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Investigation of swelling and diffusion in polymers by 1H NMR imaging: LCP networks and hydrogels by M Knörgen; K.-F Arndt; S Richter; D Kuckling; H Schneider is a Chemistry article available to read on EtoBox.

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The kinetics of diffusion in polymers ranges from simple Fickian diffusion to higher-order diffusion, such as Case II diffusion. The conventional method for determining the characteristics of the diffusion of solvents into polymer matrices is by measuring the mass uptake of the polymer while the solvent penetrates the matrix. However, since such measurements perform observations at a macroscopic level, little information has been obtained relating to the properties of the solvent inside the polymer matrix and the mechanisms of the processes that control the diffusion. Nuclear magnetic resonance (NMR) imaging (MRI) is used to monitor the transport of solvents into solid systems in real-time. The method provides a one-or moredimensional image of the density and the mobility of the solvent in a material. Furthermore, the mobility of network chains itself changes due to the softening influence of the solvent. The former (imaging of the solvent) can be used for a quantitative measurement of the diffusion coefficient whereas the observation of the network gives information about changes in the network properties (mobility, decrystallization) during the swelling process. The potential app

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Author

M Knörgen; K.-F Arndt; S Richter; D Kuckling; H Schneider

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0022-2860)

Published

2000

Language

EN

Field

Chemistry (Physical Sciences)