Antioxidants
·
2024
·Vol. 13
·期 8
·894
·
IF 6
Shenshuai Wang,Yingjie Huang,Weiye Sun,Xufeng Lin
Hindered phenol antioxidants and benzophenone UV absorbers are common polymer additives and often used in combination applications to enhance the anti-aging performance of polymer materials. This study primarily aims to incorporate hindered phenol and benzophenone structures into a single molecule to develop a multifunctional polymer additive with good anti-aging performance. Thus, a novel potential polymer anti-aging agent, namely 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid 3-(4-benzoyl-3-hydroxyphenoxy)propyl ester (3C), was synthesized using 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid, 3-bromo-1-propanol, and 2,4-dihydroxybenzophenone as raw materials by two-step procedure. The structure of compound3Cwas characterized by nuclear magnetic resonance (NMR), high-resolution mass spectrometry (HRMS), Fourier-transform infrared (FT-IR) spectroscopy, and X-ray single crystal diffraction. Its thermal stability and UV resistance were assessed using thermogravimetric analysis (TGA) and UV absorption spectroscopy (UV). The compound3Cas an additive was incorporated into the preparation of polyolefin elastomer (POE) films. The anti-aging performance of POE films was evaluated by measuring parameters such as oxidation induction time, melt flow index, transmittance, and infrared spectra of the artificially aged POE films. The results indicate that the compound3Cexhibits a promising anti-aging performance in both thermo-oxidative aging and ultraviolet aging tests of POE films and is a potential polymer anti-aging agent.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
·
2021
·Vol. 28
·期 2
·405-417
·
IF 1.993
Zhiping Xu,Zhenhua An,Yan Ye,Rui Yang
Owing to the widespread use of polypropylene (PP) nanocomposites, their stability in the environment is becoming increasingly relevant. Accordingly, a systematic study of the relationship between the characteristics of inorganic nanofillers and the environmental aging behavior of PP is necessary to determine the service life of PP nanocomposites in outdoor environments. Therefore, in this study, we systematically investigated the effects of the chemical composition, particle size, crystalline form, and amount of inorganic filler (CaCO 3 , Al 2 O 3 , SiO 2 , and ZnO) on the outdoor aging behavior of PP. The results of outdoor aging experiments showed that the filler composition affects the aging behavior of PP. It was found that SiO 2 and ZnO nanoparticles accelerate and retard the outdoor aging of PP, respectively. In addition, PP composites containing inorganic fillers with relatively large particles or more stable crystalline forms exhibit relatively slow aging. In the case of the fillers other than ZnO nanoparticles, increasing the filler content accelerates the outdoor aging of PP. The evolution of cracks in the exposed surfaces of PP composites during outdoor aging was observed by scanning electron microscopy. The CO 2 generated by PP composites during in situ gaseous degradation product detection corresponds well with the results of the outdoor aging experiments. This study elucidates the effects of inorganic fillers on the outdoor aging behavior of PP.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2022
·
IF 9.988
Chengxin Guo,Lingling Wang,Daning Lang,Qianqian Qian,Wei Wang,Ronglan Wu,Jide Wang
This study evaluates the “vector” effects of different microplastics (MPs) on coexisting pollutants. The adsorption of tetracycline was studied on biodegradable plastics poly(butylene adipate- co -terephthalate) (PBAT) and non-biodegradable plastics polystyrene (PS), polypropylene (PP), and polyethylene (PE) after UV aging and chemical aging. The physicochemical properties of PBAT changed more obviously after UV radiation and chemical aging comparing to PS, PP and PE. Pores and cracks appear on the surface of aged PBAT. The crystallinity increased from 29.2% to 52.62%. In adsorption experiments, pristine and aged PBAT had strong vector effects on the adsorption of tetracycline than PS, PP and PE. The adsorption capacity of tetracycline on PBAT was increased from 0.7980 mg g −1 to 1.2669 mg g −1 after chemical aging. The adsorption mechanism indicated that electrostatic interactions and hydrogen bonds contribute to the adsorption process. In addition, for the adsorption of tetracycline on PS, π-π interaction was the main cause, and the adsorption mechanism was not considerably changed by aging. In conclusion, this study demonstrates that biodegradable plastics have substantial vector effect on coexisting pollutants at the end of their life cycle, this contributes to assessment of the risk from microplastic pollution.
