Photochemistry of Bis-Methacrylic Polymers and Alignment of Liquid Crystals

Kyrychenko, V.; Smolyakov, Georges; Zagniy, V. V.; Vretik, L. O.; Paskal, L.; Syromyatnikov, V. G.; Yaroshchuk, O.

doi:10.1080/15421400802451873

Cited by 14 publications

(8 citation statements)

References 12 publications

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“…At the same time, spectra recorded by FTIR spectroscopy detected chain scission had a greater contribution to epoxy degradation [62]. According to the literature there exist two types of products which the phenoxy radical may generate during the photodegradation process through the photo-Fries rearrangements [63]. In a first instance there is the possibility of the phenoxy radical to generate phenol via extraction of a hydrogen atom from vicinal entities.…”

Section: Resultsmentioning

confidence: 98%

UV-light-induced curing of branched epoxy novolac resin for coatings

Gaidukovs¹,

Medvids²,

Onufrijevs³

et al. 2018

Express Polym. Lett.

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Usually, the processing technology of the thermoset polymers is characterized by the use of the two component formulations, which generally consist of a polymer resin and a hardener. These two component polymer formulations need to be hardened for almost 12 hours at room temperature [1, 2]. Generally, extra heating at 60-160°C is necessary to facilitate the hardening process [3]. The conventional curing process has several relevant disadvantages. Firstly, as the prerequisite condition for acceptable final properties of the produced material, the following thermal treatment is always desirable as a post-curing process [4]. Secondly, there are difficulties with producing large monolith constructions and coating large surfaces that can be sensitive to heating and/or when heating is even impossible [5]. For example, the repair service protective coatings applications for ships in the maritime industry, and for power generators in the energy generation sector [6]. The market of ultraviolet (UV) curable polymers is growing very rapidly, especially in the last decades [7]. This market is anticipated to grow by 7.0% from 2013 to 2019 and is expected to reach USD 7.930

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Section: Resultsmentioning

confidence: 98%

UV-light-induced curing of branched epoxy novolac resin for coatings

Gaidukovs¹,

Medvids²,

Onufrijevs³

et al. 2018

Express Polym. Lett.

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show abstract

“…its ''perpendicular'' alignment at long-term exposure, can be explained by the photo-destruction clearly detected in this polymer, 63 which commonly supports ''perpendicular'' LC alignment. 73 The result for P4 suggests that a ''parallel'' alignment can also be obtained for polymers with direct cinnamate species if they are attached to a backbone through the spacer with mesogenic structure.…”

Section: Influence Of Photoaligning Materials Structure On Characteri...mentioning

confidence: 99%

“…5f). 73 The listed reactions do not exhaust the whole variety of types of photochemical reactions leading to photoalignment. For example, spiropyrans, which demonstrate good photoalignment effect, undergo ring opening/closure of their [4 + 2] p-electronic system.…”

Section: Basic Photoaligning Materialsmentioning

confidence: 99%

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Photoalignment of liquid crystals: basics and current trends

2012

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“…Diazodye M1 gives alignment sensitive to visible light, 4 while polymer M2 shows alignment of poor thermal stability. 8 Both materials were dissolved in dimethylformamide at a concentration of 1 wt %. The filtered solutions were spin coated on indium tin oxide covered glass substrates preliminarily washed and treated in an ozone treatment machine.…”

mentioning

confidence: 99%