Pseudopolyrotaxanes are obtained by the threading of a polymeric guest through strings of cyclic host molecules. One typical example of pseudopolyrotaxanes (PPR) forms when a poly(ethylene glycol) (the guest) and cyclodextrins (CD, the hosts) are dissolved and mixed in water. We investigated 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 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.

Threading, growth and aggregation of pseudopolyrotaxanes / P.Lo Nostro;L. Giustini;E. Fratini; B.Ninham; F.Ridi; P.Baglioni. - STAMPA. - 239:(2010), pp. 3-COLL. (Intervento presentato al convegno 239th A.C.S. National Meeting tenutosi a San Francisco, CA nel 19-26 marzo 2010).

Threading, growth and aggregation of pseudopolyrotaxanes

LO NOSTRO, PIERANDREA;GIUSTINI, LUCA;FRATINI, EMILIANO;RIDI, FRANCESCA;BAGLIONI, PIERO
2010

Abstract

Pseudopolyrotaxanes are obtained by the threading of a polymeric guest through strings of cyclic host molecules. One typical example of pseudopolyrotaxanes (PPR) forms when a poly(ethylene glycol) (the guest) and cyclodextrins (CD, the hosts) are dissolved and mixed in water. We investigated 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 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.
2010
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
239th A.C.S. National Meeting
San Francisco, CA
P.Lo Nostro;L. Giustini;E. Fratini; B.Ninham; F.Ridi; P.Baglioni
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/776465
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