As part of an ANR (France) / JST (Japan) international project dedicated to "molecular technology," the co-proposers (FG Tournilhac, A. Guimet, ESPCI and Makoto Ouchi, University of Kyoto) are currently studying structures and properties related to the self-assembly of sequence-controlled copolymers. The objective of this proposal is to understand the structure of alternating copolymers that show lower critical solution temperature (LCST) in an organic solvent whereas random copolymers of same composition do not. SANS beamtime is requested to produce reliable structural data with single-chain resolution from radiation-sensitive polymer samples.