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Topic

Swelling

About: Swelling is a(n) research topic. Over the lifetime, 8395 publication(s) have been published within this topic receiving 200488 citation(s).

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Papers
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Journal ArticleDOI: 10.1063/1.1723792
Abstract: The interaction of solvents with cross‐linked network structures, such as occur in vulcanized rubber, is subjected to a statistical mechanical treatment based on the model and procedure presented in the preceding paper. The activity of the solvent is expressed as a function of its concentration in the swollen network, and of the degree of cross‐linking. The maximum degree of swelling of the network in contact with the pure solvent is related to the degree of cross‐linking. The heat of interaction of the solvent with the network can be calculated from the temperature coefficient of maximum swelling. The theory leads to the conclusion that the swelling capacity should be diminished by the application of an external stress. Furthermore, the modulus of elasticity should decrease inversely with the cube root of the swelling volume.

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Topics: Swelling capacity (62%), Swelling (56%)

2,741 Citations


16 Aug 2002-Advanced Materials
Abstract: Novel nanocomposite hydrogels (NC gels) with a unique organic-inorganic (clay) network structure (see Figure) have been synthesized by in-situ free radical polymerization. The resulting NC gels exhibit high structural homogeneity, superior elongation with near-complete recovery, good swellability, and rapid deswelling in response to temperature changes.

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Topics: Radical polymerization (57%), Swelling (51%)

1,671 Citations


Journal ArticleDOI: 10.1063/1.437602
Abstract: We present a theory of the kinetics of the swelling of a gel. The characteristic time of swelling is proportional to the square of a linear dimension of the gel and is also proportional to the diffusion coefficient of the gel network, which is defined as D=E/f where E is the longitudinal bulk modulus of the network, and f is the coefficient of friction between the network and the gel fluid. This constitutes an essential difference between the present theory and the previous theory which is based on the assumption that the swelling time is determined by the diffusion coefficient of the fluid molecules. Experimental data are shown for spheres of 5% polyacrylamide gels and are analyzed using the present theory. The value of the diffusion coefficient obtained from the macroscopic swelling experiments shows excellent agreement with that obtained microscopically using laser light scattering spectroscopy.

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Topics: Swelling (55%), Diffusion (51%)

1,345 Citations


Journal ArticleDOI: 10.1039/DF9541800120
Topics: Montmorillonite (58%), Swelling (55%)

1,075 Citations


Patent
06 Nov 1990-
Abstract: A controlled release drug delivery device, comprised of swellable polymers, whose degree of swelling in an environment of use is controlled by swelling modulators blended within the polymers, is disclosed. The swelling modulators can include buffers, osmagents, surfactants or combinations thereof surrounded by a microporous coating or interspersed within individual matrices. The combination of controlled release swelling modulators with swellable polymers may be applied to regulate patterns of beneficial agent (typically a drug) release.

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Topics: Controlled release (58%), Swelling (53%)

842 Citations


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