Year: 2020
Type: article
Abstract: PDLCs composite materials (Polymer Dispersed Liquid Crystal) were elaborated by polymerization induced phase separation under UV-light. Binary systems composed of Tripropyleneglycol diacrylate (TPGDA) monomer and a liquid crystal mixture (E7) were used as starting materials in the process of polymerization/crosslinking leading to a phase separation between polymer and liquid crystal. The time behaviour of the optical transmission of these films was experimentally studied during the period of exposure to UV-light in the absence of external applied fields. The transmission versus time curves of in-situ UV-cured TPGDA/E7 films reveal three regions: A first domain corresponding to a transparent film of the initial TPGDA/E7 mixture before exposure to UV light, a second time domain where the sample exhibits a fast relaxation process just after the beginning of the UV irradiation of the monomer/LC blend and a unusual third domain, characterised by an enhancement of the film transparency at longer relaxation times. This process depends on the conditions of sample preparation and film thickness. In this study, a temperature of a sample has been controlled after, during and before the application of UV light.
Source: Materials Today Proceedings
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $150
OpenAlex ID: W3031547553