Copolymer excess scattering

Baldwin studied the kinetics of the copolymerization of isobutyl vinyl ether and MA in ethyl acetate at 60°C. Ethyl acetate was used because it is a good solvent for both monomers, copolymer, and initiators. The maximum rate was observed at a vinyl isobutyl ether-MA mole ratio of 4 1 and very low rates were obtained in the presence of large excesses of anhydride. For a 5.5 1 mole ratio, the rate was linear until the anhydride was consumed and zero order with respect to the vinyl ether. All copolymers were equimolar in composition. From light-scattering studies on a series of copolymers in tetrahy-... 

Abstract Copolymers of 1,4-polyisoprene-polyacetylene with up to 25% polyacetylene are soluble in organic solvents and, like native polyacetylene, have interesting electrical and non linear optical properties. Because the molecules are amphiphilic techniques analogous to Langmuir-Blodgett methods may prove useful for self assembly and so here we study the surface excess of toluene solutions by the specular reflection of neutrons. A surface layer structure with excess PA at the air/solvent interface is characterised using the isotopic replacement method in neutron scattering. 

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