| Abstract: | The available literature data on the phase equilibrium in the systems PS ‐ PMMA and PS ‐ (MMA‐S) copolymers of various compositions are ambiguous. The most contradictory results were obtained for mixtures formed from solutions [1‐3]: This fact can result, first, from the low compatibility of the polymers, which borders on the sensitivity of the testing methods used, and second, from specific interactions between the components. In the present work, the polymer compatibility was studied using an optical interferometer [4]. The sensitivity of this method is limited by the translational mobility of molecules, ∼10−9 cm2/s, so the measurements were carried out at high temperatures close to the destruction temperatures of PMMA and its copolymers. The specific feature of optical interferometry is that the studies are carried out in thin layer; this enables visual separation and estimation of the effect of the destruction products and the destruction process on the compatibility of polymers. Therefore, the purpose of this work was to study the effect of the thermal destruction products on the interference of the destructed polymer and on the diffusion transition zone of polymers in order to obtain the most complete data on the compatibility of the polymers over a broad composition range. |
