Self-Aggregation of Gel Forming PEG-PLA Star Block Copolymers in Water (Articolo in rivista)

Type
Label
  • Self-Aggregation of Gel Forming PEG-PLA Star Block Copolymers in Water (Articolo in rivista) (literal)
Anno
  • 2010-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1021/la101613b (literal)
Alternative label
  • Calucci, Lucia ; Forte, Claudia; Buwalda, Sytze J.; Dijkstra, Pieter J.; Feijen, Jan (2010)
    Self-Aggregation of Gel Forming PEG-PLA Star Block Copolymers in Water
    in Langmuir
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Calucci, Lucia ; Forte, Claudia; Buwalda, Sytze J.; Dijkstra, Pieter J.; Feijen, Jan (literal)
Pagina inizio
  • 12890 (literal)
Pagina fine
  • 12896 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 26 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 15 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Lucia Calucci: Istituto per i Processi Chimico-Fisici, CNR-Consiglio Nazionale delle Ricerche, Pisa; Claudia Forte: Istituto per i Processi Chimico-Fisici, CNR-Consiglio Nazionale delle Ricerche, Pisa; Sytze J. Buwalda: Department of Polymer Chemistry and Biomaterials, Faculty of Science and Technology, MIRA Institute for Biomedical Technology, University of Twente, The Netherlands; Pieter J. Dijkstra: Department of Polymer Chemistry and Biomaterials, Faculty of Science and Technology, MIRA Institute for Biomedical Technology, University of Twente, The Netherlands; Jan Feijen: Department of Polymer Chemistry and Biomaterials, Faculty of Science and Technology, MIRA Institute for Biomedical Technology, University of Twente, The Netherlands (literal)
Titolo
  • Self-Aggregation of Gel Forming PEG-PLA Star Block Copolymers in Water (literal)
Abstract
  • The aggregation behavior and dynamics of poly(ethylene glycol) (PEG) and poly(lactide) (PLA) chains in a homologous series of eight-armed PEG-PLA star block copolymers ((PEG65-NHCO-PLAn)8 with n = 11, 13, and 15) in water at different concentrations and temperatures were studied by means of 1H and 13C NMR spectroscopy and 1H longitudinal relaxation time analysis. The state of water in these systems was also investigated through the combined use of 1H and 2H longitudinal relaxation time measurement. On the basis of the NMR experimental findings and of dynamic light scattering measurements, (PEG65-NHCO-PLAn)8 in water can be described as self-aggregated systems with quite rigid hydrophobic domains made of PLA chains and aqueous domains where both PEG chains and water molecules undergo fast dynamics. A smaller number of rigid domains was found for (PEG65-NHCO-PLA11)8 with respect to the homologous copolymers with longer PLA chains. At low concentrations, the PLA domains are mainly formed by chains belonging to the same molecule, thus giving rise to unimolecular micelles. At intermediate concentrations, that is, above the critical association concentration (CAC) but below the critical gel concentration (CGC), nanogels are formed by interconnection of several PLA domains through shared unimers. Above the CGC, the network is extended to the entire system, giving rise to macroscopic gels. In all cases, a fraction of PLA chains remains quite mobile and exposed to water due to topological constraints of the star architecture. (literal)
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