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We study the effect of the molecular architecture of amphiphilic starpolymers on the shape of aggregates they form in water. Both solute and solventare considered at a coarse-grained level by means of dissipative particledynamics simulations. Four different molecular architectures are considered:the miktoarm star, two different diblock stars and a group of linear diblockcopolymers, all of the same composition and molecular weight. Aggregation isstarted from a closely packed bunch of $N_{\text a}$ molecules immersed intowater. In most cases, a single aggregate is observed as a result ofequilibration, and its shape characteristics are studied depending on theaggregation number $N_{\text a}$. Four types of aggregate shape are observed:spherical, rod-like and disc-like micelle and a spherical vesicle. We estimate"phase boundaries" between these shapes depending on the moleculararchitecture. Sharp transitions between aspherical micelle and a vesicle arefound in most cases. The pretransition region shows large amplitudeoscillations of the shape characteristics with the oscillation frequencystrongly dependent on the molecular architecture.

Shape characteristics of the aggregates formed by amphiphilic stars in water: dissipative particle dynamics study