Dimethylsiloxane‐ethylene oxide block copolymers, 2. Preliminary results on dilute solution properties

The dilute solution properties of poly(ethylene oxide)‐polydimethylsiloxane‐poly(ethylene oxide) (POE‐PDMS‐POE) triblock copolymers, of a POE‐PDMS segmented block copolymer and of a grafted PDMS‐g‐(POE‐co‐POP) copolymer are investigated by means of viscosity, light scattering and small angle neutron scattering. The experiments indicate that the copolymers are molecularly dispersed or aggregated, depending on the properties of the solvents. A rather compact conformation is deduced from the viscosity measurements. Negative A2‐values are observed in preferential solvents for one of the segments, a positiv A2‐value in a common solvent for both segments forming the block copolymer.