Investigation of polymerization rate in an acrylamide-based photopolymer using Raman spectroscopy

Raghavendra Jallapuram; Izabela Naydenova; Hugh J. Byrne; Suzanne Martin; Robert G. Howard; Vincent Toal

doi:10.1117/12.605416

3 June 2005 Investigation of polymerization rate in an acrylamide-based photopolymer using Raman spectroscopy

Raghavendra Jallapuram, Izabela Naydenova, Hugh J. Byrne, Suzanne Martin, Robert G. Howard, Vincent Toal

Proceedings Volume 5826, Opto-Ireland 2005: Optical Sensing and Spectroscopy; (2005) https://doi.org/10.1117/12.605416
Event: OPTO-Ireland, 2005, Dublin, Ireland

Abstract

Diffusion models predict that polymerization and diffusion rates are the key factors that control the dynamics and the final properties of a holographic grating recorded in a photopolymerizable material. Diffusion rates during the initial phase of the holographic recording have already been studied and reported. We now report the investigation of the polymerization rate in an acrylamide-based photopolymer using Raman spectroscopy. The polymerization rate constant was estimated by monitoring the intensity of the characteristic Raman peaks at 1284 cm^-1 corresponding to the bending mode of CH vinyl bond in acrylamide and 1609 cm^-1 corresponding to the carbon-carbon double bond (C=C) in acrylamide as a function of illumination time. The dependence of the residual monomer concentration on the exposure time was fitted using a mono exponential fitting function. The value of the polymerization constant was estimated to be 0.043 s^-1(mW/cm²)-0.5 for this formulation. A comparison with some other photopolymer systems reported in the literature reveals that the acrylamide-based photopolymer system is characterized by a relatively fast polymerization rate constant. The results from the present study give significant information for better understanding of the process of holographic recording in acrylamide-based photopolymer system.

Citation Download Citation

Raghavendra Jallapuram, Izabela Naydenova, Hugh J. Byrne, Suzanne Martin, Robert G. Howard, and Vincent Toal "Investigation of polymerization rate in an acrylamide-based photopolymer using Raman spectroscopy", Proc. SPIE 5826, Opto-Ireland 2005: Optical Sensing and Spectroscopy, (3 June 2005); https://doi.org/10.1117/12.605416

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