JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 135
·期 14
·46099
·
IF 1.86
Hui Zhang,Hao Yang,Baoqing Shentu,Songjun Chen,Ming Chen
The ultraviolet (UV)-C ageing behavior of silicone rubber (SiR) incorporated with titanium dioxide nanoparticles (nano-TiO 2 ) was studied under UV-C radiation. The SiR incorporated with nano-TiO 2 displayed excellent physical properties when exposed to UV-C radiation. With the increase of the ageing time, the SiR with nano-TiO 2 showed no significant change in crosslinking density and Shore A hardness. Moreover, compared with the SiR without nano-TiO 2 , the SiR incorporated with nano-TiO 2 also exhibited high retention ratio in tensile properties, especially elongation at break. It was found that nano-TiO 2 was a good ultraviolet light stabilizer during the UV ageing process of SiR and the optimum content of nano-TiO 2 was 2 phr. The results of Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy showed the appearance of O H and CO and the decrease of the intensity of SiC 2 O 2 in SiR samples during the process of UV-C ageing. Based on these results, a possible UV ageing mechanism of SiR could be proposed. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46099.
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2022
·Vol. 40
·期 10
·1183-1192
·
IF 3.815
Zhang Hong-Ming,Han Guang-Ping,Cheng Wan-Li,Liu Shun-Jie,Wang Xian-Hong
High solid content CO 2 -based cationic waterborne polyurethanes (CWPUs) were prepared using CO 2 -polyols as soft segment and N -methyl diethanolamine (MDEA) as hydrophilic group. The resulting stable aqueous dispersion displayed a high solid content of 52% with a low MDEA loading of 3.52 wt%. This novel structural CWPU can provide excellent adhesive strength, whose T-peel strength could reach 173.48 N/5cm, 20% higher than that of ester-based cationic waterborne polyurethane (87.55 N/5cm). The CO 2 -based CWPU film showed only 2 wt% swelling percentage after 240 min immersion in water, and no change was observed during its immersion in 5 wt% sodium hydroxide solution. The tensile strength of CO 2 -WPUs dropped slowly to 91.2% after 480 min immersion in a 5 wt% sodium hydroxide solution, whereas that of ester-based CWPUs dropped quickly to 32% after 240 min and their mechanical properties were lost after 360 min immersion. Meanwhile, the retention of the tensile strength of the CO 2 -CWPUs was 81.5% even after 720 min immersion in 10 wt% H 2 O 2 solution, while it was only ca . 38% for the ester-based CWPUs. These results indicated that the cationic CO 2 -based CWPU may be promising waterborne adhesive with outstanding ageing resistance due to its synergistic effect from carbonate and ether groups of CO 2 -polyol structure.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Heritage Science
·
2024
·Vol. 12
·期 1
·1-9
·
IF 2.6
Liu Jiaojiao,Dong Wenqiang,Yang Junchang,Chen Zhongwei,Cao Jing,Chen Ran
Owing to the instability of gelatine in hygrothermal environments, gelatine-based cultural heritage undergo various deterioration processes, such as cracking, peeling, warping, curling and fracture, posing significant threats to its long-term preservation. Building on previous research, this study investigates the stability of polyol glycidyl ether–gelatine composite films under high-humidity and high-temperature conditions using ethylene glycol diglycidyl ether (EGDE) as a model compound. The hygrothermal ageing properties of EGDE–gelatine composite films are evaluated in terms of macrosize, mesoscopic structure, surface properties and mechanical properties. Results indicate that EGDE enhances the dimensional stability and swelling ratios of the composite films, stabilizes the pore structure and distribution and maintains the hydrophilicity and molecular structural stability under hygrothermal ageing conditions. Furthermore, the incorporation of EGDE leads to superior stress–strain properties of the composite films in such challenging environments. This study provides valuable experimental data for the preparation and conservation applications of gelatine-based cultural heritage materials.
