Study on Microstructure and Properties of the UV Curing Acrylic Epoxy/SiO2 Nanocomposite Coating

This study is aimed at exploring the effects of SiO2 nanoparticles on the crosslinking and mechanical and thermal properties of UV curing acrylic epoxy coating. The curing polymerization process and thermal and mechanical properties of UV-curable acrylate epoxy system have been evaluated with or without the presence of SiO2 nanoparticles. To fabricate the UV curing acrylic epoxy/SiO2 nanocomposite coating, nano-SiO2 particles (0.5–5 wt.% by weight of resin) were added in the photo-curable system using sonication for 3 h. Various techniques for characterization have been used, such as FESEM (field emission scanning electron microscope), FTIR (Fourier-transform infrared spectroscopy), TGA (thermogravimetry analysis), gel fraction, and swelling degree analyses. FESEM data indicated that at the content of 2.5 wt.%, nanosilica was homogeneously dispersed in the coating procedure. However, once added 5 wt.%, large aggregation portions were found inside the coating matrices. Surprisingly, nano-SiO2 could play dual roles, as both UV absorbers and nanoreinforcers, in this nanocomposite coating. Besides, data from FTIR, gel fraction, and swelling degree analyses confirmed the role of SiO2 nanoparticles as UV absorbers that reduced the conversion performance of acrylate double bonds, thus increased slightly the swelling degree of coating. In addition, incorporation of SiO2 nanoparticles (as nanofillers, at content of 2.5 wt.%) in the polymer matrix enhanced significantly the abrasion resistance and thermal stability of the coating, by 60% (from 98.3 to 158.4 lite/mil) and 9°C (from 348°C to 357°C), respectively.

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Polymerization shrinkage by investigation of uv curable dental restorative composites containing multifunctional methacrylates

Polish Journal of Chemical Technology ◽

10.2478/pjct-2013-0027 ◽

2013 ◽

Vol 15 (2) ◽

pp. 81-85 ◽

Cited By ~ 3

Author(s):

Jolanta Świderska ◽

Zbigniew Czech ◽

Agnieszka Kowalczyk

Keyword(s):

Dental Materials ◽

Uv Curing ◽

Triethylene Glycol ◽

Polymerization Process ◽

Dental Composites ◽

Glycol Dimethacrylate ◽

Uv Curable ◽

Radiation Curing ◽

Polymerization Shrinkage ◽

Curing Shrinkage

Typical commercial restorative dental compositions in the form of medical resins contain in-organic fillers, multifunctional methacrylates and photoinitiators. The currently used resins for direct composite restoratives have been mainly based on acrylic chemistry to this day. The main problem with the application and radiation curing process is the shrinkage of photoreactive dental materials during and after UV curing. Shrinkage of restorative radiation curable dental composites is a phenomenon of polymerization shrinkage, typical behavior of multifunctional methacrylates during the polymerization process. The important factors in curing of dental composites are: the kind and concentration of the used methacrylate, its functionality, double bond concentration, the kind and concentration of the added photoinitiator and UV dose emitted by the UV-lamp. They are investigated multifunctional 1,3-butanediol dimethacrylate (1,3-BDDMA), diethylene glycol dimethacrylate (DEGDMA), triethylene glycol dimethacrylate (TEGDMA), trimethylolpropane trimethacrylate (TMPTMA), 2,2-bis-[4-(2-hydroxy-3-methacryxloyloxypropyl) phenyl]propane (Bis-GMA), ethoxylated Bis-GMA (EBPDMA) and dodecandiol dimethacrylate (DDDMA). Reduction of polymerization shrinkage of restorative dental compositions is at the moment a major problem of dental technology. This problem can be solved through an application of photoreactive non-tacky multifunctional methacrylates in the investigated dental adhesive fillings.

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The Synergistic Effects of Sio2 Nanoparticles and Organic Photostabilizers for Enhanced Weathering Resistance of Acrylic Polyurethane Coating

Journal of Composites Science ◽

10.3390/jcs4010023 ◽

2020 ◽

Vol 4 (1) ◽

pp. 23 ◽

Cited By ~ 2

Author(s):

Thien Vuong Nguyen ◽

Tuan Anh Nguyen ◽

Thi Hau Nguyen

Keyword(s):

Synergistic Effects ◽

Sio2 Nanoparticles ◽

Nanocomposite Coating ◽

Polyurethane Coating ◽

Nano Sio2 ◽

Aging Test ◽

Before And After ◽

Acrylic Coatings ◽

Acrylic Polyurethane ◽

Weathering Resistance

This study aims to evaluate the synergical effects of SiO2 nanoparticles (nano-SiO2) and organic photostabilizers (Tinuvin 384 (T384) and Tinuvin 292 (T292)) on the weathering resistance of acrylic polyurethane coating. Data obtained from infrared (IR), field emission scanning electron microscopy (FESEM), and weight loss of coatings (before and after aging test), suggest that the SiO2 nanoparticles play a dual role, as both reinforcer and UV absorber, thus improving effectively both the mechanical properties and the weathering resistance of polyurethane acrylic coatings. The nanocomposite coating containing 2 wt % nano-SiO2, 2 wt % T384, and 1 wt % T292 exhibits excellent weathering and abrasion resistances, offering a durable outdoor application.

