COMPOSITES COMMUNICATIONS
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2022
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IF 7.685
Xin Li,Hao He,Qiang Liu,Chunxia Zhao,Hongbing Chen
Preparation of inexpensive aerogel via ambient-drying is an important goal in aerogel field. In this study, the sol-gel transformation of polyvinyl alcohol (PVOH)/clay was achieved by γ-ray irradiation, followed by solvent exchanging, 1H, 1H, 2H, 2H-Perfluorodecyltrimethoxysilane (FAS) grafting and ambient-drying to obtain a hydrophobic aerogel. Compared with the freeze-drying method, the specific surface area and pore size distribution of the aerogels prepared by ambient-drying obviously increased, which is more favorable for the grafting of FAS. The water contact angle of the resulting aerogel increased to 139.5° after grafting, while the flammability slightly decreased. The compressive modulus, density and specific modulus of aerogels also increased gradually with the increase of irradiation. When the absorbed dose arrived 100 kGy, the compressive modulus, density and specific modulus reached 25.8 MPa, 0.213 g/cm 3 and 118 MPa·cm 3 /g, respectively. This novel method offers an easy and inexpensive way for fabricating hydrophobic aerogel using water soluble raw materials.
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
RADIATION PHYSICS AND CHEMISTRY
·
2024
·
IF 2.8
Bingbing Qian,Yaodong Dai,Lingfei Xin,Chuqing Yao,Guohui Wang,Shuquan Chang
It is well known that the properties of polyethylene can be improved by irradiation-induced crosslinking the formation of three-dimensional network structures. This paper investigated the effects of gamma irradiation on the mechanical, thermal stability, and γ-rays shielding properties of TAIC-containing γ-rays shielding composites (HDPE/WC-PEW/TAIC). As a result, SEM images showed that agglomerations are alleviated after polyethylene wax (PEW) coated tungsten carbide (WC). The tensile strength and hardness increased from 25.39 MPa to 94 HA to 29.49 MPa and 98 HA after 50 kGy irradiation in vacuum as compared with all composites, while the thermal stability was also improved. The XPS and gel content results showed that the more crosslinked structures generated after 50 kGy irradiated in vacuum between high-density polyethylene (HDPE) and PEW, but irradiation in air is accompanied by the destruction of polymer skeleton. Moreover, the shielding rates of HDPE/WC-PEW/TAIC with thickness of 2 mm and containing 50 wt% WC can exceed 50% and 25% for 137 Cs and 60 Co sources respectively. In summary, HDPE/WC-PEW/TAIC could be an alternative to lead as γ-rays shielding material with excellent mechanical, thermal, and γ-rays shielding properties after 50 kGy irradiation in vacuum.
研究领域:
材料科学
·
辐射物理学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2024
·
IF 4.8
Lingfei Xin,Yaodong Dai,Bingbing Qian,Chuqing Yao,Guohui Wang
The properties of rubber can be changed by controlling the radiation conditions, so as to be suitable for specific application scenarios. This study compares the structure, mechanical properties, cross-linking density, thermal properties, and shielding properties of polyethylene wax/gadolinium oxide/methyl vinyl silicone rubber (PEW/Gd 2 O 3 /MVQ) under different radiation doses and atmospheric conditions. The results showed that the tensile strength of the neutron shielding rubber exhibited growth and subsequently decreased with increasing irradiation dosage, and the tensile strength reached the optimum value of 8.29 MPa after 25 kGy in air. The hardness and cross-linking density of the sample increase with the increase of the dose, and especially the hardness and cross-linking density of the sample irradiated in the air atmosphere at 25 kGy were better than that in the vacuum. The addition of PEW to the rubber significantly increased the thermal neutron-shielding rate, from 74.10% to 86.59% when 36 phr of Gd 2 O 3 was added. The thermal neutron-shielding rate increased from 84.42% to 88.39% when irradiated 50 kGy in air. It was found that the comprehensive performance of the rubber was optimized after irradiation of 25 kGy in the air atmosphere. Highlights The mechanical properties of rubber are enhanced by low-dose irradiation in air. Irradiation of rubber in air is superior to irradiation in vacuum, with optimal results at 25 kGy. Rubber maintains thermal stability at low doses of irradiation. The addition of PEW improves the shielding properties. Rubber retains excellent thermal neutron-shielding properties after irradiation.
