Association Behavior of Fluorine-Containing and Non-Fluorine-Containing Methacrylate-Based Amphiphilic Diblock Copolymer in Aqueous Media

摘要

Fluorine-containing amphiphilic block copolymers,poly(sodium methacrylate)-block-poly(nonafluorohexyl methacrylate) (NaMA_m-b-NFHMA_n) (m:n = 61:12,72:33,64:57),and the corresponding non-fluorine-containing amphiphilic block copolymer,poly(sodium methacrylate)-block-poly(hexyl methacrylate) (NaMA_m-b-HMA_n) (m:n=64:10,69:37,67:50),were synthesized.Both polyNaMA-b-polyNFHMA and polyNaMA-6-polyHMA formed micelles above critical micelle concentrations,(cmc's),around 3X10~(-5) to 1X10~(-4) mol/L,while neither polymer decreased surface tension of aqueous solutions.The size and shape of the micelles were examined by dynamic light scattering,small-angle neutron scattering,and small-angle X-ray scattering.PolyNaMA-6-polyHMA appeared to form only spherical micelles,while polyNaMA-b-polyNFHMA with a long NFHMA segment formed both spherical and rodlike micelles.The micelles of fluorine-containing block copolymers were obviously larger than those of non-fluorine-containing block copolymers with the same chain length and the same hydrophilic/hydrophobic chain ratio.The fluorine-containing block copolymer selectively solubilized fluorinated dye into the water phase when a mixture of decafluorobiphenyl and 2,6-dimethylnaphthalene was added to the micelle solution.