Reversible control of micellization induced by hydrogen bond crosslinking for a nonamphiphilic diblock copolymer with an <i>α,ω</i>‐diamine

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<jats:title>Abstract</jats:title><jats:p>The micelle formation in a non‐selective solvent has great advantages in molecular designing. It has already been revealed that a poly(vinylphenol)‐block‐polystyrene diblock copolymer (PVPh‐b‐PSt) formed micelles in the presence of <jats:italic>α</jats:italic>,<jats:italic>ω</jats:italic>‐diamine in 1,4‐dioxane, a non‐selective solvent through hydrogen bond crosslinking. In this article it is reported that the dissociation‐reconstruction of the PVPh‐b‐PSt micelles with 1,4‐butanediamine (BDA) is reversibly controlled by the variation in temperature, the copolymer concentration, and the diamine concentration. Light scattering studies demonstrated that the micellization of PVPh‐b‐PSt with <jats:italic>M</jats:italic><jats:sub>n</jats:sub>(PVPh‐b‐PSt) of 10K‐b‐120K occurred at a higher BDA concentration and produced micelles with a lower aggregation number as the temperature increased. The micelles were thermally unstable and dissociated into unimers by increasing the temperature, however, the micelles were completely reconstructed by decreasing the temperature. This dissociation‐reconstruction of the micelles was perfectly controlled by the variation in temperature. An increase in the BDA concentration prevented the dissociation of the micelles but promoted the reconstruction. The increase in the BDA concentration causes an increase in the crosslinking points for hydrogen bonding in the cores of the micelles, thus preventing the dissociation of the micelles by the strong hydrogen bond crosslinking. Copyright © 2005 John Wiley & Sons, Ltd.</jats:p>

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