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Reducing of on Polymerization Shrinkage by Application of UV Curable Dental Restorative Composites

Polish Journal of Chemical Technology ◽

10.2478/pjct-2014-0050 ◽

2014 ◽

Vol 16 (3) ◽

pp. 51-55 ◽

Cited By ~ 7

Author(s):

Jolanta Świderska ◽

Zbigniew Czech ◽

Waldemar Świderski ◽

Agnieszka Kowalczyk

Keyword(s):

Uv Curing ◽

Polymerization Process ◽

Dental Composites ◽

Tetraethylene Glycol ◽

Curing Process ◽

Glycol Dimethacrylate ◽

Uv Curable ◽

Polymerization Shrinkage ◽

Polyethylene Glycol 200 ◽

Uv Curing Process

Abstract This manuscript describes dental compositions contain in-organic fillers, multifunctional methacrylates and photoinitiators. The main problem by application and UV curing process is the shrinkage of photoreactive dental materials during and after UV curing process. Total shrinkage of UV curable dental composites is a phenomenon of polymerization shrinkage, typical behavior for multifunctional methacrylates during polymerization process. The important factors by curing of dental composites are: kind and concentration of used methacrylates, their functionality, double bond concentration, kind and concentration of added photoinitiator and UV dose. They are investigated UV-curable dental compositions based on 2,2-bis-[4-(2-hydroxy-3-methacryxloyloxypropyl)phenyl]propane (Bis-GMA) and containing such multifunctional monomers as 1,3-butanediol dimethacrylate (1,3-BDDMA), diethylene glycol dimethacrylate (DEGDMA), tetraethylene glycol dimethacrylate (T3EGDMA), trimethylolpropane trimethacrylate (TMPTMA), polyethylene glycol 200 dimethacrylate (PEG200DA). Reduction of polymerization shrinkage of dental compositions is at the moment a major problem by dental technology.

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Effect of Deacetylation on Characterization of pH Stimulus Responsive Chitosan-Acrylamide Hydrogels Using Radiation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.896.292 ◽

2014 ◽

Vol 896 ◽

pp. 292-295 ◽

Cited By ~ 1

Author(s):

Kris Tri Basuki ◽

Deni Swantomo ◽

Sigit ◽

Kartini Megasari

Keyword(s):

Electric Fields ◽

Chemical Sensor ◽

Graft Copolymerization ◽

X Ray Diffraction ◽

Grafting Efficiency ◽

Sensor Material ◽

Swelling Degree ◽

Gel Fraction ◽

Stimulus Responsive ◽

Acetyl Group

Smart hydrogels which can change their swelling behavior and other properties in response to environmental stimuli such as temperature, pH, solvent composition and electric fields, have attracted great interest as chemical sensor material and controlled release system. The pH stimulus responsive hydrogels were synthesized by gamma-irradiation graft copolymerization of chitosan-acrylamide. In this research the influence of deacetylation process on the hydrogels characterization were investigated by measuring grafting efficiency, gel fraction, swelling degree, and crosslink density. Evidence of grafting was confirmed by FTIR spectroscopy. X-ray diffraction showed reduction in the crystallinity of chitosan with different deacetylation process also after the graft copolymerization reaction. The results showed that decreasing acetyl group of chitosan increase the grafting efficiency, gel fraction and swelling degree. While crystallinity decreased. The hydrogels indicated pH-dependent swelling behaviour.

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UV-Curable organic-inorganic hybrid films based on tetraethylorthosilicate oligomer and special acrylated polyester

e-Polymers ◽

10.1515/epoly.2012.12.1.523 ◽

2012 ◽

Vol 12 (1) ◽

Author(s):

Jianyun He ◽

Jinping Xiong ◽

Bingqian Xia

Keyword(s):

Uv Light ◽

Uv Curing ◽

Organic Matrix ◽

Dynamic Mechanical Properties ◽

Hybrid Films ◽

Uv Curable ◽

Inorganic Hybrid ◽

Dynamic Mechanical ◽

H Nmr ◽

Uv Curing Process

AbstractOrganic-inorganic hybrid films were prepared using tetraethylorthosilicate (TEOS) oligomer and special acrylated polyester (SAP) via a UV-curing process. TEOS oligomers were prepared in the presence of water and ethanol using hydrochloric acid as the catalyst and characterized using 1H NMR, 29Si NMR and MALDI-TOF mass spectra. Special acrylated polyester was synthesized by 1,4-cyclohexane dimethanol, neopentyl glycol, 1,4-butanediol, maleic anhydride, adipic acid, and acrylic acid. Hybrid films were cured by UV light and the thermal properties, dynamic mechanical properties, and tensile properties of the hybrid films were evaluated as the function of TEOS oligomer content. The morphology of the hybrid films was examined using atomic force microscopy (AFM). The microscopy and dynamic mechanical data indicated that the hybrid films were heterogeneous materials with various inorganic particle sizes dispersed within the organic matrix. The results indicated that after incorporating the TEOS oligomer, the strength and thermal stability of the hybrid films were enhanced.

