Investigation Of Memory Effect In Dichroic Dyes Based PDLC Films

Torgova, S. I.; Dorozhkina, Galina N.; Novoseletskii, Nikolai V.; Umanskiĭ, B. A.

doi:10.1080/15421400490432308

Cited by 2 publications

(1 citation statement)

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“…Therefore, the electro-optical response of PDLC films is greatly influenced not only by the polymerization conditions but also by the molecular structure of the monomers used to be incorporated as a polymeric matrix [25][26][27]. Moreover, the results obtained here for the permanent memory effect are higher than any reported in the literature, to our knowledge [10,14,28,29].…”

Section: Resultsmentioning

confidence: 58%

The Impact of Curing Temperature and UV Light Intensity on the Performance of Polymer-Dispersed Liquid Crystal Devices Exhibiting a Permanent Memory Effect

Mouquinho,

Sotomayor

2024

Crystals

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PDLC films, synthesized via polymerization-induced phase separation (PIPS) utilizing both temperature and UV monochromatic radiation, were derived from a blend of E7 nematic liquid crystal (LC) and PolyEGDMA875 (polyethyleneglycoldimethacrylate) oligomers, serving as the precursor for the polymeric matrix. The influence of the curing temperature on thermal polymerization, UV light intensity on photochemical polymerization, and exposure time during these processes on the electro-optical characteristics of PDLC films was thoroughly examined. Observations revealed that employing thermal polymerization during device preparation notably enhanced the permanent memory effect of the PDLC films. Sustained high transparency (TOFF = 45%) over an extended duration at room temperature, even subsequent to voltage cessation, was achieved. This transition initiated from an opaque state (T0 = 0%) through to a transparent state (TMAX = 65%), resulting in a substantial 70% permanent memory effect.

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