scholarly journals Spectrophotometric evaluation of pigmented urethane acrylate coating colour stability

2019 ◽  
Vol 660 ◽  
pp. 012058
Author(s):  
Z Grigale-Soročina ◽  
I Birks ◽  
R Pilipavica
Keyword(s):  
Urethane Acrylate ◽  
Colour Stability ◽  
Coating Colour

PRINTING. The ageing resistance of offset and electrophotographic prints

2012 ◽  
Vol 27 (4) ◽  
pp. 739-749
Author(s):  
Silva Grilj ◽  
Tadeja Muck ◽  
Diana Gregor-Svetec
Keyword(s):  
Relative Humidity ◽  
Surface Coating ◽  
Accelerated Ageing ◽  
Colour Stability ◽  
Light Fastness ◽  
Moist Heat ◽  
Printing Technique ◽  
Lower Light ◽  
Recycled Fibres ◽  
2D And 3D

Abstract The moist heat (80°C and 65% relative humidity) and light (xenon arc lamp) treatments of accelerated ageing were applied to investigate the colour stability of offset and electrophotographic prints on papers made of virgin and I 00% recycled fibres. The prints were evaluated using spectrophotometric measurements and additional colour differences calculations. In addition to the colour differences, the 2D and 3D colour gamuts are presented. The results reveal the different colour stability of prints. The effect depends on the type of accelerated ageing, printing technique, composition of ink and paper characteristics. Moist heat ageing has less influence on colour stability than light ageing. The electrophotographic prints show better ageing resistance than offset prints. The intluence of ink on print light fastness is considerable. Azo pigments in magenta and yellow have lower light fastness than phthalocyanine pigments in cyan or carbon black. The surface coating has an intluence on light fastness of prints. Meanwhile, prints on recycled papers show similar colour stability compared to prints on papers made of virgin fibres

scholarly journals Synthesis of phosphorus-containing polyurethanes and poly(urethane-acrylate)s

2017 ◽  
Vol 41 ◽  
pp. 630-647 ◽  
Author(s):  
Mahir Burak SÜDEMEN ◽  
Hacer Ayşen ÖNEN
Keyword(s):  
Urethane Acrylate ◽  
Phosphorus Containing

The influence of cigarette smoke on colour stability and friction property of aesthetic orthodontic wires—In vitro study

2020 ◽  
Vol 18 (3) ◽  
pp. 555-560
Author(s):  
Flávio Mendonça Copello ◽  
Lincoln Issamu Nojima ◽  
Margareth Maria Gomes Souza ◽  
Matheus Melo Pithon ◽  
Antônio Carlos Oliveira Ruellas ◽  
...  
Keyword(s):  
Cigarette Smoke ◽  
In Vitro Study ◽  
Vitro Study ◽  
Colour Stability ◽  
Friction Property ◽  
Orthodontic Wires

Transparent water-based UV-curable urethane acrylate ink-jet ink

2021 ◽  
pp. 1-11
Author(s):  
Atasheh Soleimani-Gorgani ◽  
Farhood Najafi ◽  
Fatemeh Mohammadrezaei ◽  
Behzad Shirkavand Hadavand
Keyword(s):  
Urethane Acrylate ◽  
Uv Curable ◽  
Ink Jet ◽  
Water Based ◽  
Transparent Water

scholarly journals Mechanical Properties and Biocompatibility of Urethane Acrylate-Based 3D-Printed Denture Base Resin

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 822
Author(s):  
Jy-Jiunn Tzeng ◽  
Tzu-Sen Yang ◽  
Wei-Fang Lee ◽  
Hsuan Chen ◽  
Hung-Ming Chang
Keyword(s):  
Mechanical Properties ◽  
3D Printing ◽  
Flexural Modulus ◽  
Measurement Data ◽  
Uv Exposure ◽  
Control Group ◽  
Urethane Acrylate ◽  
Shore Hardness ◽  
Digital Light Processing ◽  
Denture Base

In this study, five urethane acrylates (UAs), namely aliphatic urethane hexa-acrylate (87A), aromatic urethane hexa-acrylate (88A), aliphatic UA (588), aliphatic urethane triacrylate diluted in 15% HDD (594), and high-functional aliphatic UA (5812), were selected to formulate five UA-based photopolymer resins for digital light processing (DLP)-based 3D printing. Each UA (40 wt%) was added and blended homogenously with ethoxylated pentaerythritol tetraacrylate (40 wt%), isobornyl acrylate (12 wt%), diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide (3 wt%), and a pink acrylic (5 wt%). Each UA-based resin specimen was designed using CAD software and fabricated using a DLP 3D printer to specific dimensions. Characteristics, mechanical properties, and cytotoxicity levels of these designed UA-based resins were investigated and compared with a commercial 3D printing denture base acrylic resin (BB base) control group at different UV exposure times. Shore hardness-measurement data and MTT assays were analyzed using a one-way analysis of variance with Bonferroni’s post hoc test, whereas viscosity, maximum strength, and modulus were analyzed using the Kruskal–Wallis test (α = 0.05). UA-based photopolymer resins with tunable mechanical properties were successfully prepared by replacing the UA materials and the UV exposure times. After 15 min of UV exposure, the 5812 and 594 groups exhibited higher viscosities, whereas the 88A and 87A groups exhibited lower viscosities compared with the BB base group. Maximum flexural strength, flexural modulus, and Shore hardness values also revealed significant differences among materials (p < 0.001). Based on MTT assay results, the UA-based photopolymer resins were nontoxic. In the present study, mechanical properties of the designed photopolymer resins could be adjusted by changing the UA or UV exposure time, suggesting that aliphatic urethane acrylate has good potential for use in the design of printable resins for DLP-type 3D printing in dental applications.

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