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Interaction of premicellar states of a PEO-PPO-PEO triblock copolymer with partially hydrophobic substances: NMR study
- 1.0376309 - ÚMCH 2013 RIV US eng J - Journal Article
Kříž, Jaroslav
Interaction of premicellar states of a PEO-PPO-PEO triblock copolymer with partially hydrophobic substances: NMR study.
Journal of Physical Chemistry B. Roč. 116, č. 14 (2012), s. 4386-4393. ISSN 1520-6106. E-ISSN 1520-5207
R&D Projects: GA ČR GA203/09/1478; GA ČR GAP205/11/1657
Institutional research plan: CEZ:AV0Z40500505
Institutional support: RVO:61389013
Keywords : pluronics * hydrophobic interaction * NMR
Subject RIV: CD - Macromolecular Chemistry
Impact factor: 3.607, year: 2012
According to 1H and 13C NMR spectra, relaxations, and PFG NMR self-diffusion measurements, partially hydrophobic additives methyl–ethyl ketone (MEK), methyl-isopropyl ketone (MIPK), and methyl-t-butyl ketone (MTBK) facilitate the conformation change and subsequent self-association of the copolymer Pluronic L64. The correlation time (4–9 ms) and activation energy (43–52 kJ/mol) of transition between its conformation states decrease with the increasing hydrophobicity and bulkiness of the additive. The temperature of the first PPO self-association decreases in the same order (by 4 K for MTBK).
Permanent Link: http://hdl.handle.net/11104/0006951
Number of the records: 1