研究领域:
材料科学
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文物保护
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高分子化学
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DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Yinghua Li,Yue Zhang,Fei Su,Yiyan Wang,Linlin Peng,Deze Liu
As the important carriers of environmental pollutants, microplastics have a significant impact on the migration, transformation and toxicology of heavy metals . In this paper, the adsorption behavior of Cr(VI) on PE/PS/PA microplastics under UV irradiation was studied. The research results show that the adsorption capacity of original PA is the strongest, followed by PS and PE . The specific surface area of the aged microplastics increased and new functional groups were formed, so the adsorption of three microplastics for Cr(VI) was stronger than that before aging. The average saturation adsorption of Cr(VI) by PA/PS/PE increased respectively from 730.69 μg/g, 146.11 μg/g and 75.61 μg/g to 736.31 μg/g, 318.75 μg/g and 136.78 μg/g. The Langmuir and Freundlich models showed that the adsorption is more consistent with the Freundlich model, indicating that adsorption is mainly based on multi-molecular layer adsorption on non-homogeneous surfaces. In the Cu–Cr polluted water, Cu has different effects on the adsorption behavior. Cu can promote the adsorption of Cr(VI) by PE and PS , while inhibited the adsorption by PA . In addition, environmental conditions such as temperature, pH and dissolved organic matter also have significant effects on adsorption behavior. Mechanistic analysis confirmed that electrostatic interaction plays an important role. Secondly, based on the surface physicochemical properties of the microplastics, surface complexation and van der Waals forces also significantly enhance the adsorption of Cr(VI) on the aged microplastics.
研究领域:
环境科学
·
毒理学
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DOI
高影响因子
Chemical Biology & Drug Design
·
2025
·Vol. 106
·期 6
·e70214
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IF 3.3
Guihua Jia,Jiayi Li,Abbas Khan,Aman Chandra Kaushik,Diyi Wu,Hongyu Chen,Rongpei Li,Jian Wang,Chen Zhang,Adil Farooq,Xueying Mao,Aamir Mehmood,Weidong Zhang,Heng Wang,Dong-Qing Wei
WGX-50, a previously reported drug candidate for Alzheimer's disease, is derived from Zanthoxylum bungeanum Maxim commonly called Sichuan pepper. Its pharmacological actions for the long run benefit of human health have been extensively investigated. However, in terms of its anti-aging effect, it totally remains unexplored. In this work, WGX-50 was first reported to promote healthy aging in Caenorhabditis elegans with insights from drug target prediction and molecular dynamics simulations. Further investigations have experimentally demonstrated that: Firstly, both daf-16 and skn-1 genes are causative to WGX-50 mediated longevity. WGX-50 failed to extend lifespan upon depletion of these genes in transgenic worms. Their orthologs Foxo1 and Nrf2 were also activated even in D-galactose (D-gal) induced aging and Zmpste24 −/− progeria mice intestines. Secondly, WGX-50 inhibits IIS signaling via downregulating daf-2 , and activating daf-16 and skn-1 genes, which thus enable downstream pro-longevity effectors increasing stress resistance and promoting healthier aging. WGX-50 increased expression levels of sod-3 , ctl-1 , gst-7/8/12/33 , gsto-1 , and heat shock protein genes such as hsp-12.2 , hsp-90 , F44E5.4/0.5 , T05E11.9 and their inducer hsf-1 . In addition, the accumulation of lipofuscin, fat, and reactive oxygen species levels with age was decreased significantly upon WGX-50 supplementation without physiological impairments. Thirdly, in progeria, D-gal and naturally aged mice, WGX-50 is incapable of inducing aging. Senescent genes and SASP factors were not produced at higher levels in livers and small intensities. No impact was observed on key organ indices, blood biochemistry parameters, and bone histomorphometry. WGX-50 perhaps prolongs lifespan through other mechanisms such as reducing fertility, inducing dietary restriction, and improving proteostasis with lowered levels of polyQ35 aggregates. Our findings thus provide primary insights for the potential medical use of WGX-50 in anti-aging and long-term healthcare.
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DOI
PubMed
高影响因子
Cosmetics
·
2025
·Vol. 12
·期 2
·68
·
IF 3.2
Yuan Wang,Xin Nie,Jiangming Zhong,Jing Wang,Lanyue Zhang,Peng Shu
Skin photoageing remains a topic of considerable concern. Retinol (RT) and retinyl palmitate (RP) have shown preliminary therapeutic efficacy; nevertheless, the high irritation associated with RT and the relatively modest efficacy of RP have constrained their broader application. Consequently, this study explored the effects and biosafety of RT and RP in repairing UV-induced skin ageing through a series of in vitro cell experiments, in vitro hemolysis assays, UV-irradiated mouse models, and molecular simulation techniques. The findings revealed that the interaction between RT and RP achieved complementary and enhanced therapeutic outcomes. Specifically, this combination improved the biosafety profile of retinoid formulations, accelerated cell migration rates, and facilitated the activation of the peroxisome proliferator-activated receptor α (PPARα) pathway. Moreover, the action of RT and RP further mitigated epidermal hyperplasia, mast cell infiltration, and the expression levels of interleukin-1β (IL-1β), interleukin-6 (IL-6), and tumour necrosis factor-α (TNF-α), while stimulating the synthesis of type I collagen. Metabolomics and transcriptomics analyses indicated that RT and RP exerted complementary effects through metabolic pathways, significantly elevating the overall therapeutic efficacy. Network pharmacology and molecular docking studies unveiled that the structural similarity between RT and RP was one of the contributors to their enhancement. In conclusion, this study demonstrated that the combined application of RT and RP exhibited marked effects. Through their mutual action, they not only potentiated each other’s therapeutic effects but also achieved complementary and optimised therapeutic outcomes, thereby substantially enhancing the overall efficacy.
