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Meso-ordered soft hydrogels

Maria Claesson (Institutionen för kemi- och bioteknik, Teknisk ytkemi) ; K. Engberg ; C. W. Frank ; Martin Andersson (Institutionen för kemi- och bioteknik, Teknisk ytkemi)
Soft Matter (1744-683X). Vol. 8 (2012), 31, p. 8149-8156.
[Artikel, refereegranskad vetenskaplig]

Many factors such as cross-link density are known to dictate the properties of hydrogels; however, less is known about the microstructure and how it can be tailored to control the properties. Here we demonstrate a method of forming microstructured hydrogels using a soft template that allows us to control and modify the microstructure. Meso-ordered hydrogels were formed by chemically cross-linking poly(ethylene glycol)-diacrylate (PEG-DA) segments via photopolymerization in the presence of poly(ethylene glycol)-poly(propylene glycol)-poly(ethylene glycol) (EOxPOyEOx) block copolymers. The results showed that hydrogels with lamellar mesostructured regions were formed when high concentrations of PEG-DA segments (50%) were used in combination with block co-polymers having certain ratios of the hydrophilic and hydrophobic blocks (P123, EO20PO70EO20). Only lamellar mesostructures were observed, independent of the PEG molecular weight (1500 or 3400 g mol(-1)) or block co-polymer concentration (10-50%). This finding demonstrates that it is possible to form soft meso-ordered hydrogels using block co-polymers as templates, and they do not follow the same mesophase behavior as the purely self-assembled block co-polymers.

Nyckelord: lyotropic liquid-crystalline, polymer network hydrogels, mesoporous, silica, block-copolymer, photopolymerization, kinetics, nanostructure, methacrylate, templates, mechanism



Denna post skapades 2012-08-21.
CPL Pubid: 162369

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Teknisk ytkemi (2005-2014)

Ämnesområden

Kemi

Chalmers infrastruktur