Threading, growth, and aggregation of pseudopolyrotaxanes

Pierandrea Lo Nostro*, Luca Giustini, Emiliano Fratini, Barry W. Ninham, Francesca Ridi, Piero Baglioni

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    48 Citations (Scopus)

    Abstract

    The formation of supramolecular inclusion compounds (pseudopolyrotaxanes) produced by cyclodextrins and polymers can be monitored through turbidimetry. In this paper, we studied the kinetics of the threading of linear poly(ethylene glycol) chains of different molecular weights and of a four-arm star-like polymer as a function of temperature. The main thermodynamic parameters are extracted. The aggregation and precipitation of pseudopolyrotaxanes are described in terms of the Avrami-Erofe'ev model, which provides relevant information on the mechanism of these processes. SAXS and TGA experiments confirm the structure and hydration of the final products obtained from the different polymers. A new hypothesis for the interaction between pseudopolyrotaxanes that leads to aggregation and precipitation, based on the spatial dielectric anisotropy, is proposed.

    Original languageEnglish
    Pages (from-to)1071-1081
    Number of pages11
    JournalJournal of Physical Chemistry B
    Volume112
    Issue number4
    DOIs
    Publication statusPublished - 31 Jan 2008

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