Micelle formation of a nonamphiphilic poly(vinylphenol)-<Emphasis Type="Italic">block</Emphasis>-polystyrene diblock copolymer in ethyl acetate |
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Authors: | Email author" target="_blank">Eri?YoshidaEmail author Yoshikazu?Terada |
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Institution: | (1) Department of Materials Science, Toyohashi University of Technology, 1-1, Hibarigaoka, Tempaku-cho, Toyohashi, Aichi 441-8580, Japan;(2) Department of Polymer Science and Engineering, Kyoto Institute of Technology, Goshokaido-cho, Matsugasaki, Sakyo, Kyoto 606-8585, Japan |
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Abstract: | The micelle formation of a poly(vinylphenol)-block-polystyrene diblock copolymer was studied in ethyl acetate, a nonselective solvent using α,ω-diamine. The copolymer formed
micelles in ethyl acetate in the presence of a small amount of the α,ω-diamine. Light scattering studies demonstrated that
the micellization was dependent on the grade, the bulkiness, and the conformation of the diamines. The copolymer needed more
diamine with the increasing grade of the diamine, due to a decrease in the basicity of the diamine. The bulkiness of the diamines
also reduced the efficiency of the micellization by hindering the formation of the hydrogen bond cross-linking. Similarly,
the conformation of the diamine affected the micellization, since the conformation determined the intramolecular spatial distance
between the animo groups. Trans-1,2-cyclohexanediamine was more effective than the cis-isomer to produce the micelles. Furthermore,
(1S,2S)-(+)-1,2-cyclohexanediamine, one of the mirror image isomers composing the trans-isomer, was more effective in producing
the micelles than the trans-isomer. The interaction between the mirror image isomers also obstructed the micellization. The
micellization, coupled with the thermoresponsivity of the micelles, were influenced by the solvent quality. The dissociation
of the micelles into unimers was suppressed in ethyl acetate, while the reconstruction was promoted, in comparison with those
in 1,4-dioxane and THF. |
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Keywords: | Poly(vinylphenol)-block-polystyrene (PVPh-b-PSt) α ω -Diamine Micelles Hydrodynamic radius Aggregation number |
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