Surface mobility gradient and emergent facilitation in glassy films
Soft Matter(2024)
摘要
Confining glassy polymer into films can substantially modify their local and
film-averaged properties. We present a lattice model of film geometry with
void-mediated facilitation behaviors but free from any elasticity effect. We
analyze the spatially varying viscosity to delineate the transport property of
glassy films. The film mobility measurements reported by [Yang et. al.,
Science, 2010, 328, 1676] are successfully reproduced. The flow exhibits a
crossover from simple viscous flow to a surface-dominated regime as temperature
decreases. The propagation of a highly mobile front induced by the free surface
is visualized in real space. Our approach provides a microscopic treatment of
the observed glassy phenomena.
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