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We use a mixture of a polymer and its dimer to control dynamics in a mannerinspired by \emph{pinning} a fraction of the system. In our system of$\alpha$-methyl styrene, where the polymer has a glass transition at highertemperature than the dimer, at intermediate temperatures, the polymer acts to"pin" the dimer. Within this temperature range, we use differential scanningcalorimetry to infer a point-to-set length which we find to be profoundlyinfluenced by the degree of pinning. We determine the dynamics of the systemwith dielectric spectroscopy and find that while the dynamics are verysubstantially slowed by the "pinning", the fragility exhibits only a smallchange relative to the precision of our measurements. This may indicate that inthe approach we have used, fragility has a relatively weak dependence onquantities such as the point--to--set length. % than one might expect, However,an alternative explanation is that the dimer may act to \emph{plasticize} thepolymer and thus open routes to relaxation that may be inaccessible to fullypinned systems.

Towards the ideal glass transition by pinning in a dimer-polymer mixture