Artificial Aging Test Analysis of Alkyd and Polyurethane Coating System

2012 ◽  
Vol 496 ◽  
pp. 116-120 ◽  
Author(s):  
Pan Liu
Keyword(s):  
Failure Mechanism ◽  
Artificial Aging ◽  
Accelerated Aging ◽  
Coating System ◽  
Test Analysis ◽  
Natural Exposure ◽  
Accelerated Aging Test ◽  
Aging Test ◽  
Long Time ◽  
Artificial Uv

Paint aging will take a long time under the conditions of natural exposure, their failure mechanism can't be known quickly. So the artificial UV-condensation accelerated aging test is used to alkyd system and polyurethane system, and the coating aging was analyzed by using SEM, gloss meter and FTIR. The results shown that their failure mechanism is different, the main reason that life of alkyd system was lower than polyurethane system is its weak water-resistant. If the water-resistant of alkyd system can be improved, the use area of alkyd system will be expanded.

scholarly journals Association between the artificial aging test and the natural storage of coffee seeds

2018 ◽  
Vol 40 (2) ◽  
pp. 164-172 ◽  
Author(s):  
Tatiana Botelho Fantazzini ◽  
Dellyzete Veiga Franco da Rosa ◽  
Cristiane Carvalho Pereira ◽  
Diego de Sousa Pereira ◽  
Marcelo Ângelo Cirillo ◽  
...  
Keyword(s):  
Coffea Arabica ◽  
Artificial Aging ◽  
Accelerated Aging ◽  
Coffea Canephora ◽  
Correlation Factor ◽  
Controlled Environment ◽  
Accelerated Aging Test ◽  
Aging Test ◽  
Storage Potential ◽  
Coffea Arabica L

Abstract: The accelerated aging test is recognized as an efficient method for evaluating the vigor of seed lots and for estimating their storage potential. Thus, this work aimed to evaluate the association between artificial aging and natural storage of coffee seeds, through the correlation factor analysis. Seeds of four cultivars of Coffea arabica L. (Catuaí Amarelo, Arara, Catiguá, and Mundo Novo) and one of Coffea canephora Pierre (Apoatã) were used. Part of the newly-harvested seeds were aged in a growth chamber under controlled temperature and relative humidity conditions (42 ºC and 100% RH) for periods of 0, 4, 6, 8, and 10 days. The other part of the seeds was stored in tri-wall paper packaging for a period of 2, 4, and 6 months in a non-climate-controlled environment. Artificial aging allows predictions on the storage potential of coffee seeds, although the artificial aging periods depend on the cultivars.

Different Curing Agents on the Photoaging of Polyurethane Coatings

2011 ◽  
Vol 189-193 ◽  
pp. 1109-1112
Author(s):  
Bin Xiang ◽  
Qing Xiang ◽  
Jin Liao ◽  
Shi Chen ◽  
Zhong Cheng Xu
Keyword(s):  
Accelerated Aging ◽  
Color Difference ◽  
Uv Absorption ◽  
Uv Exposure ◽  
Polyurethane Coatings ◽  
Accelerated Aging Test ◽  
Aging Test ◽  
Aging Resistance ◽  
Curing Agents ◽  
Artificial Uv

In this paper, the artificial UV accelerated aging test was used to investigate the effect of curing agents including TDI-TMP prepolymer, N75, N3390 and IPDI propylene acid resin on the photoaging of polyurethane (PU) coatings. The thickness and gloss loss, color difference, as well as UV absorption of PU coatings were measured during the UV exposure, meanwhile FTIR and SEM were utilized to monitor the chemical and mophological change after UV exposure. The TDI-TMP prepolymer coatings showed the worst aging resistance and whilst the results of N3390 coatings are relatively good.

