Slow regions percolate near glass transition

A nanosecond scale in situ probe reveals that a bulk linear polymer undergoes a sharp phase transition as a function of the degree of conversion, as it nears the glass transition. The scaling behaviour is in the same universality class as percolation. The exponents $\gamma$ and $\beta$ are found to be $1.7 \pm 0.1$ and $0.41\pm 0.01$ in agreement with the best percolation results in three dimensions