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Improving UV Curing in Lignin-Containing Photopolymers for Stereolithography by Chemical Reduction and Acetylation

10.26434/chemrxiv.10299416 ◽

2019 ◽

Author(s):

Jordan T. Sutton ◽

Kalavathy Rajan ◽

David P. Harper ◽

Stephen Chmely

Keyword(s):

Thermal Stability ◽

Chemical Modification ◽

Chemical Reduction ◽

Uv Curing ◽

Uv Absorption ◽

Uv Curable ◽

Reduction Reactions ◽

Commercial Use ◽

Resin Formulation ◽

Modified Lignin

Despite recent successes incorporating lignin into photoactive resins, lignin photo-properties can be detrimental to its application in UV-curable photopolymers, especially to customized, engineered resins for use in stereolithography printing. We report on chemical modification techniques employed to reduce UV absorption in lignin and the resulting mechanical, thermal, and cure properties in these lignin-containing materials. Pine lignin was modified using acetylation and reduction reactions and incorporated into a printable resin formulation. Modified lignin displayed enhanced printing properties because UV absorption at the 3D printable range was reduced in all acylated lignin from 25% up to greater than 60%. Resins made with the modified lignin showed increased stiffness and strength with lower thermal stability. Investigating these techniques is an important step in developing lignin for use in UV-curing applications and furthers the effort to valorize lignin toward commercial use.

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Formation of Barrier Ribs via Micro Molding Process Using UV-Curable Paste

Materials Science Forum ◽

10.4028/www.scientific.net/msf.534-536.1029 ◽

2007 ◽

Vol 534-536 ◽

pp. 1029-1032

Author(s):

Yong Seog Kim ◽

Tae Gum Koh ◽

Yoo Seong Kim

Keyword(s):

Uv Curing ◽

Processing Route ◽

Curing Process ◽

Plasma Display Panel ◽

Molding Process ◽

Uv Curable ◽

Processing Cost ◽

Plasma Display ◽

Uv Curing Process ◽

Sintering Shrinkage

In an attempt to reduce processing cost and to improve the resolution of PDPs, a micro mold transfer processing route for barrier ribs of plasma display panel was attempted. In this study, the parameters that may cause defects during the process were identified, which include the shrinkage during the UV curing process, stress due to the evaporation of organic components, and sintering shrinkage. Considering such parameters, a UV curable paste was developed and the barrier ribs of PDPs were successfully processed via the process. This work demonstrated the possibility of a build-up route in manufacturing barrier ribs of PDP

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SiO2/Ladder-Like Polysilsesquioxanes Nanocomposite Coatings: Playing with the Hybrid Interface for Tuning Thermal Properties and Wettability

Coatings ◽

10.3390/coatings10100913 ◽

2020 ◽

Vol 10 (10) ◽

pp. 913

Author(s):

Massimiliano D’Arienzo ◽

Sandra Dirè ◽

Elkid Cobani ◽

Sara Orsini ◽

Barbara Di Credico ◽

...

Keyword(s):

Thermal Resistance ◽

Material Characterization ◽

Structural Organization ◽

Sio2 Nanoparticles ◽

Nanocomposite Coatings ◽

Film Material ◽

Functionalized Silica ◽

Uv Curable ◽

Silica Fillers ◽

Hybrid Interface

The present study explores the exploitation of ladder-like polysilsesquioxanes (PSQs) bearing reactive functional groups in conjunction with SiO2 nanoparticles (NPs) to produce UV-curable nanocomposite coatings with increased hydrophobicity and good thermal resistance. In detail, a medium degree regular ladder-like structured poly (methacryloxypropyl) silsesquioxane (LPMASQ) and silica NPs, either naked or functionalized with a methacrylsilane (SiO2@TMMS), were blended and then irradiated in the form of a film. Material characterization evidenced significant modifications of the structural organization of the LPMASQ backbone and, in particular, a rearrangement of the silsesquioxane chains at the interface upon introduction of the functionalized silica NPs. This leads to remarkable thermal resistance and enhanced hydrophobic features in the final nanocomposite. The results suggest that the adopted strategy, in comparison with mostly difficult and expensive surface modification and structuring protocols, may provide tailored functional properties without modifying the surface roughness or the functionalities of silsesquioxanes, but simply tuning their interactions at the hybrid interface with silica fillers.

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