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Soft Matter Vol - 9 Issue - 6

Soft Matter Vol - 9 Issue - 5

Self-healing hydrogels formed in catanionic surfactant solutions

Content Provider	Royal Society of Chemistry (RSC)
Author	Hassan-Raeisi, Azadeh Okay, Oguz Abdurrahmanoglu, Suzan Orakdogen, Nermin Oppermann, Wilhelm Akay, Gizem Tuncaboylu, Deniz C.
Copyright Year	2013
Abstract	Physical gels with remarkable properties were obtained by copolymerization of acrylamide with the hydrophobic monomer stearyl methacrylate (C18) in a micellar solution of cetyltrimethylammonium bromide (CTAB) containing up to 15 mol% sodium dodecyl sulfate (SDS). The addition of SDS causes the CTAB micelles to grow and thus enables solubilization of C18. The gels exhibit time-dependent dynamic moduli, high elongation ratios at break (1800–5000%), and self-healing, as evidenced by rheological and mechanical measurements and substantiated by dynamic light scattering. As the size of the micelles in the gelation solution increases, both the degree of temporary spatial inhomogeneity and the lifetime of hydrophobic associations in the gels increase while the elongation ratio at break decreases. Although the physical gels were insoluble in water due to strong hydrophobic interactions, they could be solubilized in surfactant solutions thus providing a means of characterization of the network chains. Viscometric and rheological behaviors of polymer solutions show a substantial increase in the associativity of the network chains with rising micelle size, which results in prolonged lifetime of hydrophobic associations acting as physical cross-links in gels. The internal dynamics of self-healing gels could thus be controlled by the associativity of the network chains which in turn depends on the size of CTAB micelles.
Starting Page	2254
Ending Page	2261
Page Count	8
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	9
Issue Number	7
Journal	Soft Matter
DOI	10.1039/c2sm27515e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	SDS Viscometric Rheology Micelle Polymer Hydrophobe Surfactant Bromide Sodium dodecyl sulfate Acrylamide Stearyl alcohol Dynamic light scattering Monomer
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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