Insight into the role of free volume in irradiation resistance to discoloration of lead‐containing plexiglass

Zhang, Yujuan; Chen, Zhiyuan; Zhao, Rui; Wang, Ke; Wu, Defeng; Wang, Chunhong; Zhang, Ming

doi:10.1002/app.51545

Cited by 5 publications

(3 citation statements)

References 45 publications

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“…The results indicate that the yield of radicals decrease. This is because crosslinking places a restriction on the mobility of molecular chain segments, and the movement ability of macromolecular free radicals decreases, slowing down the reaction rate of free radical chain growth [44]. As a result, the yield of radicals decreases, which is indicative of good characteristics of resistance to thermal oxidation aging.…”

Section: Prr =mentioning

confidence: 99%

Probing the Effect of Linear and Crosslinked POE-g-GMA on the Properties of Asphalt

Zhang,

Qian,

Xiao

et al. 2023

Materials

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The copolymer ethylene–octene (POE) has good aging resistance and is an inexpensive asphalt additive compared to the styrene–butadiene–styrene copolymer (SBS). However, POE is easy to segregate in asphalt during storage at high temperatures. Grafting glycidyl methacrylate (GMA) onto the molecular backbone of POE (i.e., POE-g-GMA) may solve this problem, for the epoxy groups in GMA can react with the active groups in asphalt. Asphalt modified with linear and crosslinked POE-g-GMA were prepared, and the hot storage stability, physical properties and thermal oxidation aging properties were discussed in detail. The results show that linear and low-degree crosslinked POE-g-GMA-modified asphalts are storage-stable at high temperatures via measurements of the difference in softening points and small-angle X-ray scattering (SAXS) characterizations from macro and micro perspectives. The difference in softening points (ΔSP) between the upper and lower ends is no more than 3.5 °C for modified asphalts after 48 h of being in an oven at 163 °C. More importantly, the crosslinking modification of POE-g-GMA can further increase the softening point and reduce the penetration as well as rheological properties via conventional physical property, dynamic shear rheometer (DSR) and multiple-stress creep recovery (MSCR) tests. Furthermore, asphalt modified with crosslinked POE-g-GMA reveals better aging resistance via measurements of the performance retention rate and electron paramagnetic resonance (EPR) characterizations after a rolling thin film oven test (RTFOT). This work may provide further guidelines for the application of polymers in asphalt.

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Section: Prr =mentioning

confidence: 99%

Probing the Effect of Linear and Crosslinked POE-g-GMA on the Properties of Asphalt

Zhang,

Qian,

Xiao

et al. 2023

Materials

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“…Non-traditional γ-ray shielding materials, including composites containing tungsten [8,9], nickel [10], rare earths [11], and metal-organic frameworks (MOFs) [12], have been extensively studied with substrates such as epoxy resin [13], polyethylene [14], rubber [15], polycarbonate [16], and plexiglass [17]. Among the fillers, tungsten has several advantages as a γ-ray shielding material, including its slightly higher shielding capacity compared to lead at the same thickness and its non-toxicity.…”

Section: Introductionmentioning

confidence: 99%

The Shielding and Mechanical Properties of Tungsten/Epoxy Composites

Zhang¹,

Nie²,

Zhang³

et al. 2023

Preprint

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With the development of nuclear technology application, radiation safety has been widely concerned, and there is an urgent need for novel shielding materials. Among the various options available, non-lead organic composite shielding material has emerged as a promising solution in the field of radiation shielding due to its high strength, easy processing, and light weight. In this study, tungsten/epoxy resin (W/EP) composite samples with tungsten weight fraction from 0% to 60% were prepared. The shielding and mechanical properties of W/EP composites were investigated. The results show that the results showed that the higher the tungsten content, the greater the shielding capacity of W/EP composites, particularly for low-energy gamma ray (γ) shielding. However, the addition of tungsten reduces the impact strength and tensile properties of the material. Overall, for 300 keV γ-ray, W/EP with 30% tungsten content has comparable shielding capacity to ordinary concrete. W/EP composite materials can serve as shielding materials for low-energy γ-rays.

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“…[8,9] Owing to low specific gravity and easy fabrication processes, as well as tailorable mechanical properties, polymeric materials have become attractive candidates for new generation of radiation shielding materials, [9] among which anti-radiation plexiglass have attracted much attention very recently. [10][11][12] This kind of transparent materials has wide applications in the nuclear radiation protection field, especially to be used as matrix for observation windows.…”

Section: Introductionmentioning

confidence: 99%

Understanding the fracture toughness of gadolinium‐ and lead‐containing plexiglass

Zhang

Liu

et al. 2022

Polymer Engineering & Sci

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Toughened gadolinium‐ and lead‐containing plexiglasses (GLCPs) were prepared via copolymerization using ethoxylated bisphenol A dimethacrylate (BPAxEODMA, x = 2, 4, 10) as comonomer and network regulator. As‐obtained modified GLCPs possessed highly improved toughness, with satisfactory shielding and optical performances. The fracture mechanism was studied then in terms of fracture surface analyses. The results disclosed that both the impact strength and the fracture toughness (KIC) increased with the increase of fatty chain lengths or concentrations of BPAxEODMA, and the surface morphology strongly depended on the fracture processes. A morphological evolution, from mirror region to haze one, and finally to hackle region, was visible on all GLCP samples. However, the morphological characteristics of each region, such as size and roughness as well as the appearance of ring‐banded structure and firework‐like pattern, were completely different. The crack propagation mechanism was utilized to correlate the fracture surface morphology with fracture process of the samples. The relationship between KIC of the samples and their crosslinking networks was well‐built in this way. This work proposes valuable information around fabricating the anti‐radiation GLCPs with high and tailorable mechanical performance.

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Insight into the role of free volume in irradiation resistance to discoloration of lead‐containing plexiglass

Cited by 5 publications

References 45 publications

Probing the Effect of Linear and Crosslinked POE-g-GMA on the Properties of Asphalt

Probing the Effect of Linear and Crosslinked POE-g-GMA on the Properties of Asphalt

The Shielding and Mechanical Properties of Tungsten/Epoxy Composites

Understanding the fracture toughness of gadolinium‐ and lead‐containing plexiglass

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