UV stability of self-healing poly(methacrylate) network layers

Ehrhardt, D.; Mangialetto, Jessica; Durme, Kurt Van; Mele, Bruno Van; Brande, Niko Van den

doi:10.1016/j.polymdegradstab.2022.109930

Cited by 5 publications

(1 citation statement)

References 28 publications

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“…Consequently, research in this area predominantly concentrates on employing these factors in accelerated aging tests to thoroughly investigate the aging dynamics of polymer materials under such conditions [30–32]. With the growing application of polymers in high‐radiation settings, the exploration of their aging behavior in these environments has increasingly garnered attention [33, 34]. Additionally, investigations into the aging effects under simulated light, temperature, and weather conditions are vital for a holistic understanding of the aging behavior of polymer materials [35, 36].…”

Section: Introductionmentioning

confidence: 99%

Analysis of thermomechanical coupled accelerated aging of HTPB propellants

Zeng,

Huang,

Chen

et al. 2024

Propellants Explo Pyrotec

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This study employed macroscopic uniaxial compression tests at low and medium strain rates, coupled with microscopic electron microscopy, to extensively analyse the impact of thermomechanical coupled aging on the accelerated aging of Hydroxyl‐terminated Polybutadiene (HTPB) propellants, contrasting it with the effects of isolated factors such as heat and dynamic reciprocating force. Results indicate that at various environmental temperatures (323 K, 343 K, and 363 K), thermomechanical coupled aging more significantly affects HTPB propellants than isolated factors. This effect is macroscopically evident in increased ease of deformation, permanent deformation during aging, continual increase in dissipated energy, and a decrease in average stress and ultimate strain post‐aging. Microscopically, the effect predominantly arises from the interplay between matrix thermal degradation and particle fragmentation, which rapidly accumulate and substantially impact the material's macroscopic mechanical properties. Furthermore, as the aging temperature rises, the alterations in both macroscopic mechanical properties and microscopic morphology of HTPB propellants become more pronounced. However, overly high temperatures may swiftly result in substantial material performance deterioration. Consequently, while elevating temperature effectively accelerates thermomechanical aging, the potential adverse effects on material performance must be judiciously considered. This underscores the necessity of balancing temperature regulation with aging efficiency enhancement in HTPB propellants to ensure effective control and quantitative assessment of the aging process, while minimizing material degradation.

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Section: Introductionmentioning

confidence: 99%

Analysis of thermomechanical coupled accelerated aging of HTPB propellants

Zeng,

Huang,

Chen

et al. 2024

Propellants Explo Pyrotec

View full text Add to dashboard Cite

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Anti‐Environmental Aging Passive Daytime Radiative Cooling

Song,

Shen,

Shao

et al. 2023

Advanced Science

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Passive daytime radiative cooling technology presents a sustainable solution for combating global warming and accompanying extreme weather, with great potential for diverse applications. The key characteristics of this cooling technology are the ability to reflect most sunlight and radiate heat through the atmospheric transparency window. However, the required high solar reflectance is easily affected by environmental aging, rendering the cooling ineffective. In recent years, significant advancements have been made in understanding the failure mechanisms, design strategies, and manufacturing technologies of daytime radiative cooling. Herein, a critical review on anti‐environmental aging passive daytime radiative cooling with the goal of advancing their commercial applications is presented. It is first introduced the optical mechanisms and optimization principles of radiative cooling, which serve as a basis for further endowing environmental durability. Then the environmental aging conditions of passive daytime radiative cooling, mainly focusing on UV exposure, thermal aging, surface contamination and chemical corrosion are discussed. Furthermore, the developments of anti‐environmental aging passive daytime radiative cooling materials, including design strategies, fabrication techniques, structures, and performances, are reviewed and classified for the first time. Last but not the least, the remaining open challenges and the insights are presented for the further promotion of the commercialization progress.

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Breaking barriers: Sunlight‐activated self‐healing polymers with unprecedented photoaging resistance

Li,

Zhang,

Rong

et al. 2024

SusMat

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Sunlight‐triggered self‐healing of polymers has attractive advantages, but the same illumination inevitably causes photoaging. The resulting properties deterioration and shortened lifespan run counter to the desire for self‐healing. Herein, the authors propose an innovative solution by introducing carbazolyl‐based dithiocarbamate units. The proof‐of‐concept crosslinked poly(carbazolyl dithiocarbamates‐urethane) shows that the multitasking reactivities of the dynamic bonds stimulated by the sun's ultraviolet rays concurrently implement self‐healing and improve the photoaging resistance. As reflected by the xenon weatherometer measurements, it retains 73.5% of the original strength after 576 h owing to the effects of hydroperoxide intermediates elimination and fluorescence emission. The anti‐photoaging ability is far superior to the control filled with commercial stabilizer. Meantime, networks rearrangement via dynamic exchange reactions among the sunlight‐sensitive dithiocarbamates and long‐range free radicals transfer are allowed in surface layer and the interior, so that the cracks up to 8.5 mm deep are repaired. The work provides a feasible way to break the bottleneck in application of photochemical self‐healing polymers.

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UV stability of self-healing poly(methacrylate) network layers

Cited by 5 publications

References 28 publications

Analysis of thermomechanical coupled accelerated aging of HTPB propellants

Analysis of thermomechanical coupled accelerated aging of HTPB propellants

Anti‐Environmental Aging Passive Daytime Radiative Cooling

Breaking barriers: Sunlight‐activated self‐healing polymers with unprecedented photoaging resistance

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