We present a simplified model for calculating the product distribution
of degradable polymers which is based on a grand canonical approach.
The distribution depends on two physical parameters, the energy of a b
ond formation and the initial concentration of monomers. Due to its si
mplicity this model covers the two limiting cases, namely a polymeriza
tion process (no degradation) and micellar association (dominant degra
dation), and allows for straightforward extension to branched chain to
pologies or flow fields. In shear flow, a flow rate dependent length d
istribution leads to shear thinning.