Influence of the molecular mass distribution on the thermostability of a polysulphone

It is shown that the thermostability of an aromatic polysulphone determined from change in the optical properties and oxygen uptake largerly depends on the character of the MD. The high molecular weight fractions of polysulphone are unstable in the individual state although their thermostability synergically rises in presence of low molecular weight fractions. The influence of the MD on the thermostability of a polysulphone is also related to change in the content of the terminal hydroxyl groups.