Accelerated UV Aging of a Wax-Based Binder Used in Synthetic Granular Composite Equine Sports Surfaces

2021 ◽  
Vol 50 (1) ◽  
pp. 20210042
Author(s):  
John W. Bridge ◽  
Cham Hang Yeung ◽  
Kaleb M. Dempsey ◽  
Devin A. Yoshizumi ◽  
Kristofer S. Weisshaupt
Keyword(s):  
Uv Aging ◽  
Granular Composite ◽  
Equine Sports

scholarly journals UV Aging Behavior of Functionalized Mullite Nanofiber-Reinforced Polypropylene

ACS Omega ◽  
2020 ◽  
Vol 5 (42) ◽  
pp. 27083-27093
Author(s):  
Anish M. Varghese ◽  
Vengatesan M. Rangaraj ◽  
Gisha Luckachan ◽  
Vikas Mittal
Keyword(s):  
Aging Behavior ◽  
Uv Aging

UV-Aging Resistance of Packaging Waste PE Modified Asphalts

2009 ◽  
Vol 48 (9) ◽  
pp. 945-949 ◽  
Author(s):  
Changqing Fang ◽  
Maorong Zhang ◽  
Zengping Zhang ◽  
Shisheng Zhou
Keyword(s):  
Uv Aging ◽  
Packaging Waste ◽  
Aging Resistance

scholarly journals Biocomposites of Epoxidized Natural Rubber/Poly(lactic acid) Modified with Natural Fillers (Part I)

2021 ◽  
Vol 22 (6) ◽  
pp. 3150
Author(s):  
Anna Masek ◽  
Stefan Cichosz ◽  
Małgorzata Piotrowska
Keyword(s):  
Tensile Strength ◽  
Lactic Acid ◽  
Natural Rubber ◽  
Epoxidized Natural Rubber ◽  
Poly Lactic Acid ◽  
Uv Aging ◽  
High Elasticity ◽  
Natural Fillers ◽  
Natural Additives

The study aimed to prepare sustainable and degradable elastic blends of epoxidized natural rubber (ENR) with poly(lactic acid) (PLA) that were reinforced with flax fiber (FF) and montmorillonite (MMT), simultaneously filling the gap in the literature regarding the PLA-containing polymer blends filled with natural additives. The performed study reveals that FF incorporation into ENR/PLA blend may cause a significant improvement in tensile strength from (10 ± 1) MPa for the reference material to (19 ± 2) MPa for the fibers-filled blend. Additionally, it was found that MMT employment in the role of the filler might contribute to ENR/PLA plasticization and considerably promote the blend elongation up to 600%. This proves the successful creation of the unique and eco-friendly PLA-containing polymer blend exhibiting high elasticity. Moreover, thanks to the performed accelerated thermo-oxidative and ultraviolet (UV) aging, it was established that MMT incorporation may delay the degradation of ENR/PLA blends under the abovementioned conditions. Additionally, mold tests revealed that plant-derived fiber addition might highly enhance the ENR/PLA blend’s biodeterioration potential enabling faster and more efficient growth of microorganisms. Therefore, materials presented in this research may become competitive and eco-friendly alternatives to commonly utilized petro-based polymeric products.

scholarly journals Investigation of PEG/mixed metal oxides as a new form-stable phase change material for thermoregulation and improved UV ageing resistance of bitumen

RSC Advances ◽  
2020 ◽  
Vol 10 (73) ◽  
pp. 44903-44911
Author(s):  
Suhong Zhu ◽  
Tao Ji ◽  
Dongyu Niu ◽  
Zhengxian Yang
Keyword(s):  
Service Life ◽  
Phase Change ◽  
Metal Oxides ◽  
Phase Change Material ◽  
Extreme Temperature ◽  
Stable Phase ◽  
Mixed Metal Oxides ◽  
Uv Aging ◽  
New Form ◽  
Change Material

As a new performance-enhancing additive, PEG/MMO PCM is expected to be effective in regulating extreme temperature and resisting UV aging of bitumen binder and thus could significantly extend the service life of bitumen pavement.

scholarly journals Accelerated aging of WPCs Based on Polypropylene and Birch plywood Sanding Dust

