Overcoming oxygen inhibition in UV-curing of acrylate coatings by carbon dioxide inerting: Part II

Studer, Katia; Decker, Christian; Beck, Erich; Schwalm, Reinhold

doi:10.1016/s0300-9440(03)00149-8

Cited by 123 publications

(83 citation statements)

References 7 publications

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“…Curing by photo-initiated radical polymerization of the terminal groups proceeds best under inert atmosphere and agrees with previous reports from Studer et al [18,19]. In Figure 4a, the monomer conversion in N 2 for 5.8 and 11.9 mW/cm 2 are very comparable, while slightly lower for 2.9 mW/cm 2 .…”

Section: Discussionsupporting

confidence: 90%

“…For conversion in air, the difference between 1 and 2.5 wt % is much greater, indicating that oxygen termination is more pronounced when curing is carried out in air atmosphere. This is consistent with observations made by Studer et al [18,19]. Figure 5 shows thickness measurements of AOBAE thin films that are exposed to different pH solutions.…”

Section: Nmrsupporting

confidence: 90%

“…Thus, we believe that in air atmosphere the rate of photolytic generation of radicals from the photo initiator is not fast enough to overcome the rate of new oxygen that is diffusing into the polymer from the atmosphere. There is a number of factors that influence the polymerization, including curing power, the thickness of the polymer film, the temperature and the oxygen levels in the atmosphere [18,19], which should be taken into account and furthered studied.…”

Section: Discussionmentioning

confidence: 99%

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Synthesis, Curing Behavior and Swell Tests of pH-Responsive Coatings from Acryl-Terminated Oligo(β-Amino Esters)

et al. 2018

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Abstract:The ability of acryl-terminated oligo(β-amino esters) (AOBAE) to be coated on fibers and printed electronics without solvents and to be cross-linked to a pH-responsive coatings, makes AOBAE-based coatings a potential type of pH-sensor coating. However, there are currently no reports of AOBAEs used as a pH-responsive coating material in sensor applications. Here we present an investigation of the synthesis, curing behavior and swell tests of AOBAEs. AOBAEs were synthesized from reacting an excess of asymmetric diacrylates with piperazine without the use of any solvents. They were then cross-linked to an insoluble network by UV-curing. Nuclear magnetic resonance (NMR) and Fourier transform infrared (FTIR) spectroscopy were used to characterize the AOBAEs. NMR was used to clarify the irregular structure of the AOBAE. FTIR was used to monitor the effects of UV-curing dose and air exposure on monomer conversion during curing. An interferometric technique was used to monitor the swelling behavior of the coating in response to pH variations. Swell experiments showed that the AOBAE also responded to pH variations after polymerization. Therefore, AOBAE is an interesting class of material with potential use as a pH responsive coating in optical-and printed electronics pH-sensors applications.

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Section: Discussionsupporting

confidence: 90%

Section: Nmrsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

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Synthesis, Curing Behavior and Swell Tests of pH-Responsive Coatings from Acryl-Terminated Oligo(β-Amino Esters)

et al. 2018

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“…To improve the cross-linking by UV radiation, an organic resin, photoinitiator or diluent/monomer is often added. [22][23][24][25][26][27][28][29][30][31] The same effect can be achieved by adding MAA and ZTP to a siloxane sol. 20,21,24,[31][32][33] Coatings cured by UV radiation at room temperature showed better resistance to corrosion of AA7075-T6 under simulated aircraft conditions (so called Harrison's solution) than coatings cured thermally, as shown in our previous study.…”

mentioning

confidence: 81%

Electrochemical and Salt Spray Testing of Hybrid Coatings Based on Si and Zr Deposited on Aluminum and Its Alloys