研究领域:
皮肤病学
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药理学
·
分子生物学
·
美容药剂学
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衰老研究
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系统生物学
✓ 已验证
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2024
·
IF 6.3
Lvxing Wang,Saifei Xiang,Guangpu Ling,Jianbo Ying,Jiahui Zhou,Jintao Yang
Thermoplastic polyurethane (TPU) has been extensively used in many industrial communities, such as aerospace, electronics, and automotive manufacturing due to its remarkable mechanical strength, elasticity, and excellent chemical resistance. However, flammability and performance deterioration under high-temperature and high-humidity of TPU greatly limit its wider application. Herein, TPU composites with high hygrothermal ageing resistance and flame retardancy are prepared by introducing a molecularly engineered fluorinated thermoplastic polyurethane (FTPU) and synergistic flame retardant. The results show that the presence of FTPU greatly enhances the hydrophobicity of the matrix, impeding the diffusion of the water molecules into the composite, and alleviating the decrease of glass transition temperature and the rise of loss factor resulted from water plasticization effect. As a result, the TPU/FTPU composite shows a much higher mechanical property retention rate after immersing in water of 80 °C for 7 days, as compared to the pristine TPU. In addition, FTPU also exhibits synergistic effect with aluminum diethylphosphinate (ADP) and melamine cyanurate (MCA). The composite containing FTPU, ADP, and MCA (8 %, 4.5 %, and 4.5 %, respectively) can meet UL94 V-0 flame-retardant standard while the counterpart without FTPU shows UL94 V-2 flame retardancy. At the same time, such composite still exhibits tensile strength retention rate of 84.3 % after hygrothermal ageing treatment. This work provides a new modification strategy to simultaneously improve the hygrothermal ageing resistance and flame retardancy of TPU, which also can hopefully inspire the design of other polymers for high performance purpose.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
Nanoscale Advances
·
2025
·
IF 4.6
Lu Zhang,Dongxue Liu,Guiting Du,Long Cai,Wanlei Dai,Yixin Dong,Yongshuai Gong,Huitao Dai,Shengxiong Zhang,Buyi Yan,Jizhong Yao
Perovskite solar cells have made remarkable progress in laboratory-scale efficiency, positioning them as a promising next-generation photovoltaic technology. However, their long-term operational stability under real-world conditions remains a critical barrier to commercial deployment. This study presents a three-year outdoor field investigation of a micro power station composed of 20 perovskite sub-modules (FA0.9Cs0.1PbI3-based, each measuring 30 cm x 40 cm), deployed in subtropical eastern China and fabricated using scalable, industry-compatible processes. The system was continuously monitored over a three-year period to assess its long-term energy output and operational stability under real-world conditions. In parallel, we developed a spectral-accelerated ageing protocol using a tailored ultraviolet to blue-violet light spectrum, with enhanced intensity in the 390-455 nm range. This method enabled a UV dose of 60 kWh m⁻² at 65 oC to effectively replicate approximately two years of outdoor degradation. The excellent agreement between the UV-aged and field-aged performance validates this as a practical and predictive tool for evaluating the outdoor lifetime of perovskite modules. The sub-modules demonstrated outstanding durability, with only a 2.83% decline in power conversion efficiency after three years of continuous outdoor operation. These findings support the implementation of perovskite-specific reliability testing frameworks and align with emerging international standards such as IEC TS 63624-1, highlighting the importance of tailored UV protocols in preparing perovskite technologies for commercial deployment.
研究领域:
材料科学
·
光伏技术
·
能源工程
·
应用物理学
·
环境耐久性研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Functional Materials Letters
·
2021
·
IF 2.17
Jian Su,Xiaohong Zheng,Xianzhong Lang,Rui Han,Hongkun Cai,Jian Ni,Jianjun Zhang,Jianhua Qiu
The solution process is currently the most common method for preparing perovskite solar cells; however, their performance, even when prepared by the same procedure, is variable. One contributing factor is neglecting the ageing time of the perovskite precursor ink. In this study, we studied the correlation between the precursor solution ageing time and the subsequent photovoltaic performance of solar cells. We found that both freshly made and excessively aged precursor solutions resulted in poor perovskite films, exhibiting poor absorption and increased recombination sites. An ageing time of 6 h was optimal, which resulted in photovoltaic devices with greater performance, stability and reproducibility.
