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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 12 — Jun. 9, 2008
  • pp: 8487–8497

Method for characterization of diffusion properties of photopolymerisable systems

Tzwetanka Babeva, Izabela Naydenova, Suzanne Martin, and Vincent Toal  »View Author Affiliations

Optics Express, Vol. 16, Issue 12, pp. 8487-8497 (2008)

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A novel approach for measuring the diffusion coefficients in photopolymerisable materials is proposed. The method is based on studying the evolution of the surface relief profile in a single illuminated spot using an interferometric surface profiler. It is shown that the observed post-exposure swelling in the illuminated spot is due to mass-transport of monomer from the unexposed to the exposed area driven by a monomer concentration gradient set up by the monomer polymerization in the exposed area. Appropriate choice of the thickness of the studied layers ensures both lateral movement of monomer and negligible contribution from the depth. The diffusion coefficient is retrieved from the standard one-dimensional diffusion equation where the height of the profile in the center of the illuminated spot is used instead of the monomer concentration. In contrast to other techniques for measuring the diffusion in photopolymerisable materials, no assumptions or preliminary information about the polymerization rates are required. It is shown how the method can be used for studying the intensity and polymer density dependence of diffusion coefficient.

© 2008 Optical Society of America

OCIS Codes
(090.0090) Holography : Holography
(120.6650) Instrumentation, measurement, and metrology : Surface measurements, figure
(160.5470) Materials : Polymers
(180.3170) Microscopy : Interference microscopy
(290.1990) Scattering : Diffusion

ToC Category:

Original Manuscript: March 13, 2008
Revised Manuscript: May 22, 2008
Manuscript Accepted: May 22, 2008
Published: May 27, 2008

Tzwetanka Babeva, Izabela Naydenova, Suzanne Martin, and Vincent Toal, "Method for characterization of diffusion properties of photopolymerisable systems," Opt. Express 16, 8487-8497 (2008)

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