scholarly journals Cationic UV-Curing of Epoxidized Biobased Resins

Polymers ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 89
Author(s):  
Camilla Noè ◽  
Minna Hakkarainen ◽  
Marco Sangermano
Keyword(s):  
Mechanical Properties ◽  
Organic Compound ◽  
Epoxy Resins ◽  
Chemical Resistance ◽  
State Of The Art ◽  
Uv Curing ◽  
Building Blocks ◽  
Uv Curable ◽  
Curing Conditions ◽  
Volatile Organic

Epoxy resins are among the most important building blocks for fabrication of thermosets for many different applications thanks to their superior thermo-mechanical properties and chemical resistance. The recent concerns on the environmental problems and the progressive depletion of petroleum feedstocks have drawn the research interest in finding biobased alternatives. Many curing techniques can be used to obtain the final crosslinked thermoset networks. The UV-curing technology can be considered the most environmentally friendly because of the absence of volatile organic compound (VOC) emissions and mild curing conditions. This review provides an overview of the state of the art of bio-based cationic UV-curable epoxy resins. Particular focus has been given to the sources of the bio-based epoxy monomers and the applications of the obtained products.

scholarly journals Nanoarchitectonics for Hierarchical Fullerene Nanomaterials

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 2146
Author(s):  
Subrata Maji ◽  
Lok Kumar Shrestha ◽  
Katsuhiko Ariga
Keyword(s):  
Organic Compound ◽  
Volatile Organic Compound ◽  
Hierarchical Structures ◽  
Functional Materials ◽  
Building Blocks ◽  
Review Article ◽  
Structural Motifs ◽  
Fullerenes C60 And C70 ◽  
Volatile Organic

Nanoarchitectonics is a universal concept to fabricate functional materials from nanoscale building units. Based on this concept, fabrications of functional materials with hierarchical structural motifs from simple nano units of fullerenes (C60 and C70 molecules) are described in this review article. Because fullerenes can be regarded as simple and fundamental building blocks with mono-elemental and zero-dimensional natures, these demonstrations for hierarchical functional structures impress the high capability of the nanoarchitectonics approaches. In fact, various hierarchical structures such as cubes with nanorods, hole-in-cube assemblies, face-selectively etched assemblies, and microstructures with mesoporous frameworks are fabricated by easy fabrication protocols. The fabricated fullerene assemblies have been used for various applications including volatile organic compound sensing, microparticle catching, supercapacitors, and photoluminescence systems.

Local Dissipative Processes in the Epoxy Component

2021 ◽  
Vol 899 ◽  
pp. 688-693
Author(s):  
Viktor A. Lomovskoy ◽  
Anna S. Shorshina ◽  
Igor D. Simonov-Emelyanov ◽  
Anastasia A. Razzhivina
Keyword(s):  
Mechanical Properties ◽  
Dielectric Properties ◽  
Epoxy Resins ◽  
Chemical Resistance ◽  
Physical And Mechanical Properties ◽  
Dissipative Processes ◽  
High Adhesion

It is known that epoxy resins (ES) and materials based on them are widely used in various areas of natural economy due to their valuable properties: low shrinkage during curing, high adhesion to various materials, chemical resistance, good physical and mechanical properties, and excellent dielectric properties [1].

scholarly journals Preparation and Performance of a Waterborne UV/Al Low Infrared Emissivity Coating

2020 ◽  
Vol 10 (18) ◽  
pp. 6423 ◽  
Author(s):  
Xiaoxing Yan ◽  
Lin Wang
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Orthogonal Experiment ◽  
Uv Curing ◽  
Infrared Emissivity ◽  
Nano Silica ◽  
Uv Curable ◽  
Powder Concentration ◽  
Al Powder ◽  
Silica Slurry

An Al powder filler, nano silica slurry and KH560 were mixed with a prepared waterborne UV-curable coating, and the coating was optimized by an orthogonal experiment. Influences of the Al powder concentration on the gloss, infrared emissivity, brightness, mechanical properties, corrosion resistance and other related properties of the coating were further discussed. The results show that the influence of the Al powder concentration on the gloss was more significant, followed by the UV curing time and nano silica slurry concentration. After studying the key role of the concentration of the Al powder, we found that as the concentration of the Al powder is augmented from 10.0% to 25.0%, the gloss lessened from 19.1% to 8.5%. As the concentration of the Al powder was augmented from 10.0% to 40.0%, the infrared emissivity lessened from 0.649 to 0.083 and the brightness L’ value of the coating was step-by-step augmented and inclined to be stable; in addition, the coating’s mechanical properties reached an excellent level. The coating containing 25.0% Al powder had the best corrosion resistance, surface morphology and comprehensive properties, which can potentially be used for infrared stealth technology.