Rodič

Milošev

2015

J. Electrochem. Soc.

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Hybrid coatings based on Si and Zr were assessed for their protection of aluminum and its alloys 2024-T3 and 7075-T6 against corrosion in 0.5 M NaCl. Coatings were prepared from sol synthesized from mixtures of tetraethyl orthosilicate and 3-methacryloxypropyl trimethoxysilane to which various concentrations of zirconium tetrapropoxide and methacrylic acid were added. Short-and long-term electrochemical behavior was assessed. The degree of protection was dependent on the sol composition, ageing time and curing temperature. A coating containing Zr/Si ratio of 0.41, aged for 48 h and cured at 100 • C exhibited the best combination of resistance towards general and localized corrosion. Electrochemical parameters obtained under polarization (corrosion current density of 4.4 nA/cm 2 and stability up to 7 V), and under open circuit conditions (impedance in the few tens of Mohm cm 2 after one week immersion) prove that the protection was high. At other conditions, such as higher Zr/Si ratios, shorter ageing time or curing at room temperature, protection was excellent early after immersion but then lessened rapidly. Coatings prepared under optimal conditions provided a high degree of protection over 500 hours salt spray testing, especially on aluminum metal. These coatings have the potential to provide good protection in chloride environments. While aluminum has good corrosion resistance in seawater, its high-strength alloys in the 2xxx (Al-Cu-Mg) and 7xxx series (Al-ZnMg) are normally not recommended for use under these conditions. 1,2Since there is an ongoing need for light-weight, high-strength materials, the possibility of using alloys other than those of the series 5xxx (Al-Mg-Mn) and 6xxx (Al-Mg-Si) normally recommended for sea-coast applications has to be considered. 2,3Aluminum and its alloys are highly susceptible to oxidation, resulting in the passivation of the surface by a 0.01 to 10 μm thick oxide layer when exposed to air. This naturally formed oxide protects aluminum under atmospheric conditions.2 Passivation of the alloys is, however, less effective. Due to the presence of unevenly distributed intermetallic particles (IMPs), the passive film is, overall, thinner and less uniform. IMPs such as Al 2 CuMg, Al-Cu-Mn-Fe, Al 2 Cu, Al 3 Fe, MgSi 2 , MgZn 2 , create local galvanic cells that promote corrosion on the surface. [4][5][6] Al 2 O 3 is a good insulator but, when containing IMPs, is a semiconductor that allows limited passage of electrons.2 High concentrations of chloride ions allows localized breakdown of the aluminum oxide film, most commonly observed as pitting, crevice or galvanic corrosion.Al alloys have been protected for decades using chromate conversion coatings. In the last decade these coatings have been widely prohibited within 7 and outside 8 the EU due to the fact that hexavalent chromium is a toxic, carcinogenic and environmentally hazardous compound.9-11 Other environmentally hazardous compounds, such as volatile organic compounds (VOCs) used, for example, in the painting industry, have ...

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“…In the process of photo-polymerization, the content of the photo initiator would determine the curing degree of the 1 polymer [3] . Besides, the presence of radical scavengers, the reactivity and viscosity of the oligomer, he wavelength and intensity of the UV radiation all could affect the performance of the UV curing film [4] .…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of UV Curable Complex System Based on Vinyl Resin and Polyurethane Acrylate Prepolymer

Zhao¹,

Sun²,

Xiao³

2017

Proceedings of the 2017 2nd International Conference on Materials Science, Machinery and Energy Engineering (MSMEE 2017)

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A UV curable complex system with vinyl resin and polyurethane acrylate photo-polymerization was investigated. The UV curing process of complex system was traced by IR. Thermal decomposition temperature of UV cured film for various system were determined by thermogravimetric analysis(TGA). And physical properties of those curing films were analyzed and compared. The results show The results show the thermal decomposition temperature, and alkali resistance and hardness of the product gradually decreased with the increase in the proportion of polyurethane acrylic prepolymer.The vinyl resin pre polymer were synthesized by epoxy resin E-51 and acrylic acid.The polyurethane pre polymer was prepared by the reaction of polyether -1000 and TDI-80 with hydroxyethyl ester as the end capping agent. The two kinds of products were mixed in different proportions, and the vinyl resin was modified by polyurethane. Finally, diluent and photo initiator were added to the UV curing of products. The results showed that the vinyl resin and polyurethane prepolymer were successfully prepared. The properties of the products were evaluated by IR, TGA and other methods. The alkali resistance and hardness of curing films have been tested.

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Overcoming oxygen inhibition in UV-curing of acrylate coatings by carbon dioxide inerting: Part II

Cited by 123 publications

References 7 publications

Synthesis, Curing Behavior and Swell Tests of pH-Responsive Coatings from Acryl-Terminated Oligo(β-Amino Esters)

Synthesis, Curing Behavior and Swell Tests of pH-Responsive Coatings from Acryl-Terminated Oligo(β-Amino Esters)

Electrochemical and Salt Spray Testing of Hybrid Coatings Based on Si and Zr Deposited on Aluminum and Its Alloys

Preparation and Characterization of UV Curable Complex System Based on Vinyl Resin and Polyurethane Acrylate Prepolymer

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