| 1. |
- Shtykova, Liubov, et al.
(författare)
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Latex coatings containing antifeedants: formulation, characterization, and application for protection of conifer seedlings against pine weevil feeding.
- 2008
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Ingår i: Progress in organic coatings. - : Elsevier BV. - 0300-9440 .- 1873-331X. ; 63:2, s. 160-166
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Forskningsöversikt (refereegranskat)abstract
- Latex-based coatings for protection of tree seedlings against pest insect feeding are evaluated with respect to surface-, mechanical-, and release properties and antifeedant activity. The latex dispersion Eudragit copolymer (EC) was used to form the coatings, 2,6-di-tert-butyl-4-methylphenol (BHT) and cis-dihydropinidine (Alk) as antifeedants, and a thickener and a alkylglucoside based nonionic surfactant were used as additives to optimize the release- and mechanical properties of coatings. Coating characterization was performed with respect to surface morphology (atomic force microscopy, AFM) and surface wetting (contact angle), as well as to mechanical (tensile stress- and tensile strain at break) properties. Surface smoothness and wettability as well as elasticity increased with addition of the surfactant. The optimized coatings were found to be elastic and water resistant at 3-6 wt.% of BHT and 3 wt.% of surfactant. BHT was released into SDS/water at very low rates. Several formulations of BHT and Alk were efficient in preventing the feeding on conifer bark by a pine insect, Hylobius abietis both in laboratory (no-choice) and in held Q months) tests.
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| 2. |
- Shtykova, Lyuba, 1976, et al.
(författare)
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Adsorption of antifouling booster biocides on metal oxide nanoparticles: Effect of different metal oxides and solvents
- 2009
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Ingår i: Progress in Organic Coatings. - : Elsevier BV. - 0300-9440. ; 64:1, s. 20-26
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Tidskriftsartikel (refereegranskat)abstract
- Controlling the release rate of biocides (antifouling agents) from a paint coating is a key issue for the development of multi-season antifouling marine coatings. One promising approach is the use of nanoparticles onto which biocides are adsorbed to prevent premature depletion of the biocide. Adsorption of one novel (Medetomidine) and six commercially available and widely used antifouling biocides (Chlorothalonile, Dichlofluanid, Diuron, Irgarol, Seanine, Tolylfluanid) onto oxide nanoparticles (Al2O3, CuO, MgO, SiO2, TiO2, ZnO) was investigated by HPLC and NMR in different organic solvents. Large differences in adsorption strength depending on the type of nanoparticle and solvent employed were observed. It was shown that nanoparticles coordinate preferentially with the imidazole moiety of Medetomidine. Independent of the type of particle this interaction was considerably stronger in comparison to the other biocides. However, the interaction strength was strongly dependant on the type of solvent, where the largest strongest interaction was achieved in o-xylene. In addition field tests were performed where a considerable decrease in release rate was displayed from coatings containing Medetomidine adsorbed to nanoparticles compared to coatings containing Medetomidine as single additive.
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| 3. |
- Shtykova, Lyuba, 1976, et al.
(författare)
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Interaction between medetomidine and alkyd resins: NMR and FTIR, investigation of antifouling marine paint model systems
- 2006
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Ingår i: Journal of Applied Polymer Science. - : Wiley. - 1097-4628 .- 0021-8995. ; 99:5, s. 2797-2809
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Tidskriftsartikel (refereegranskat)abstract
- The synthesis and optimization of novel bio-active components is key to the development of antifouling marine coatings. It was recently demonstrated that medetomidine (MM) has perfect antibarnacle behavior along with good ecological properties. To investigate the applicability of MM in self-polishing marine paints, a large set of mixtures of MM with two commercial alkyd resins (ARs) was prepared. The nature and strength of the intermolecular interaction as a function of composition in both the liquid and solid states were studied using NMR and FTIR techniques, respectively. It was found that at low concentrations MM molecules were coordinated to alkyd resin chains by hydrogen bonding. This interaction had a multidentate char acter (i.e., one molecule of MM interacted with several - COOH species of ARs) that resulted in stronger bonding between the two compounds. However, at higher MM concentrations an ionic association between the two compounds began, which at a large MM content resulted in microphase separation. It was noted that the strong interaction between medetomidine and the alkyd resins investigated was a positive factor for the application of these compounds in self-polishing marine paints.
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| 4. |
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| 5. |
- Yegorova, A. Yu, et al.
(författare)
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Effective synthesis of 5-aryl-3-ethylidene-3H-pyrrol-2-ones
- 2006
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Ingår i: Russian Chemical Bulletin. - : Springer Science and Business Media LLC. - 1573-9171 .- 1066-5285. ; 55:4, s. 718-721
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Tidskriftsartikel (refereegranskat)abstract
- Substituted 5-aryl-3-ethylidene-3H-pyrrol-2-ones were synthesized by the reaction of the corresponding 4-aryl-4-oxobutanoic acids with ketones in the presence of aminating agents. The conditions of this reaction were developed with the use of both the conventional condensation technique and microwave activation. The structures of the reaction products were con-firmed by elemental analysis, IR spectroscopy, and 1H NMR spectroscopy.
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