研究领域:
环境科学
·
污染生态学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Na Wang,An Gu,Guanghua Li,Yong Lei
Boiled tung oil is the commonly used drying oil in Chinese cultural relics, and light radiation, temperature are the important factors leading to its aging. In order to investigate the photo and thermal aging behavior of boiled tung oil and determine the characteristic parameters to evaluate its aging degree, micro-UV/Py-GC/MS system has been applied in the present work to monitor the volatile aging products released by boiled tung oil film, to obtain high aging degree boiled tung oil film in short time and to investigate its composition change in different aging degree. Research results showed that volatile products released by boiled tung oil film during UV irradiation and 60 ℃ were mainly series of aldehydes, ketones, carboxylic acids and hydrocarbons with small molecule. With increase of aging time, the type of volatile products remain unchanged, but their amount gradually decreases until cannot be detected. Pyrolytical products of unaged and aged boiled tung oil is the same, but with the increase of aging degree, relative content of glycerol, dicarboxylic acids and azelaic acid in boiled tung oil film gradually increased, while the relative content of oleic, linoleic and eleostearic acid, as well as the content ratio of mono-carboxylic acids to di-carboxylic acids gradually decreased. Changes of volatile and pyrolytical products during aging process were summarized to evaluate the aging degree of boiled tung oil used in cultural relics. Boiled tung oil used in two lacquerware samples collected from the same carved lacquer panel from Fuwang Ge in the Forbidden City, and two polychrome samples separately collected from the inner and outer eave of Yanxi Tang in the Forbidden City were investigated, the aging degree evaluation results of boiled tung oil in historical samples have further confirm the reliability of summarized parameters. Research results of the present work can provide scientific support for the conservation and restoration of related cultural relics, and also lay a foundation for the in-depth study of the photo and thermal aging mechanism of boiled tung oil.
研究领域:
文物保护
·
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Chongzheng Zhu,Zhongpu Xu,Henglong Zhang,Zhichao Wang,Deqi Li,Ningyi Su,Dongmei Zhang
To enhance the long-term service performance of asphalt pavements under aging conditions, this study investigated the effects of nano-CeO 2 /montmorillonite (MMT) composites at different ratios (CM0.2, CM0.5, CM1.0) on the rheological properties and microstructural characteristics of asphalt subjected to various aging protocols. By employing dynamic shear rheological (DSR), gel permeation chromatography (GPC), and atomic force microscopy (AFM) tests, the performance changes of nano-CeO 2 /MMT composite-modified asphalt (CMMA) under thermal-oxidative aging (rolling thin film oven (RTFOT, 163 ℃, 85 min), pressure aging vessel (PAV, 100 ℃, 2.1 MPa, 20 h)) and ultraviolet (UV, 60 ℃, 6 d) aging was systematically analyzed. The CM0.5 composite demonstrated superior anti-aging efficacy: the UV absorption capability of CeO 2 synergized with the lamellar physical barrier effect of MMT to effectively inhibit oxidative cross-linking of asphalt macromolecules. Compared to the base asphalt, CMMA with CM0.5 (CMMA0.5) exhibited significantly enhanced rheological properties, including higher complex modulus and rutting factor, along with outstanding high-temperature deformation resistance. Following UV aging, CMMA0.5 showed a 44 % reduction in the complex modulus aging index (CMAI) at 60 °C compared to the base asphalt. AFM results further confirmed the stability of the "bee structure" in CMMA0.5 before and after UV aging, with minimal variations in surface roughness, modulus, and adhesion force. The nano-composite modification strategy proposed here achieves functional complementarity between CeO 2 ’s UV absorption and MMT’s physical barrier, offering an innovative solution for improving asphalt pavement durability.