研究领域:
材料科学
·
能源研究
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产品关联
DOI
高影响因子
HYDROMETALLURGY
·
2017
·
IF 2.605
Yulong Liao,Zhongwei Zhao
A sulfuric-phosphoric acid leaching process for scheelite was developed. In the process, tungsten exists as a soluble phosphotungstic acid in the leachate. Thus, extracting tungsten from the solution is necessary. Considering the advantages of solvent extraction with oxygen-containing solvents, 2-octanol and tri-butyl phosphate (TBP) were employed to extract tungsten from phosphotungstic-sulfuric acid solutions. The impacts of phosphoric acid and ageing time on the extraction were primarily investigated. It was determined that for H 3 PW 12 O 40 solution with high H 2 SO 4 (49.71 g/L S) content, the WO 3 content in raffinates remained as low as 0.01 g/L after a single stage extraction even if the ageing time increased. However, if such solution contained high H 3 PO 4 (113.95 g/L P), the remaining WO 3 content increased to approximately 0.29 g/L after aged for 0.5 h. And, it further increased to 1.06 and 2.16 g/L after ageing for 24 h and 14 days. It indicated that phosphoric acid and ageing time played an anti-synergistic effect on the extraction. Furthermore, for the solution with abundant H 3 PO 4 aged for 0.5 h, the 31 P NMR results showed there were only the characteristic peak of H 3 PW 12 O 40 ( δ = − 16.24 ppm) and the peak of H 3 PO 4 ( δ = − 0.96 ppm). However, an unknown peak ( δ = − 2.80 ppm) appeared in the spectrum of such solution aged for two weeks and that of its raffinate. This finding implies that the combination reaction between phosphoric and phosphotungstic acid creates another species that is difficult to extract. Therefore, to obtain satisfactory extraction efficiency, the dosage of phosphoric acid should be controlled during the mineral decomposition stage.
研究领域:
冶金学
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化学工程
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DOI
高影响因子
Journal of Rubber Research
·
2024
·Vol. 27
·期 3
·489-499
·
IF 1.2
Liu Yonggang,Hao Wei,Zhang Wentao,Liu Zhaogang,Li Shuai,Hu Yanhong,Wu Jinxiu
A novel accelerator, cerium cysteine (Ce-Cys) was synthesised by double replacement reaction. The complex was characterised by FT-IR analysis, thermal analysis, EDTA titration and elemental analysis, respectively, to determine that the molecular formula of the complex was Ce (Cys) 3 Cl 3 ·3H 2 O. Cure characteristics, crosslink density, mechanical properties and thermo-oxidative ageing of NR compounds were investigated. The research revealed that the vulcanisates containing Ce-Cys manifested high scorch time, outstanding mechanical properties, and better thermo-oxidative ageing properties. Furthermore, based on kinetic calculations, it was concluded that as the amount of Ce-Cys increased, the reactivity of the crosslink precursor increased while the activation energy decreased.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Tongting Wang,Xianchao Feng,Linzi Li,Jun Luo,Xuebo Liu,Jun Zheng,Xiaojing Fan,Yaping Liu,Xinglian Xu,Guanghong Zhou,Lin Chen
The effect of quercetin on chicken breast muscle tenderness and the associated mechanism were investigated. The results indicated that quercetin significantly decreased the shear force and increased the myofibril fragmentation index (MFI). Haematoxylin-eosin-stained images showed that the internal structure of myofibril bundles in the quercetin-treated group was obviously degraded. Transmission electron microscopy showed that the myofibril structure, especially the M-line and A-band, was seriously degraded after quercetin treatment. Furthermore, quercetin treatment increased caspase-3 activity and the Bax/Bcl-2 ratio. The intensity of BiP, XBP1 and p-IRE1/IRE1 ratio increased significantly, and caspase-12 was activated. In addition, quercetin induced the transition from LC3I to LC3II and increased the expression of ATG7 and Beclin-1. The PI3K/Akt/mTOR signalling pathway was involved in the induction of autophagy and apoptosis by quercetin. These results indicated quercetin can promote meat tenderization, and activate apoptosis and autophagy pathways during post-mortem ageing.
研究领域:
动物科学
·
食品科学
·
分子生物学
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）