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| Home > Publications database > SANS study on the surfactant effect on nanophase separation in epoxy-based hydrogels prepared from α,ω-diamino terminated polyoxypropylene and polyoxyethylene bis(glycidyl ether) |
| Journal Article | FZJ-2016-07673 |
;
2016
Elsevier
New York, NY [u.a.]
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Please use a persistent id in citations: doi:10.1016/j.eurpolymj.2016.10.049
Abstract: Effect of a cationic surfactant (myristyltrimethylammonium bromide, C14TAB) on swelling behaviour of epoxy network containing polyoxyethylene (POE) and polyoxypropylene (POP) and structure of resulting hydrogels was studied using small-angle neutron scattering (SANS).Nanophase separated structure of hydrogel prepared by swelling of the network in pure water was revealed. Characteristic length scale of the structure as measured by Bragg’s distance is ca 78 Å. The structure consists of water-poor and water-rich nanodomains separated by a diffuse interface of effective thickness ca 5 Å. Presence of the surfactant in swelling solution has a strong effect on swelling behaviour of the epoxy network and structure of resulting hydrogels. At the macroscopic level, both, the swelling degree and surfactant uptake by the network increase considerably with growing surfactant concentration in swelling solution. At the microscopic level, the two-phase nanophase separated structure is preserved, however, it becomes finer as expressed by a continuous decay of Bragg’s distance from 78 Å (in absence of the surfactant) to 61 Å (highest surfactant concentration). Effective thickness of interface varies between ca 3–6 Å. Presence of the surfactant also induces variation of the neutron scattering length density at much longer length scale of ca 200–1200 Å. Strong binding of the surfactant to POP chains in epoxy network is responsible for the effects observed.
Keyword(s): Polymers, Soft Nano Particles and Proteins (1st) ; Soft Condensed Matter (2nd)
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