Colloidal particles of three‐block copolymers polycaprolactam‐block‐polystyrene‐block‐polycaprolactam, formed in a solvent mixture toluene/2,2,3,3‐tetrafluoropropanol as a good solvent of polycaprolactam, were studied by static and dynamic light scattering and transmission electron microscopy. Two kinds of spherical multimolecular particles differing in size were found in the solution. The smaller particles containing tens of copolymer molecules were interpreted as regular copolymer micelles, and the larger particles formed from thousands of copolymer molecules were interpreted as associates of these micelles.
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Tuzar et al. (1988) studied this question.
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