Abstract
AbstractBlock copolymers were prepared by anionic polymerization and their dynamic mechanical properties and thermal stability were compared with those of random copolymers and mechanical blends of similar composition. The block copolymers were prepared by means of Na‐naphthalene as the initiator, under conditions leading in most cases to almost complete absence of contaminating homopolymers. The composition, structure, and molecular weight of the block copolymers were determined by (a) molecular weight determinations of the polymers before and after addition of the second monomer to the preformed polymeric anions, and (b) by fractionation and chemical analysis of the resulting fractions. The block copolymers prepared were of the type: poly(α‐methyl styrene) ‐ polystyrene ‐ poly(α‐methylstyrene), polystyrene ‐ poly(α‐methylstyrene)‐polystyrene, poly(methyl methacrylate)‐polystyrene‐poly(α‐methyl methacrylate), and poly(ethylene oxide)‐polystyrene‐poly(ethylene oxide). The various block copolymer systems showed considerable differences in dynamic mechanical properties among themselves; they also had properties differing from those of copolymers and blends.
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