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Aggregation in aqueous media of tri-block copolymers tuned by the molecular selectivity of cyclodextrins

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Abstract

The water + cyclodextrin + poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) mixtures have been investigated to explore the temperature effect on the aggregation of the copolymer in the presence of cyclodextrins (CDs). The CDs with different cavity sizes were chosen because they may include either the hydrophilic poly(ethylene oxides) block or both kinds of blocks. The differential scanning calorimetry and viscosity experiments straightforwardly evidenced that the critical micellar temperature is shifted to larger values by adding a CD which is able to include the middle poly(propylene oxide) block while it is not influenced by the presence of CD which is selective to the poly(ethylene oxide) block. The enthalpy of aggregation decreases upon the CD addition for all the investigated systems.

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Acknowledgements

The work was financially supported by the University of Palermo.

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  1. Dipartimento di Chimica Fisica “F. Accascina”, Università degli Studi di Palermo, Viale delle Scienze, Parco D’Orleans II, 90128, Palermo, Italy

    Rosario De Lisi & Giuseppe Lazzara

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  1. Rosario De Lisi
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  2. Giuseppe Lazzara
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Correspondence to Giuseppe Lazzara.

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De Lisi, R., Lazzara, G. Aggregation in aqueous media of tri-block copolymers tuned by the molecular selectivity of cyclodextrins. J Therm Anal Calorim 97, 797–803 (2009). https://doi.org/10.1007/s10973-009-0223-0

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