AbstractFour polystyrene samples, with molecular weight ranging from 43,300 to 1,112,000 have been irradiated in benzene solution by γ‐rays, at four different intensities. Data obtained through intrinsic viscosity and light‐scattering measurements on irradiated polymers indicate that, at each intensity, there exists a molecular weight below which any polymer chain is no further degraded. An equilibrium between absorbed and dissipated energy by the macromolecule is supposed, and the equation,MlimI= const. arrived at in a previous study, is verified also by the present experimental res
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