Tailoring the flow of soft glasses by soft additives |
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Authors: | Zaccarelli E Mayer C Asteriadi A Likos C N Sciortino F Roovers J Iatrou H Hadjichristidis N Tartaglia P Löwen H Vlassopoulos D |
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Affiliation: | Dipartimento di Fisica and CNR-INFM-SOFT, Università di Roma La Sapienza, Rome, Italy. |
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Abstract: | We examine the vitrification and melting of asymmetric star polymer mixtures by combining rheological measurements with mode coupling theory. We identify two types of glassy states, a single glass, in which the small component is fluid in the glassy matrix of the big one, and a double glass, in which both components are vitrified. Addition of small-star polymers leads to melting of both glasses, and the melting curve has a nonmonotonic dependence on the star-star size ratio. The phenomenon opens new ways for externally steering the rheological behavior of soft matter systems. |
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