The influence of the weight ratio of a castor oil modified epoxy resin (CE) and an epoxidiacrylate resin (EDA) on photocrosslinking and properties of the coatings containing these resins, hexandioldiacrylate monomer (HDDA) and photoinitiator Darocur 1173 (D.1173) upon UV‐exposure have been studied. The variation of acrylate groups during the photoinitiated polymerization was evaluated by FTIR analysis. The crosslinking of the UV‐cured coatings was proved by gel fraction and swelling degree determinations. In addition, some of the properties of the UV‐cured coatings such as relative hardness, flexibility, impact resistance, adhesion onto steel plates and gloss have also been examined. It was shown that the increase of the CE/EDA ratio from 10/40 to 40/10 in investigated coatings led to the decrease of the conversion rate of acrylate groups, and significantly changed some properties of the cured coatings after 14.4 s of UV irradiation: Decrease of gel fraction from 96 to 61 %, but improved the flexibility from 10 to 3 mm, impact resistance from 40 to 140 kG.cm, adhesion from 5 to 2 points. The gloss of the coatings remained to be 100 % in all cases. Long hydrocarbon chains of castor oil residue in CE, lower reactivity of double bonds and radicals formed in the chains compared with those of acrylate groups have been attributed to the obtained relationship between the CE/EDA ratio and photocrosslinking, properties of the cured coatings.
The influences of the triarylsulfonium hexafluoroantimonate salts (TAS) content in the range from 1 to 9 % of the total resin and monomer weight on photocrosslinking and properties of UV-cured coatings based on epoxy diacrylate (EDA), hexanediol diacrylate (HDDA), epoxy resin modified by castor oil (CE) and 3,4-epoxycyclohexyl-methyl 3,4epoxycyclohexane carboxylate, a biscycloaliphatic diepoxide (BCDE), have been studied. It was shown that under UVexposure, photoinitiated radical polymerization of acrylate groups of EDA, HDDA and cationic polymerization of epoxy groups of CE, BCDE occurred very fast, leading to formation of interpenetrating polymer networks. The relationship between TAS content and polymerization of epoxy, acrylate groups as well as performance of UV-cured coatings had optimal particularity with highest conversion rate of the groups and properties of the cured coatings containing 5 and 7 % of TAS.
In this study, new types of gel polymer blend electrolytes (GPBEs) were prepared with the synthesized PVC-g-PMMA graft copolymer, PMMA, plasticizers (propylene carbonate (PC), dioctyl phthalate (DOP)), and different loadings of Mg(ClO4)2 via the solution casting method using tetrahydrofuran as solvent. Fourier transform infrared (FTIR) spectra of the electrolytes showed mutual molecular interactions between Mg(ClO4)2 and organic moieties. The scanning electron microscopy images of the GPBEs showed their wrinkled surface morphology due to their low elastic modulus and high flexibility. Energy-dispersive X-ray (EDX) spectroscopy and mapping technique revealed the regular distributions of all atomic elements such as Cl, Mg, O, and C in the doped GPBEs. With increasing the Mg salt concentration, Young’s modulus and tensile strength of the GPBEs strongly decreased. Interestingly, the elongation at break of the GPBEs was higher than that of neat (undoped) GPBE and achieved the highest value of 215% at the salt content of 20 wt.%. The AC conductivity and ionic conductivity, as well as dielectric permittivity of plasticized PMMA/PVC-g-PMMA/Mg(ClO4)2 GPBE,s increased with frequency and Mg(ClO4)2 doping content. Ionic conductivity of the doped GPBEs can be achieved from
5.51
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10
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5
to
4.42
×
10
−
4
(S.cm-1) using Mg(ClO4)2 contents in the range from 10 to 40 wt.%. The doped GPBEs are thermally stable up to 100°C with very low weight losses. The GPBE doped with 20 wt.% of Mg(ClO4)2 can be used as a new type of electrolyte for developing Mg batteries.
The effects of Seanine 211 content rate on Cu releasing as well as coating properties were investigated. The process of releasing Cu has been studied in dynamic conditions with Seanine content of 0, 3, 5, 10 % and static conditions using Seanine content of 5 % (in weight). Under dynamic conditions, the Cu shall release at high speed in the first 2 days of the test, then remain stable and proportional to the time according to the linear‐line equation, maintained at ≈ 3.5 μg/cm2/day. Under static conditions, the process of Cu releasing is studied through the reduction of coating thickness, the results show that the coating abrasion rate is also proportional to the time and according to linear‐line equation. With the content of 20 % Cu2O (in proportion) and 5 % Seanine (in proportion), the coat has the following properties: relative hardness 0.5; impact resistance 65 Kg.cm; flexural strength 1 mm; adhesion cross cut at 1.
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