http://www.cnr.it/ontology/cnr/individuo/prodotto/ID33011
Phase Transitions in Aqueous triblock copolymers: NMR relaxation studies (Articolo in rivista)
- Type
- Label
- Phase Transitions in Aqueous triblock copolymers: NMR relaxation studies (Articolo in rivista) (literal)
- Anno
- 2003-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1007/s00396-003-0888-z (literal)
- Alternative label
Iovino A., La Mesa C., Capitani D., Segre A.L. (2003)
Phase Transitions in Aqueous triblock copolymers: NMR relaxation studies
in Colloid and polymer science (Print)
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Iovino A., La Mesa C., Capitani D., Segre A.L. (literal)
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- http://dx.doi.org/10.1007/s00396-003-0888-z (literal)
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- Articolo Scientifico in cui tramite misure rilassometriche si caratterizza un copolimero a blocchi in relazione al suo comportamento in soluzione acquosa. (literal)
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- Scopu (literal)
- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Istituto di Metodologie Chimiche
Dipartimento di Chimica, Sapienza Università di Roma (literal)
- Titolo
- Phase Transitions in Aqueous triblock copolymers: NMR relaxation studies (literal)
- Abstract
- Longitudinal NMR relaxation times were used to investigate the thermal transitions occurring in an aqueous triblock copolymer of the poly(oxyethylene)poly(oxypropylene)poly(oxyethylene) family. In such a system moleculemicelle and micelleliquid crystal transitions are observed, depending on temperature and composition. The longitudinal relaxation time, R 1, significantly changes when the aforementioned phase transitions take place. In the case of moleculemicelle equilibrium, changes in R 1 values of the methyl (and methynic) group signal, located in the lipophilic portion of block copolymers, are observed. The effect is ascribed to a significant dehydration of the poly(oxypropylene) chains, as a consequence of micelle formation. Conversely, the thermal transitions from micelles to liquid-crystalline phases are associated with significant changes in the relaxation time of poly(oxyethylene) units. The latter effect is tentatively ascribed to a partial dehydration and/or interdigitation of the poly(oxyethylene) moieties in the block copolymer. (literal)
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