Ward Muscatello, MM and Stunja, LE and Thareja, P and Wang, L and Bohn, JJ and Velankar, SS and Asher, SA
(2009)
Dependence of photonic crystal nanocomposite elasticity on crystalline colloidal array particle size.
Macromolecules, 42 (13).
4403 - 4406.
ISSN 0024-9297
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Abstract
The first quantitative study of how the mechanical properties of a swollen hydrogel depend upon the diameter of nonbonded embedded nanoparticles was studied. Monodisperse, highly charged polystyrene colloidal particles with diameters between 114 and 186 nm were used in the preparation of the PCCA studied. The PCCA studied were synthesized by UV initiated free radical polymerization of a hydrogel around the CCA. The CCA solutions used for the PCCA preparations were composed of identical weight percent particle dispersions in water to ensure constant overall polymer content within the corresponding pre-polymerization solutions. This linear dependence derives primarily from the contribution of slip within the system, which varies based on the surface area of the embedded particles. We also found that the increase in storage modulus upon exclusion of oxygen during polymerization is more pronounced for hydrogels without nanoparticle inclusions and that the modulus is dominated by particle inclusions as opposed to the cross-linker.
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