Preparation and properties of rubberlike high polymers. V. Influence of nitrile groups on the properties of copolymers

Physical and mechanical properties of copolymers from dienes and acrylic nitrile have been studied. The gradual increase of density is an indication of the strong intermolecular forces exerted by nitrile groups. The mutual interaction of nitrile groups and methyl groups leads to a reduction of the mobility of flow units. This can be deduced from a relative comparison of hardness, elastic recovery, stress–strain properties, and brittle point of the three polymer‐homologous series.