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Science 23 June 1995:
Vol. 268. no. 5218, pp. 1728 - 1731
DOI: 10.1126/science.268.5218.1728
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Articles

Multiple Morphologies of "Crew-Cut" Aggregates of Polystyrene-b-poly(acrylic acid) Block Copolymers

Lifeng Zhang 1 and Adi Eisenberg 1

1 Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, Quebec, H3A-2K6, Canada

The observation by transmission electron microscopy of six different stable aggregate morphologies is reported for the same family of highly asymmetric polystyrene-poly-(acrylic acid) block copolymers prepared in a low molecular weight solvent system. Four of the morphologies consist of spheres, rods, lamellae, and vesicles in aqueous solution, whereas the fifth consists of simple reverse micelle-like aggregates. The sixth consists of up to micrometer-size spheres in aqueous solution that have hydrophilic surfaces and are filled with the reverse micelle-like aggregates. In addition, a needle-like solid, which is highly birefringent, is obtained on drying of aqueous solutions of the spherical micelles. This range of morphologies is believed to be unprecedented for a block copolymer system.

Submitted on February 21, 1995
Accepted on April 27, 1995


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