研究领域:
材料科学
·
道路工程
·
高分子化学
·
表面科学
·
环境耐久性
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2019
·
IF 2.846
Lei Chen,Ding Wang,Jiadao Wang,Duan Weng,Li Cao
The CeO 2 -TiO 2 (CeTi) and CeO 2 /WO 3 -TiO 2 (CeWTi) catalysts were prepared by sol-gel method. The as-prepared catalysts were hydrothermally treated at 760 °C for 48 h in air containing 10 vol% H 2 O to obtain the hydrothermal aged catalysts. The sulfur aged catalysts were treated at 400 °C with 100 ppm SO 2 , 10% water vapor, air balance for 48 h and catalysts. The powder X-ray diffraction (XRD) and Raman results indicate that the crystallization of hydrothermal aged catalysts is more serious than sulfur aged catalysts. In addition, tungsten species can stabilize the CeTi catalyst from grain growth. According to the results of in situ diffuse reflectance infrared Fourier transform spectra (DRIFTS), temperature-programmed desorption of ammonia (NH 3 -TPD), H 2 temperature-programmed reduction (H 2 -TPR) and ammonia oxidation , the aging process leads to loss of surface area, redox properties, surface acidities and surface ceria concentration, especially for the hydrothermal aging. The NH 3 -NO/NO 2 SCR performances of sulfur aged catalysts are better than that of hydrothermal aged catalysts. Compared with CeTi catalyst, the addition of tungsten inhibits the crystallization of catalyst. So that more acid sites and active sites are retained. This is also the reason why tungsten addition improves the NH 3 -NO/NO 2 SCR performance of CeTi catalyst.
研究领域:
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Hua Ma,Haohao Liu,Feng Tian,Bingbing Gao,Lijun Liang,Yang Liu,Peng Gao,Xingzhong Cao,Yunxiang Bai,Chunfang Zhang,Liangliang Dong
Membrane separation technology plays a critical role in the utilization of helium (He) resources. Yet, the performance of current polymer membranes is hindered by a trade-off between permeability and selectivity, as well as by physical aging. Solving these problems is vitally crucial for the industrial application of He separation. This study reported controllable thermal crosslinking of alkynyl-based polyimide membrane (EBPA-TB-TC) to improve He permeability and anti-aging performance. The resulting covalently crosslinked structures conferred thermal and chemical stability to the membranes, as well as increased microporosity. It led to a notable 'anti-trade-off' effect and improved anti-aging characteristics. An optimized EBPA-TB-TC membrane exhibited a superior combination with a He permeability of 61.14 Barrer and an He/N 2 selectivity of 72.78. Crucially, mixed-gas He/N 2 (1:1, 50/50) separation results over 50 days revealed minimal reductions in He permeability (1.34 %) and He/N 2 selectivity (2.95 %), indicating fantastic anti-aging performance. These findings demonstrated the significant potential of thermally cross-linked EBPA-TB-TC membrane in long-term stable helium separation.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2025
·
IF 6
Jiayu Li,Yujie Dai,Zhicheng Pan,Jing He,Lin Chang
Micro-nano plastics aging is crucial as it determines the environmental fate of each plastic particle, yet few studies involved in situ aging of nanoplastics. Herein, we utilized nanosphere lithography combined with goldnanorod assembly to prepare a moth-eye mimic plasmonic substrate featuring excellent SERS performance. The substrate was applied to in situ characterize the degradation process of PS nanoplastics during UV aging. Raman spectra evidence that the substrate is sensitive to superficial chemical changes of PS nanoplastics at initial stage during 24 h of continuous UV aging. The disruption of the benzene ring skeleton, the oxidation of the side chains of PS nanoplastics during UV aging, and the presence of oxidized methylene straight chains were identified. Practical applications in environmental sample revealed the chemical changes of PP, PS, and PE, which confirm the great potential of this SERS substrate for aging studies of nanoplastics.
研究领域:
环境科学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Pengyu Zhang,Jin Fan,Xiaoyun Xu,Zibo Xu,Yulu Yu,Ling Zhao,Hao Qiu,Xinde Cao
Zero-valent iron-embedded biochar (ZVI/BC) is considered as an effective material for arsenic (As) immobilization in soil, but the stability of As after remediation against aging remains unknown. Herein, the effects of dry-wet and freeze-thaw aging on the immobilization of As in two As-contaminated soils amended by ZVI/BC were evaluated. ZVI/BC showed high immobilization capacity for As-contaminated soils with an over 82% decrease of bioavailable As, mainly due to the As-Fe co-precipitation accompanied with ZVI oxidation. The aging of dry-wet and freeze-thaw had an opposite effect on the bioavailability of As. After 35 rounds of dry-wet aging, bioavailable As concentration increased from 1.25‐9.50 to 1.83‐21.75 mg/kg, because of the oxidation dissolution of ZVI and the formation of mobile reduced As(III). By contrast, the crystallization of amorphous iron with the structural incorporation of sorbed As and the oxidation of As(III) into stable As(V) occurred during the 35 rounds of freeze-thaw aging, leading to the decrease of bioavailable As concentration from 9.50‐1.25 to 5.42‐0.45 mg/kg. Our results revealed that the stability of soil As after remediation by ZVI/BC varied with the different aging process, which needs more consideration for the long-term soil As immobilization in the different whether areas.
