Abstract
We discuss the structure of the opaque poly(acrylamide) gel that is synthesized at higher mole fractions of the cross-linking agent above 0.2. The structure of the opaque gel is analyzed by the small angle neutron scattering technique. The fractal analysis of the scattering function yields that the polymer network of the opaque poly(acrylamide) gel can be seen as a mass fractal of the fractal dimension of about DM ∼ 2.7 when the mole fraction of the cross-linker is higher than 0.3. On the other hand, much larger exponents are obtained in the lower concentration region of the cross-linker less than 0.3. It suggests that the polymer network of the gel behaves as a surface fractal of the fractal dimension of DS ∼ 2.5. The structure of the polymer network changes from the surface fractal to the mass fractal at the mole fraction of the cross-linker is 0.3 when the mole fraction of the cross-linker is increased from 0.2 to 0.5. The structure of the gel is also observed by using the confocal laser scanning microscope. The fractal analysis of the confocal images indicate that the fractal dimension of the two dimensional distribution of the colloidal particles in the cross section of the colloidal aggregate is found to be about 1.7.
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Mukai, Sa., Miki, H., Garamus, V., Willmeit, R., Tokita, M. (2009). Structural Transition of Non-ionic Poly(acrylamide) Gel. In: Tokita, M., Nishinari, K. (eds) Gels: Structures, Properties, and Functions. Progress in Colloid and Polymer Science, vol 136. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-00865-8_13
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DOI: https://doi.org/10.1007/978-3-642-00865-8_13
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-00864-1
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