Research on Analytical Procedure of Failure Mechanism Consistency in Rubber Material Accelerated Ageing Test

2012 ◽  
Vol 184-185 ◽  
pp. 653-656 ◽  
Author(s):  
Li Jun Fu ◽  
Wei Fang Zhang ◽  
Shuang Wang ◽  
Zong Ren Wang ◽  
Qing Yun Tang
Keyword(s):  
Thermal Analysis ◽  
Failure Mechanism ◽  
Analytical Method ◽  
Analytical Procedure ◽  
Accelerated Aging ◽  
Accelerated Ageing ◽  
Rubber Material ◽  
Advantages And Disadvantages ◽  
Accelerated Aging Test ◽  
Aging Test

This paper summarizes the advantages and disadvantages of existing analytical methods of failure mechanism consistency in the accelerated aging test at first. And then according to the characteristics of the rubber material, a kind of rubber failure mechanism consistency analytical method based on failure physics is offered by analyzing the thermal analysis curves.

scholarly journals Genetic diversity for physiological quality of seeds from corn (Zea mays L.) intervarietal crossbreeds

2013 ◽  
Vol 35 (4) ◽  
pp. 449-456 ◽  
Author(s):  
Daniele Nerling ◽  
Cileide Maria Medeiros Coelho ◽  
Rubens Onofre Nodari
Keyword(s):  
Genetic Diversity ◽  
Zea Mays L ◽  
Accelerated Aging ◽  
Genetic Contribution ◽  
Percentage Germination ◽  
Canonical Variables ◽  
Accelerated Aging Test ◽  
Aging Test ◽  
Physiological Quality

The physiological quality is based on the genotype and may be accompanied since the first stages of selection through the study of genetic diversity. The purpose of this study was to evaluate the parental genetic contribution in the seed physiological quality in corn intervarietal crossbreeds. The intervarietal crossbreeds were performed using landraces genotypes, open pollinated varieties and commercial hybrids. The seeds obtained from the crossbreed, their equivalents and parentals were evaluated regarding their water percentage, germination, germination speed rate, accelerated aging, field emergence and electrical conductivity. The seeds obtained in the crossbreed are viable and vivid with heterosis when compared with the parentals. The accelerated aging test was more effective for selecting the strongest genotypes. The canonical variables were useful to group the genotypes that presented similar physiological characteristics. The genotypes MPA 01 x Pixurum 05, MPA 01 x AS1565, MPA 01 x SJC5886, SJC5886 x Pixurum 05 and Fundacep 35 x SCS 154 Fortuna were the best crossbreeds regarding the production of better physiological quality seeds.

scholarly journals Accelerated aging test in amaranth (Amaranthus cruentus L.) seeds

2018 ◽  
Vol 12 (03) ◽  
pp. 444-448
Author(s):  
Andréa Bicca Noguez Martins ◽  
◽  
Caroline Jácome Costa ◽  
Fernanda da Motta Xavier ◽  
André Pich Brunes ◽  
...  
Keyword(s):  
Accelerated Aging ◽  
Amaranthus Cruentus ◽  
Accelerated Aging Test ◽  
Aging Test

scholarly journals Electrical conductivity and accelerated aging in amaranth (Amaranthus crueentus L.) seeds

2018 ◽  
Vol 40 (1) ◽  
pp. 44-51
Author(s):  
Thaís D’Avila Rosa ◽  
Ariele Paula Nadal ◽  
Henrique Roberto Maldaner ◽  
Vanessa Nogueira Soares ◽  
Gizele Ingrid Gadotti ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Accelerated Aging ◽  
Water Volume ◽  
Amaranthus Cruentus ◽  
Accelerated Aging Test ◽  
Aging Test ◽  
Immersion Period ◽  
Amaranth Seed

Abstract: The objective of this study was to determine adequate conditions of water volume, seed quantity and immersion period to perform the electrical conductivity test, and to analyze the parameters of the accelerated aging test and its correlation with the the physiological potential of amaranth seeds. Five lots of amaranth seeds (Amaranthus cruentus), cultivar BRS Alegria, were used. The initial evaluation of the quality of these lots comprehended the following tests: water content, germination, first germination count, accelerated aging (traditional method, and modified versions, using unsaturated and saturated saline solution for the periods of 24, 48 and 72 h), electrical conductivity in different periods (2, 4, 6, 8 and 24 h), different quantities of water (25, 50 and 75 mL), different seed quantities (100 and 150), and field emergence. It could be concluded that the accelerated aging test at 41 °C, for 72 h, using unsaturated NaCl solution was efficient in the classification of amaranth seed lots in levels of vigor. The electrical conductivity test performed for 8 hours with 25 mL of water and 100 seeds was efficient in the classification of amaranth seeds as to their physiological potential.

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