Preparation and Characterization of UV Curable Hybrid System Based on Free Radical and Cationic Mechanism

2013 ◽  
Vol 470 ◽  
pp. 141-145 ◽  
Author(s):  
Li Juan Zhang ◽  
Chen Bo Wu ◽  
Fei Yang ◽  
Xiao Yi Geng ◽  
Meng Qian Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Free Radical ◽  
Hybrid System ◽  
Epoxy Group ◽  
Physical And Mechanical Properties ◽  
Uv Curing ◽  
Decomposition Temperature ◽  
Scanning Calorimetry ◽  
Uv Curable ◽  
Low Viscosity

A UV curable hybrid system with a dual mechanism of radical and cationic photo-polymerization, was investigated. A kind of free radical oligomer with low viscosity named hexahydrophthalic acid diglycidyl acrylate was first synthesized. The structure of the oligomer was characterization by FTIR. The UV curing processing of hybrid system was traced by real-time FTIR, and compared with free radical, cationic system. Thermal decomposition temperature and glass transition temperature of UV curing film for various system were determined by thermogravimetric analysis (TGA) and differental scanning calorimetry (DSC), respectively. And physical and mechanical properties of those curing films were analyzed and compared. The results show that the radical polymerization of double bond and cationic polymerization of epoxy group could occur simultaneously in hybrid system. The conversion rate of epoxy group for hybrid system was higher than that of epoxy group for cationic system, which demonstrated that the cationic photo-initiator (DPI·PF6) can be sensitized by the free radical photo-initiator (Irgacure 184). Compared with free radical and cationic system, the hardness and mechanical properties of hybrid system curing film were better than those of the cationic system curing film, while closed to those of free radical system.

scholarly journals Modified halloysite as a filler for epoxy resins

2011 ◽  
Vol 13 (3) ◽  
pp. 47-52 ◽  
Author(s):  
Izabella Legocka ◽  
Ewa Wierzbicka ◽  
Talal Al-Zahari ◽  
Osazuwa Osawaru
Keyword(s):  
Mechanical Properties ◽  
Organic Compound ◽  
Chemical Modification ◽  
Epoxy Resins ◽  
Ultrasound Treatment ◽  
Hybrid Filler ◽  
Interphase Interaction

Modified halloysite as a filler for epoxy resins The modification methods of halloysite and further applications of the modified mineral as a filler for epoxy resins have been presented. The advantage of ultrasound treatment prior to chemical modification with an organic compound in order to obtain a hybrid filler was confirmed. The analysis of the composites obtained with the use of the modified halloysite (3-5 wt.% range) as a filler for epoxy resins indicates an improved interphase interaction and mechanical properties in comparison to the composites based on neat halloysite.

scholarly journals Properties and role of interfaces in multimaterial 3D printed composites

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Laura Zorzetto ◽  
Luca Andena ◽  
Francesco Briatico-Vangosa ◽  
Lorenzo De Noni ◽  
Jean-Michel Thomassin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Uv Light ◽  
Finite Size ◽  
Uv Curing ◽  
Building Blocks ◽  
Layer By Layer ◽  
Bimaterial Interfaces ◽  
3D Printed ◽  
Architectured Materials ◽  
The Impact

AbstractIn polyjet printing photopolymer droplets are deposited on a build tray, leveled off by a roller and cured by UV light. This technique is attractive to fabricate heterogeneous architectures combining compliant and stiff constituents. Considering the layer-by-layer nature, interfaces between different photopolymers can be formed either before or after UV curing. We analyzed the properties of interfaces in 3D printed composites combining experiments with computer simulations. To investigate photopolymer blending, we characterized the mechanical properties of the so-called digital materials, obtained by mixing compliant and stiff voxels according to different volume fractions. We then used nanoindentation to measure the spatial variation in mechanical properties across bimaterial interfaces at the micrometer level. Finally, to characterize the impact of finite-size interfaces, we fabricated and tested composites having compliant and stiff layers alternating along different directions. We found that interfaces formed by deposition after curing were sharp whereas those formed before curing showed blending of the two materials over a length scale bigger than individual droplet size. We found structural and functional differences of the layered composites depending on the printing orientation and corresponding interface characteristics, which influenced deformation mechanisms. With the wide dissemination of 3D printing techniques, our results should be considered in the development of architectured materials with tailored interfaces between building blocks.

Pilot plant plasma-catalytic system for the decomposition of a volatile organic compound

2016 ◽  
Vol 15 (3) ◽  
pp. 251-259
Author(s):  
Shreedhar Devkota ◽  
◽  
Jin Oh Jo ◽  
Dong Lyong Jang ◽  
Young Jin Hyun ◽  
...  
Keyword(s):  
Organic Compound ◽  
Catalytic System ◽  
Volatile Organic Compound ◽  
Pilot Plant ◽  
Volatile Organic
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