Abstract
Chain dimensions of the polystyrene-d 8 parts of a styrene-d 8-2-vinylpyridine block copolymer (DP-33) and a styrene-d 8-styrene-h 8 block copolymer (DH-44), both with 50:50 compositions, were measured in dilute solutions of pyridine (a common good solvent) benzene (a selective solvent) and methyl ethyl ketone (a poor solvent) by small-angle neutron scattering. The conformation of one block chain within a diblock copolymer is not affected by the existence of another block chain, regardless of the solvent power at least when the composition of the diblock copolymer is 50:50, and the molecular weight is not high.
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