TY - JOUR
T1 - Effects of Polypropylene Glycol 400 (PPG400) on the Micellization and Gelation of Pluronic F127
AU - Lima, Carolina Moura de
AU - Siqueira, Sônia M. C.
AU - Amorim, Antonia F. V. de
AU - Costa, Kamilla B. S.
AU - Brito, Débora H. A. de
AU - Ribeiro, Maria E. N. P.
AU - Ricardo, Nadja M. P. S.
AU - Chaibunditc, Chiraphon
AU - Yeates, Stephen G.
AU - Ricardo, Nágila M. P. S.
N1 - This work was supported by CNPq, the Brazilian Research Council (Processo 304392/2013-8) and INCT (N. M. P. S. R.), CAPES (C.M.L.) the PSU Research fund, Thailand (C. C.), and the Organic Materials Innovation Centre, University of Manchester.
PY - 2015
Y1 - 2015
N2 - In dilute aqueous solution unimers of Pluronic F127 associate to form micelles. In more concentrated solution, micelles pack to form high-modulus gels. Our interest is the effect of addition of 10 to 30 wt% low molecular weight PPG400 on the micellization and gelation of solutions of F127. DLS was used to determine the apparent size of the micelles (rh,app)¬¬. The critical micelle concentration (cmc) using the dye solubilization method of F127 in PPG400 solutions was studied. It was carried out visual observation of mobility to detect gel formation in concentrated solutions and the onset of clouding and turbidity, as the temperature was raised. Oscillatory rheometry was used to confirm the formation of high-modulus gels and provide values of elastic moduli (G'max) over a wide temperature range. SAXS was used to determine gel structure. Our results for the hydrophobic adduct PPG400 were compared with literature values for the hydrophilic adduct PEG6000.
AB - In dilute aqueous solution unimers of Pluronic F127 associate to form micelles. In more concentrated solution, micelles pack to form high-modulus gels. Our interest is the effect of addition of 10 to 30 wt% low molecular weight PPG400 on the micellization and gelation of solutions of F127. DLS was used to determine the apparent size of the micelles (rh,app)¬¬. The critical micelle concentration (cmc) using the dye solubilization method of F127 in PPG400 solutions was studied. It was carried out visual observation of mobility to detect gel formation in concentrated solutions and the onset of clouding and turbidity, as the temperature was raised. Oscillatory rheometry was used to confirm the formation of high-modulus gels and provide values of elastic moduli (G'max) over a wide temperature range. SAXS was used to determine gel structure. Our results for the hydrophobic adduct PPG400 were compared with literature values for the hydrophilic adduct PEG6000.
KW - F127, polypropylene glycol, micelle, gel, modulus
U2 - DOI:10.1021/acs.macromol.5b01655
DO - DOI:10.1021/acs.macromol.5b01655
M3 - Article
SN - 0024-9297
VL - 48
SP - 7978
EP - 7982
JO - Macromolecules
JF - Macromolecules
IS - 21
ER -