Collective dynamics of random polyampholytes

We consider the Langevin dynamics of a semi-dilute system of chains which a re random polyampholytes of average monomer charge q and with fluctuations in this charge of size Q(-1) and with freely floating counter-ions in the s urrounding. We cast the dynamics into the functional integral formalism and average over the quenched charge distribution in order to compute the dyna mic structure factor and the effective collective potential matrix. The res ults are given for small charge fluctuations. In the limit of finite q we t hen find that the scattering approaches the limit of polyelectrolyte soluti ons. (C) 1999 American Institute of Physics. [S0021-9606(99)52009-6].