Novel amphiphilic random copolymers carrying poly(oxyethylene) and poly(siloxane) pendant chains are synthesized by atom transfer radical polymerization starting from either a fluorescent, julolidine-based initiator, or a nonfluorescent initiator. For both copolymer systems, dynamic light scattering measurements carried out on aqueous solutions as a function of temperature reveal the occurrence of a sharp and fully reversible transition between two different self-associative states of individual, single-chain self-folded nanoassemblies, so-called unimer micelles, (Dh= 8–10 nm) and collapsed multichain aggregates (Dh= 700–1400 nm) at a critical temperature Tc. Covalently linked julolidine terminal and added ethidium bromide are separately used as fluorescent probes and both prove the temperature-dependence of the different self-association of the copolymers in water.

The Temperature-Responsive Nanoassemblies of Amphiphilic Random Copolymers Carrying Poly(siloxane) and Poly(oxyethylene) Pendant Chains

Martinelli, Elisa
Primo
;
ANNUNZIATA, LUISA;Guazzelli, Elisa;Pucci, Andrea;Biver, Tarita;Galli, Giancarlo
Ultimo
2018-01-01

Abstract

Novel amphiphilic random copolymers carrying poly(oxyethylene) and poly(siloxane) pendant chains are synthesized by atom transfer radical polymerization starting from either a fluorescent, julolidine-based initiator, or a nonfluorescent initiator. For both copolymer systems, dynamic light scattering measurements carried out on aqueous solutions as a function of temperature reveal the occurrence of a sharp and fully reversible transition between two different self-associative states of individual, single-chain self-folded nanoassemblies, so-called unimer micelles, (Dh= 8–10 nm) and collapsed multichain aggregates (Dh= 700–1400 nm) at a critical temperature Tc. Covalently linked julolidine terminal and added ethidium bromide are separately used as fluorescent probes and both prove the temperature-dependence of the different self-association of the copolymers in water.
2018
Martinelli, Elisa; Annunziata, Luisa; Guazzelli, Elisa; Pucci, Andrea; Biver, Tarita; Galli, Giancarlo
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/925277
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