Determination of the polymerisation rate of a low-toxicity diacetone acrylamide-based holographic photopolymer using Raman spectroscopy

Abstract

. (2016). Determination of the polymerisation rate of a low-toxicity diacetone acrylamidebased holographic photopolymer using Raman spectroscopy. Optical Materials, vol. 48, Oct. 2015, pp. 12-17. doi.org/10.1016/ j.optmat.2015 Determination of the polymerisation rate of a low-toxicity diacetone acrylamide-based holographic photopolymer using Raman spectroscopy t r a c tThe polymerisation rate of a low-toxicity Diacetone Acrylamide (DA)-based photopolymer has been measured for the first time using Raman spectroscopy. A value for the polymerisation rate of 0.020 s À1 has been obtained for the DA photopolymer by modelling the polymerisation reaction dynamics as a stretched exponential or Kohlrausch decay function. This is significantly lower than the polymerisation rate of 0.100 s À1 measured for the well known Acrylamide (AA)-based photopolymer composition. The effect of the additive glycerol on the polymerisation rate of the DA-based photopolymer has also been investigated. The inclusion of glycerol is observed to increase the rate of polymerisation of the DA photopolymer by up to 60%. It is also observed that the polymerisation rate of the DA photopolymer is less dependent on the recording intensity when glycerol is present.

Low-Toxicity Photopolymer for Reflection Holography

“…Here, an investigation into the influence of two chemical components on the holographic recording ability of a DA-based photopolymer in the reflection regime of recording is reported: citric acid which acts as a CTA and glycerol which acts as a free radical scavenger (FRS). ,− The CTA restricts the growth of long polymer chains within the bright fringes during holographic recording by termination of a growing polymer chain and transfer of the free radical so that it can initiate a new polymer chain. This restriction of chain length is beneficial for obtaining high spatial resolution of the material required for obtaining high diffraction efficiency reflection holograms.…”

Diethoxycarbonyl-BODIPYs as heavy-atom-free photosensitizers for holographic recording in cellulose acetate photopolymer

“…The polymerization of acrylamide and N , N ′-methylenebisacrylamide in the CA–PEG materials under 532 nm excitation was confirmed by using Raman microspectroscopy, which has been previously used to study photopolymerization of these monomers. 55 The reaction progress was monitored by changes in the characteristic vibrational peaks at 1600 cm −1 and 1623 cm −1 , which correspond to the CC double bonds of acrylamide and methylenebisacrylamide, respectively. The spectrometer is equipped with both 785 nm and 532 nm lasers as options for Raman source (Fig.…”

LED-Cured Reflection Gratings Stored in an Acrylate-Based Photopolymer

“…Taking into account these DE values reported in other works, the DE max of 14.1% (experimental value) obtained in this paper represents an excellent result. Higher DE max values could be achieved by decreasing the spatial frequency and adding CTAs and free radical scavenger in the photopolymer composition as shown in the references [40,47,48]. Hence, more studies are necessary in order to optimize the reflection holograms stored in our acrylate-based photopolymer and improve their performance.…”