Graft copolymers from modified ethylene/vinyl acetate copolymers, 2. Synthesis of polystyrene‐grafted poly[ethylene‐co‐(vinyl acetate)] and evaluation of its compatibilizing effect in polystyrene/poly[ethylene‐co‐(vinyl acetate)] blends

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Abstract
Polystyrene‐grafted poly[ethylene‐co‐(vinyl acetate)] (EVA‐g‐PS) has been synthesized from functionalized polystyrene containing acyl chloride end group (PS‐COCl) and partly (5%) hydrolyzed poly[ethylene‐co‐(vinyl acetate)] (EVALVA‐5%). The graft efficiency is ca. 100% when low‐molecular‐weight polystyrene is employed. By increasing the molecular weight of the grafts the efficiency decreases. These graft copolymers have been used for compatibilizing polystyrene (PS)/poly[ethylene‐co‐(vinyl acetate)] (EVA) blends. The ability of the copolymers as compatibilizing agent has been verified by an analysis of the mechanical properties and by scanning electron microscopy.