Effects of high temperature and ultraviolet radiation on polymer composites

Ching, Yern Chee; Gunathilake, Tms Udenni; Ching, Kuan Yong; Chuah, Cheng Hock; Sandu, V.; Singh, Ramesh; Liou, Nai-Shang

doi:10.1016/b978-0-08-102290-0.00018-0

Cited by 30 publications

(12 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is well known that epoxy properties are strongly dependent on the usage conditions, such as time and temperature. When exposed to temperatures of about 100-200 • C, polymers suffer from softening, creep, distortion, and deterioration of mechanical properties [48]. Figure 5 shows the occurrence of voids formed since the first exposure time, as well as the change of color, which is related to the irreversible aging mechanism.…”

Section: Effects Of Thermal Aging On Plain Epoxymentioning

confidence: 99%

“…The aging of polymers in an oxidative environment, such as the one employed in this study, leads to a heterogeneous degradation, which is governed by the diffusion of oxygen through the polymer [41]. Previous studies [41,48,49] have indicated that thermal aging has a strong influence on the properties of polymer-based materials. The whitecolored spots in the SEM image of Figure 5d are related to an oxide layer observed in all thermally aged epoxies [50].…”

Section: Effects Of Thermal Aging On Plain Epoxymentioning

confidence: 99%

See 1 more Smart Citation

Dynamic Mechanical Analysis of Thermally Aged Fique Fabric-Reinforced Epoxy Composites

et al. 2021

View full text Add to dashboard Cite

Dynamic mechanical analysis (DMA) is one of the most common methods employed to study a material’s viscoelastic properties. The effect of thermal aging on plain epoxy and a fique fabric-reinforced epoxy composite was investigated by comparing the mass loss, morphologies, and DMA properties of aged and unaged samples. In fact, thermal aging presents a big challenge for the high-temperature applications of natural fiber composites. In this work, both plain epoxy and fique fabric-reinforced epoxy composite were found to have different molecular mobility. This leads to distinct transition regions, with different changes in intensity caused by external loadings from time-aging. Three exponentially modified Gauss distribution functions (EMGs) were applied to loss factor curves of fique fabric-reinforced epoxy composite and plain epoxy, which allowed identifying three possible mobility ranges. From these results it was proposed that the thermal degradation behavior of natural fibers, especially fique fiber and their composites, might be assessed, based on their structural characteristics and mechanical properties.

show abstract

Section: Effects Of Thermal Aging On Plain Epoxymentioning

confidence: 99%

Section: Effects Of Thermal Aging On Plain Epoxymentioning

confidence: 99%

Dynamic Mechanical Analysis of Thermally Aged Fique Fabric-Reinforced Epoxy Composites

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Furthermore, the extensive use of polymers in developing insulating materials is in their naturally stable chemical and physical compositions. However, the mechanical constituents can be improved by adding inorganic fillers [7]. The utilization of air conditioners in most regions results from the hot-humid climate in these regions.…”

Section: Introductionmentioning

confidence: 99%

An Overview of Thermal Insulation Material for Sustainable Engineering Building Application

Okokpujie¹,

Essien²,

Ikumapayi³

et al. 2022

IJDNE

View full text Add to dashboard Cite

Residential buildings help to facilitate the occupants against solar radiation and adverse weather conditions. However, the growing increase in climate change in our environment has resulted in different side effects on human’s health mostly in the northern region of Nigeria and other parts of the world where high radiation from the sun are experience. This has resulted to the key interests of this research on possible thermal insulation materials that can help resist or absorb the solar radiation effects that can cause damage to lives in our community. This literature review of thermal insulation materials aims to proffer a sustainable solution by evaluating the thermal performance of building materials to provide an eco-friendly environment for building occupants. This research also discusses the Application of Thermal Insulation Materials for Developing Roofing sheets. The classification of thermal insulation materials, heat transfer in insulation materials, factors that influence the choice of building materials and thermal conductivity, resistivity, resistance, and conductance. Advantages of building insulation materials on economic, comfort, and environmental were also studied, and the reviewing of previous and incorporating thermal insulation materials with roofs. From the critical review, the application of insulating materials for developing building materials is highly recommended due to the provision of an eco-friending environment with reduced energy consumption during applications of home appliances.

show abstract

“…The nonlinearity impacted the creep compliance and relaxation modulus [6]. Deformation of polymeric materials becomes more critical as the temperature reaches the glass transition temperature (T g ) [8]. Polymer softening near T g is a significant problem to deteriorate viscoelastic resistance [9].…”

Section: Introductionmentioning

confidence: 99%

Stress Dependency of Creep Response for Glass/Epoxy Composite at Nonlinear and Linear Viscoelastic Behavior

Nosrati

Zabett

Sahebian

2022

International Journal of Polymer Science

View full text Add to dashboard Cite

This research is aimed at comparing the stress dependency of creep viscoelastic behavior for glass/epoxy composite and neat epoxy close to the glass transition temperature and room temperature. Long-term creep performance of quasi-unidirectional composites and quasi-isotropic stacking sequence composites is modeled based on the time-stress superposition principle (TSSP). Linearity and nonlinearity of viscoelastic behavior and stress-dependence correlations were investigated for quasi-isotropic stacking sequence composite at 25°C and 50°C (near the glass transition temperature). Stress dependency of creep stages (primary, secondary, and tertiary) of neat epoxy was evaluated at this range of temperature. The prediction results of composite at room temperature show that the raising of the stress levels leads to the acceleration of viscoelastic strain values, but the creep compliance does not present any dependency. Besides, the reduction of viscoelastic ability is realized by measuring less amount of creep compliance at higher stress level in the glass transition temperature. These observations confirmed the linearity and nonlinearity of viscoelastic behavior at room and glass transition temperature, respectively. Similar results of neat epoxy revealed that the increase in the stress level accelerates the strain values at room temperature and decreases the creep resistance at glass transition temperature. Failure morphologies of epoxy sample fractured at room temperature are included scarp, cusp, and river line; however, close to the glass transition temperature, more expansive mirror zones appeared. Fiber architecture significantly affected the secondary stage regime by providing load-bearing ability. Thereby, creep rate reduction and enhancement of creep lifetime and creep resistance would be reported using unidirectional reinforcing in contrast to those of the multilayer sequence one.

show abstract

Effects of high temperature and ultraviolet radiation on polymer composites

Cited by 30 publications

References 43 publications

Dynamic Mechanical Analysis of Thermally Aged Fique Fabric-Reinforced Epoxy Composites

Dynamic Mechanical Analysis of Thermally Aged Fique Fabric-Reinforced Epoxy Composites

An Overview of Thermal Insulation Material for Sustainable Engineering Building Application

Stress Dependency of Creep Response for Glass/Epoxy Composite at Nonlinear and Linear Viscoelastic Behavior

Contact Info

Product

Resources

About