2021 ◽  
Vol 11 (1) ◽  
pp. 319-328
Author(s):  
Janis Kajaks ◽  
Karlis Kalnins ◽  
Juris Matvejs
Keyword(s):  
Accelerated Aging ◽  
Degree Of Crystallinity ◽  
Accelerated Weathering ◽  
Recrystallization Process ◽  
Surface Layers ◽  
Uv Aging ◽  
Polypropylene Composites ◽  
Weathering Processes ◽  
Melting Temperatures ◽  
Dsc Measurements

Abstract A lot of researchers are closely related with natural, lignocellulose fibre containing bio-composites production and studies. Various of polymer matrices, mainly polyolefins, combinations with natural fibres as a reinforcement are used. Our studies are focused on polypropylene based bio-composites containing birch plywood production by-product sanding dust (PSD) accelerated weathering processes. The obtained results showed the following sight. After the aging the surface of all samples had faded, the changes of the gloss (decreasing) and of the whiteness degree (increasing) also had taken place, but microhardness of the surface of specimens significantly has decreased. The tensile strength and modulus of the samples after UV aging diminished about 30–35%. That indicates to the changes not only in the surface layers of polymer but also inside of the polymer structure. The FTIR measurements showed that during UV aging process occurs significant changes of chemical structure of the weathered surface of all samples. DSC measurements showed an increase of degree of crystallinity of the weathered polypropylene composites after the first heating due to the recrystallization process in the polypropylene matrix and a small decreasing after second heating. The melting temperatures of all composites after UV aging considerably diminish up to 30°C.

Evaluation of Fatigue Properties for Ultraviolet Radiation Aged Bitumen and Mixture

2011 ◽  
Vol 217-218 ◽  
pp. 181-186
Author(s):  
Shao Peng Wu ◽  
Jun Han ◽  
Xing Liu
Keyword(s):  
Ultraviolet Radiation ◽  
Heavy Traffic ◽  
Testing Machine ◽  
Road Construction ◽  
Fatigue Properties ◽  
Repeated Loading ◽  
Uv Aging ◽  
Traffic Loads ◽  
Universal Testing ◽  
Layered Clay

Bitumen is widely used in road construction. Due to heavy traffic loads and environmental factors, bitumen properties will change during service life. Bitumen will age due to diffusion of oxygen and UV radiation. Repeated loading will result in decreasing strength because of fatigue. In this paper, one layer clay powder was used to modify base bitumen with different mass contents. Then the influences of ultraviolet radiation (UV) aging on the dynamic fatigue properties of the layered clay powder were evaluated by Dynamic Shear Rheomoter (DSR) and Universal Testing Machine (UTM). The ageing evaluation shows that the ageing resistance of bitumen is improved and this improvement is more notable in bitumen fatigue than mixture.

UV aging of poly(propylene)/wood-fiber composites

2004 ◽  
Vol 25 (5) ◽  
pp. 543-553 ◽  
Author(s):  
Ragnar Seldén ◽  
Birgitha Nyström ◽  
Runar Långström
Keyword(s):  
Wood Fiber ◽  
Fiber Composites ◽  
Uv Aging ◽  
Poly Propylene

Influence of Force Chains Behaviors on Strength of Al/W/PTFE Granular Composite

2021 ◽  
Vol 324 ◽  
pp. 94-99
Author(s):  
Le Tang ◽  
Die Hu ◽  
Sheng Zhou ◽  
Chao Ge ◽  
Hai Fu Wang ◽  
...  
Keyword(s):  
Random Distribution ◽  
Force Chains ◽  
Metal Particles ◽  
Fracture Mechanisms ◽  
Mesoscale Simulation ◽  
Dynamic Simulations ◽  
Granular Composite ◽  
Compressive Response ◽  
Cracks Propagation ◽  
The Stability

Mesoscale simulation is conducted to investigate the effect of force chains between metal particles on the mechanical behavior of aluminum-tungsten-polytetrafluoroethylene (Al/W/PTFE) granular composite under a strain-controlled loading. A two-dimensional model followed the random distribution of particles is developed. Dynamic simulations are performed with variations in the size of Al particles to reveal the strength and fracture mechanisms of the composites. The results indicate that, force chains governed by the number and the size of metal particles significantly affects the global compressive response and macro-cracks propagation. The stability and reconstruction of mesoscale force chains explain the phenomenon that a higher strength is observed in the material with fine Al particles. Combined with the angle between particles, we examine the properties of force chains and the network as they evolve during the course of the deformation. Findings indicate that reactive composites tend to produce shorter chains, and straighter force chains with a smaller force angle result in a macroscopically stronger granular material.

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