The Peculiarities of Photopolymerization in the Composite “Pre-polymer–TiO₂Nanoparticles”

Abstract

The photo-conversion of pre-polymer mixture NOA65 (Norland, USA) doped with TiO 2 nanoparticles is studied by the method of dielectric spectroscopy. The photopolymerized composites show low frequency relaxation and ion conductivity typical for liquids. This is explained by the reaction of TiO 2 particles with components of NOA65 mixture that blocks photopolymerization of pre-polymer and increases concentration of ion carriers. In addition, strong photochromism of NOA65-TiO 2 composites is observed which makes this system quite attractive for non-linear optics and associated applications. It may be caused by formation of titanium mercaptide and its transfer from IV to III valency state under UV irradiation.

Polymer-dispersed liquid crystal nanocomposites comprising montmorillonite clay modified by conducting pentamerous oligoaniline

“…The electro-optical characteristics are conducive to a variety of PDLC-based applications, such as switchable windows, [6][7][8] display devices, [9][10][11][12][13] and optical devices. [14][15][16][17][18] Recently, materials scientists have begun to investigate to what extent nanoparticles (NPs) can be hybridized with materials, including a metal, 19 a metal oxide, [20][21][22] a semiconductor, 23 and an inorganic layered material, [24][25][26][27] in PDLC films to affect the optoelectronic properties. The research goal of these investigations is primarily to improve the contrast ratio and reduce the driving voltage for optimization in industrial applications.…”

Study of Optical Properties for (PVA-PEG-ZnO) Nanocomposites

“…In these materials there is the possibility to combine mechanical, electric and optical properties of constituent components in one sample. From optical point of view, several fascinating properties of these composites can be obtained [1]. Generally, the use of most polymers was limited to the manufacture of cheap products which were used for simple purposes.…”