研究领域:
环境科学
·
土壤学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Hao Yang,Ping He,Henglun Cheng,Baoqing Shentu
To promote the anti-aging performance of thermoplastic vulcanizates (TPVs) versus ultraviolet (UV)/O3 exposure, a nano-TiO2-loaded antioxidant (TiO2-KH570-MB) was prepared by a thiol–ene reaction between 2-mercaptobenzimidazole (MB) and modified nano-TiO2 (TiO2-KH570). Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and thermogravimetric analysis demonstrated the chemical linkage between MB and modified nano-TiO2, and the loading amount of MB was approximately 5.19 wt %. The contact angle test showed that the surface hydrophobicity of TiO2-KH570-MB was significantly increased due to the immobilization of MB. Scanning electron microscopy revealed that TiO2-KH570-MB was uniformly distributed in the TPV matrix. The anti-aging property of TPV compounds was tested in the device with high-intensity ultraviolet radiation and high-concentration ozone. The effects of UV/O3 comprehensive aging on the TPV compounds were evaluated by means of the variations of surface morphology, tensile test, hardness, gel content, and carbonyl index with aging time. On the basis of the aging behavior, we concluded that TPV/TiO2-KH570-MB exhibited excellent stability against UV/O3 aging, due to the homogeneous dispersion, low level of migration, and low volatility of TiO2-KH570-MB.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
IRANIAN POLYMER JOURNAL
·
2023
·
IF 3.1
Wan Songhan,Chen Songbo,Yang Qingshan,He Xianru
The migration of commercial rubber antioxidants causes significant environmental pollution; thus, environmentally friendly antioxidants are receiving increasing attention in rubber production. Herein, we prepared a green anti-aging composite filler called ZPa via an in situ intercalation polymerization procedure of polydopamine (PDA) on zirconium phosphate ( α -ZrP) for realizing the enhancement of mechanical performance and aging resistance in nitrile butadiene rubber (NBR). Different from commercial antioxidants, the biocompatibility of α -ZrP and PDA made ZPa non-toxic and harmless to the environment. Results showed that PDA increased the interlayer spacing of α -ZrP and promoted its dispersion in matrix. The best reinforcement effect of the composite filler on NBR can be achieved with 5 phr of ZPa. The tensile strength of ZPa/NBR increased by 51% compared to the neat NBR. The outstanding free radical capture capability and the barrier function of ZPa greatly enhanced the ability of NBR to resist aging. The mechanical properties after aging of ZPa-5/NBR were 64% and 21% higher than those of the neat NBR in tensile strength and elongation-at-break values, respectively. The present work also exhibited that ZPa/NBR showed powerful thermal oxidative stability. In brief, ZPa enabled NBR highly competitive for mechanical performance and anti-aging property, which is expected to be utilized in the field of “green” rubber. Graphical Abstract
研究领域:
材料科学
·
环境科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
E-POLYMERS
·
2023
·Vol. 23
·期 1
·
IF 3.7
Meng-Zhen Zhou,Hao-Ran Wang,Xing Guo,Yan-Chan Wei,Shuangquan Liao
The oxidation of natural rubber (NR) leads to a decrease in mechanical properties, even resulting in failure of NR products. Many studies focusing on this single factor have failed to fully elucidate the impact of tropical island environment on NR properties. Based on this concern, the synergistic effect of thermal oxygen and ultraviolet (UV) aging on NR was systematically studied. The results revealed that thermal oxygenation can promote UV aging, which leads to the appearance of surface cracks and deepening of color. With the extension of aging time, the mechanical properties of NR correspondingly decreased. Besides, to deeply understand the mechanism of the synergistic effect of thermal oxygen and UV aging on NR, we selected squalene to simulate and analyze the molecular structure changes in NR. Based on these results, a possible synergistic effect of thermal oxygen and UV aging mechanisms on NR could be proposed.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）