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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 50,
  • Issue 11,
  • pp. 1339-1344
  • (1996)

In Situ Diffusion Studies Using Spatially Resolved Infrared Microspectroscopy

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Abstract

Spatially resolved infrared microspectroscopy is used in conjunction with the contact method to conduct <i>in situ</i> diffusion experiments of photocured polymer-dispersed liquid crystals (LCs). The system analyzed consists of a low-molecular-weight liquid crystal (E7) diffusing into a photopolymerizable monomer (NOA65). The measured concentration profiles were generated by monitoring the hydroxyl band of the monomer as a function of time and spatial position. The diffusion coefficients were calculated from least-squares fitting of the data. The system followed Fick's second law of diffusion. The diffusion coefficient for this system is (1.97 ± 0.2)(10<sup>-8</sup>) cm<sup>2</sup>/s. The morphology of the system after polymerization exhibited three distinct regions: nematic LC molecularly mixed in the cross-linked network of the polymer, nematic LC droplet gradient in the polymer matrix, and polymer fibers scattered in the continuous nematic LC.

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