polarization direction of the laser beams upon Ar⁺ laser irradiation. The colloidal spheres are considered to be a new type of the colloid-based functional materials.

The financial support by the NSFC under Projects (Nos. 50533040, 20374033) is gratefully acknowledged.

Keywords:

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