AbstractWater–organic solvents emulsions based on toluene,nhexane,n‐dodecane, and decaline are stabilized by new A(B)2star‐shaped block copolymers. B is a polyoxirane block and A a polydiene or polyvinyl one. The influence of the molecular parameters of the copolymers has been studied; low‐molecular‐weight (±5000) copolymers containing 50% of polyoxirane have the originality to generate both O/W and W/O stable emulsions. The importance of the molecular architecture of block copolymers on their stabilizing efficiency has been put in evidence. For instance, 7/3 water–toluene emulsions are more efficiently stabilized by star‐shaped block copolymers, whereas linear block copolymers give better results for 3/7 water–t
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