The holographic properties of photopolymers on the base of oxygen- and sulfur-containing spirocyclic monomers

The influence of the oxygen and sulfur atoms in the spirocycles (–O–CH 2 –CH 2 –O–, –O–CH 2 –CH 2 –S–, –S–CH 2 –CH 2 –S–) of the spirocyclic acryloylpiperidonyl monomers on the thermomechanical and holographic properties of the photopolymer material was studied. The conversion of double bonds of monomers during UV polymerization was determined by IR spectroscopy method. The refractive indices of spirocyclic monomers and photopolymers were measured. The phase transmission diffraction gratings were recorded in photopolymer materials containing the spirocyclic monomers. The highest modulation of the refractive index was observed in the photopolymer based on the acryloylpiperidonyl dithiaazaspiroheterocyclic (–S–CH 2 –CH 2 –S–) monomer. It was shown that light scattering in the photopolymer at hologram recording has noticeable negative contribution and for the decrease in the diffraction efficiency of holograms. The phase incompatibility of the polymer matrix and formed photopolymer is considered as the reason of the light-scattering growth. Graphical Abstract