NDLI: Effect of alcohols on the heat of micellization of Pluronic F88 aqueous solutions

Content Provider	Springer Nature Link
Author	Hsu, Ya Hui Tsui, Hung Wei Lee, Chin Fen Chen, Shin Hong Chen, Li Jen
Copyright Year	2015
Abstract	The effects of addition of alcohols (ethanol, 1-propanol, and 1-butanol) to Pluronic F88 aqueous solutions on heat of micellization of Pluronic F88 are carefully examined by using high sensitivity differential scanning calorimeter and dynamic light scattering. With addition of ethanol to Pluronic F88 aqueous solutions, the critical micelle temperature (CMT) increases, the heat of micellization significantly decreases, and the F88 concentration region of the unusual positive heat capacity change (attributed to impurity aggregates) occurs at higher Pluronic F88 concentrations. The addition of ethanol increases the solubility of copolymer and impurities and, hence, hinders the formation of impurity aggregates. Introduction of butanol to F88 aqueous solutions would significantly reduce the CMT but only slightly change the heat of micellization, indicating exothermic interactions of 1-butanol with poly(propylene oxide) blocks. With addition of 1-propanol, both CMT and heat of micellization decrease. With addition of 5 wt.% 1-propanol would substantially expand the F88 concentration region of the unusual positive heat capacity change, indicating a significant dissociation of impurity aggregates into micelles. In addition, the effect of alcohols on the cloud points of Pluronic F88 solutions is also carefully examined and discussed. The enthalpy-entropy compensation phenomenon for the micellization of Pluronic F88 over the concentration regions of negative/positive heat capacity changes is discussed.
Starting Page	3403
Ending Page	3415
Page Count	13
File Format	PDF
ISSN	0303402X
Journal	Colloid and Polymer Science
Volume Number	293
Issue Number	12
e-ISSN	14351536
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-06-23
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Heat of micellization Pluronic Cloud point Enthalpy-entropy compensation micellization Alcohol Polymer Sciences Soft and Granular Matter, Complex Fluids and Microfluidics Characterization and Evaluation of Materials Physical Chemistry Food Science Nanotechnology and Microengineering
Content Type	Text
Resource Type	Article
Subject	Colloid and Surface Chemistry Materials Chemistry Physical and Theoretical Chemistry Polymers and Plastics

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