研究领域:
材料科学
·
核技术应用
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
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IF 7.489
Jiaming Zhong,Weiyan Li,Jing Qian,Chao Fu,Huiying Chu,Jingjing Xu,Xianghai Ran,Wei Nie
Flexible dielectric materials such as poly(vinylidene fluoride)-based nanocomposites with high energy density are employed for applications in modern electronic and electric systems. In this study, we improve traditional methods by optimizing the interfacial structure , achieving a 34% increase in energy density without reduced discharge efficiency. Herein, a simple solution-cast method is used to prepare poly(vinylidene fluoride- co -trifluoroethylene) nanocomposites filled by γ-methacryloyl-propyltrimethoxysilane (MPMS) grafting barium titanate nanoparticles , forming a class of cross-linking networks by irradiation. More additional interfaces arising from irradiation cross-linking give rise to high discharge energy density, and the small crystalline domain and cross-linking network enhance the charge-discharge efficiency. Furthermore, we find two types of cross-linking centers on the network. One is more beneficial to energy density, and the other is more beneficial to efficiency. Regulating two types of cross-linking centers can balance efficiency and energy density. In summary, this work provides a promising strategy for exploiting advanced flexible dielectric materials to meet application requirements.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
PubMed
高影响因子
POLYMER
·
2024
·
IF 4.1
Jinghan Wu,Tianhao Yang,Peng Dong,Qin Zhang,Ke Wang
Ultrahigh-molecular-weight polyethylene (UHMWPE), with its excellent wear resistance and biocompatibility, has important application as artificial joints. The most commonly used method to improve its wear resistance is to introduce crosslinking through irradiation. However, free radicals are introduced after radiation, which are easy to cause inflammation in the human body. Some antioxidants, such as vitamin E ( V E ), need to be added. However, the addition of V E could reduce the crosslinking density of UHMWPE and worsen the wear resistance of the material. Therefore, obtaining new antioxidants that could eliminate free radicals without affecting or even improving the crosslinking density of materials during irradiation is an important subject worth exploring. In this paper, a kind of natural polyphenol substance, resveratrol (RSV), was introduced as a new antioxidant and crosslinking promoter during irradiation crosslinking of UHMWPE. RSV can better eliminate free radicals than V E and further improve the crosslinking density to obtain UHMWPE materials with excellent oxidation resistance and high wear resistance. The multi-active phenolic hydroxyl structure of RSV molecule provides its free-radical trapping ability, and the appropriate molecular size of RSV may promote the H -type crosslinking of UHMWPE, thereby increasing the crosslinking density. This work provides a new pathway for developing high-performance artificial joint prosthesis materials.
研究领域:
材料科学
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生物医学工程
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Zhongyang Tan,Lijun Chen,Jiming Jia,Tong Liu,Wenjie Zheng,Bang Yao,Xianghai Ran
Irradiation crosslinking has emerged as an efficient and eco-friendly strategy for polymer modification, aligning with green chemistry and sustainable development principles. This study incorporated sulfone-containing bismaleimide (s-BMI) into PVDF films via solution casting method, systematically investigating the effects of s-BMI incorporation and electron beam irradiation (0–228 kGy) on PVDF. FTIR results show that both s-BMI incorporation and the irradiation did not alter the predominant γ-phase formation in PVDF film. After the incorporation of s-BMI into PVDF, the shift of infrared characteristic absorption peaks, the singular melting/crystallization peaks in the DSC curves and the decrease in melting point and crystallization temperature of PVDF were observed, confirming the existence of molecular interaction between s-BMI and PVDF chain. PVDF film even containing 10 wt% s-BMI is homogeneous without defects and has good light transmittance of 54.8 % at 500 nm. SEM results confirm the uniform dispersion of s-BMI in the PVDF film, which indicates the good compatibility of s-BMI and PVDF. The incorporation of only 5 wt% s-BMI and the irradiation at 228 kGy increased the gel content (G c ) of PVDF film from 46.6 % to 66.6 % and thus significantly improved the dimensional stability at high temperatures with the strains at 230 °C of only 5.9 %. This study shows that sulfone-containing bismaleimide is an effective additive with good compatibility with PVDF and can significantly improve the efficiency of PVDF irradiation crosslinking. The irradiation-induced highly cross-linked PVDF films with polar crystalline phases developed in this study exhibits significant potential for application in functional devices operating under high-temperature conditions in the future.
研究领域:
高分子科学
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材料工程
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辐射化学
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核技术
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薄膜技术
✓ 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）