The lifetime prediction of epoxy resin adhesive based on small-sample data

Zhu, Yipeng; Zhao, Tingdi; Jiao, Jian; Chen, Zhiwei

doi:10.1016/j.engfailanal.2019.04.007

Cited by 18 publications

(11 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Liquid crystal monomers are sealed between two glass substrates by epoxy resin within host materials. When aged epoxy resins become brittle, cracks may occur under the influences of humidity, heat, and/or mechanical impact. In such cases, LCMs may leak from the screens and are likely to affect indoor air quality because broken mobile phones are often stored indoors for extended time periods. , However, the environmental and human health effects of LCMs are not well understood.…”

Section: Introductionmentioning

confidence: 99%

Emissions of Liquid Crystal Monomers from Obsolete Smartphone Screens in Indoor Settings: Characteristics and Human Exposure Risk

Feng

Sun

Zeng

2022

Environ. Sci. Technol.

View full text Add to dashboard Cite

Liquid crystal monomers (LCMs) have been found to accumulate in indoor environments, but the emission kinetics of LCMs from electronic devices are not well understood. Leakage from damaged liquid crystal displays may be an important mechanism for LCMs to enter the environment and become potential health hazards to humans. To address this issue, we conducted chamber experiments to characterize the emissions of LCMs from obsolete smartphone screens and estimated the doses of residential and occupational exposures to LCMs. The emission rates of the detected LCMs were in the ranges of 0.1–7 μg m–2 h–1 at 80 °C, 0.05–7 μg m–2 h–1 at 60 °C, and 0.002–0.2 μg m–2 h–1 at 25 °C. Liquid crystal monomers with large molecular weights and low volatilities tended to accumulate at screen surfaces and were re-emitted at elevated temperatures, leading to high emission rates of heavy LCMs upon thermal treatment. The estimated doses of residential and occupational exposures to individual LCMs were 0.0001–0.009 and 0.007–2 ng kg–1 d–1, respectively. As LCMs are potentially carcinogenic based on in silico assessments, LCMs emitted from obsolete smartphones in indoor settings may become human health hazards.

show abstract

Section: Introductionmentioning

confidence: 99%

Emissions of Liquid Crystal Monomers from Obsolete Smartphone Screens in Indoor Settings: Characteristics and Human Exposure Risk

Feng

Sun

Zeng

2022

Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…C 0 is a constant, C 0 = 1, to ensure that M (0)/ m ∞ = 0 when t = 0. According to Arrhenius Theory, when the temperature increases by 10 K, the rate of chemical reaction and physical dissolution is doubled, and the service life of the material is halved [ 22 ]. So the exponential term 2 ( Tref − T )/10 is constructed.…”

Section: Modified Langmuir Model Considering Composite Degradationmentioning

confidence: 99%

A Modified Langmuir Model for Moisture Diffusion in UGFRE of Composite Insulator Considering the Composite Degradation

Yuan

Wang²,

Jin

et al. 2022

Polymers

View full text Add to dashboard Cite

Water invasion induced aging and degradation of the unidirectional glass fiber reinforced epoxy resin (UGFRE) rod is inferred as the primary reason for the decay-like fracture of the composite insulator. In this paper, the moisture diffusion processes in the UGFRE from different directions at various test humidities and temperatures are studied. The moisture diffusion of the UGFRE sample obeys the Langmuir diffusion law under the humidity conditions of 53%, 82% and 100% at 40 °C. In deionized water, the moisture diffusion of the UGFRE sample also obeys the Langmuir diffusion law when the invading direction is vertical to the glass fiber. However, when the water invades the UGFRE sample, parallel with the glass fiber, the weight loss caused by composite degradation should not be neglected. A modified Langmuir model, taking Arrhenius Theory and the nonlinear aging characteristic of the composite into consideration, is proposed and can successfully describe the moisture diffusion process. Both the glass fibers and epoxy resin will degrade in the deionized water. The glass fibers show better resistance to degradation than the epoxy resin. The epoxy resin degrades from the glass fiber/epoxy resin interface and become fragments. For composite insulators, the water invasion through the ends should be avoided as far as possible, or the degradation of the UGFRE rod will result in decay-like fracture.

show abstract

“…The assessment of the service life of adhesive is of great research significance for ensuring the reliability of prestressed systems. In general, in order to keep reasonable test and save costs, the artificial accelerated degradation test based on high‐temperature stress is a widely applicable method for studying the lifetime of polymer materials 4,5 . It involves conducting mechanical properties tests under higher temperature stress without changing the degradation mechanism of the polymer materials.…”

Section: Introductionmentioning

confidence: 99%

Life prediction of thermal aging of adhesive for retard‐bonded prestressed tendons

Jiang,

Li,

et al. 2023

J of Applied Polymer Sci

View full text Add to dashboard Cite

The effectiveness of the adhesive was an important guarantee for the retard‐bonded prestressing technology. This study concentrated on quickly and reasonably predicting the service life of the adhesive. Samples of the adhesive were exposed in air circulating ovens set at 170, 190, and 210°C for various periods of time. The tensile shear strength of unaged and aged samples was tested. Two life prediction methods based on performance degradation data were presented in this paper. The improved Arrhenius model could improve the credibility and accuracy of extrapolation results meanwhile explains the non‐Arrhenius characteristics of adhesive at low temperature. The lifetime prediction result of the neural network model was close to that of the improved Arrhenius model. The conclusion is that the aging lifetime of adhesive is more than 70 years at an environment below 40°C. The research results provide direct and effective reference value for the life prediction of accelerated failure tests of adhesives.

show abstract

The lifetime prediction of epoxy resin adhesive based on small-sample data

Cited by 18 publications

References 9 publications

Emissions of Liquid Crystal Monomers from Obsolete Smartphone Screens in Indoor Settings: Characteristics and Human Exposure Risk

Emissions of Liquid Crystal Monomers from Obsolete Smartphone Screens in Indoor Settings: Characteristics and Human Exposure Risk

A Modified Langmuir Model for Moisture Diffusion in UGFRE of Composite Insulator Considering the Composite Degradation

Life prediction of thermal aging of adhesive for retard‐bonded prestressed tendons

Contact Info

Product

Resources

About