title: Structural arrest in dense star-polymer solutions.
abstract: The dynamics of star polymers is investigated via extensive molecular and Brownian dynamics simulations for a large range of functionality f and packing fraction eta. The calculated isodiffusivity curves display both minima and maxima as a function of eta and minima as a function of f. Simulation results are compared with theoretical predictions based on different approximations for the structure factor. In particular, the ideal glass transition line predicted by mode-coupling theory is shown to exactly track the isodiffusivity curves, offering a theoretical understanding for the observation of disordered arrested states in star-polymer solutions.
authors.affiliation: Dipartimento di Fisica and INFM Center for Statistical Mechanics and Complexity, Università di Roma La Sapienza, Piazzale Aldo Moro 2, I-00185 Rome, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Foffi
authors.forename: F
authors.initials: F
authors.lastname: Sciortino
authors.forename: P
authors.initials: P
authors.lastname: Tartaglia
authors.forename: E
authors.initials: E
authors.lastname: Zaccarelli
authors.forename: F
authors.initials: F
authors.lastname: Lo Verso
authors.forename: L
authors.initials: L
authors.lastname: Reatto
authors.forename: K A
authors.initials: KA
authors.lastname: Dawson
authors.forename: C N
authors.initials: CN
authors.lastname: Likos