MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2022
·Vol. 223
·期 4
·2100416
·
IF 2.996
Muhua Yuan,Haijun Wang,Huihui Li,Chunlei Yuan,Tong Wang,Haibo Yang
Adding additives is the most convenient and effective way to induce polar poly(vinylidene fluoride) (PVDF) crystals which exhibit excellent ferroelectronic, piezoelectric, and dielectric properties. In this work, a kind of environmentally friendly additive, deep eutectic solvent (DES), is introduced to induce the crystallization of polar phases and accelerate the α -to- γ phase transition, which enables the fraction of γ ( γ ′)-phase crystals to exceed 90% in the PVDF/DES composite containing only 1 wt% DES. The ion–dipole interaction between PVDF and hydrogen bond acceptor in DES induces the polar molecular conformation, thus bringing about the formation of polar phase crystals. However, hydrogen bond donor promotes the dispersion of hydrogen bond acceptor in PVDF matrix, contributing to the flexibility of the composites.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Muhua Yuan,Haijun Wang,Tong Wang,Haibo Yang,Chunlei Yuan
The high dielectric constant of PVDF is very important for its high-performance energy storage dielectrics, but it is more critical to strike a proper balance between high dielectric constant and low dielectric loss. In this work, deep eutectic solvent (DES) and montmorillonite (MMT) have been used together to prepare γ-phase PVDF composite films with excellent dielectric properties. It is found that DES significantly induces crystallization of γ-phase and increases the dielectric constant of the composite due to the incremental ion motion. Meanwhile, DES greatly promotes the stripping and dispersion of MMT layers, which in turn inhibits the long-range ion migration and therefore suppresses the dielectric loss of the composite to a very low level. The dielectric constant of PVDF/MMT/DES composite films can increase to 32, while the dielectric loss remains as low as 0.06 at 1 kHz. Moreover, the synergistic effect of MMT/DES also contributes to enhancing the toughness and optical transmittance of composite films.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENT INTERNATIONAL
·
2025
·
IF 9.7
Mingshu Li,Fuchang Deng,Li Dong,Xiaona Wang,Haiyan Jiang,Siyu Yao,Yuanyuan Chen,Lian Duan,Huamao Du,Guangqiu Qin,Song Tang
Aluminum oxide (Al 2 O 3 ) nanoparticles (NPs) are extensively utilized in the food industry for applications such as food packaging, antimicrobial coatings, food processing equipment, and additives. Despite their widespread use, the mechanisms underlying Al 2 O 3 NP-induced hepatotoxicity and the relationship between their physicochemical properties and toxicity remain inadequately understood. In this study, we explored the hepatotoxic effects of α -Al 2 O 3 and γ -Al 2 O 3 NPs in rats subjected to oral exposure for 28 days. Employing an integrated metabolomics and microbiome approach, we aimed to elucidate the potential mechanisms involved. Our findings revealed distinct hepatotoxic profiles for α -Al 2 O 3 and γ -Al 2 O 3 NPs, potentially mediated by differential interactions with the intestinal microbiome. α -Al 2 O 3 NPs exhibited reduced hepatotoxicity, as evidenced by minimal liver oxidative stress, which may be associated with the upregulation of digestion-related intestinal flora such as Peptococcaceae and Romboutsia , potentially influencing Al 2 O 3 accumulation in the liver. Conversely, γ -Al 2 O 3 NPs demonstrated pronounced hepatotoxicity, characterized by liver histopathological changes and elevated levels of alanine aminotransferase, malondialdehyde, and glutathione. This increased toxicity was correlated with alterations in intestinal flora, including Ruminococcaceae and Exiguobacterium , which affected metabolites like L-phenylalanine and arachidonic acid, potentially contributing to hepatotoxicity. The results underscore the importance of the intestinal microbiome in mediating NP-induced toxicity and determining differences in toxicities of different NP phases. This study provides valuable insights into the differential toxicological impacts of Al 2 O 3 NP phases, paving the way for safer nanomaterial design and application in the food industry.
研究领域:
毒理学
·
纳米生物学
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食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MACROMOLECULES
·
2024
·
IF 5.1
Ruru Wan,Huihui Li,Yuan Yuan,Shouke Yan
Morphology of poly(vinylidene fluoride) (PVDF) single crystals grown in its blends with poly(1,4-butylene adipate) (PBA) has been studied in detail. Another type of γ-PVDF single crystal with morphology differing from that of the previously reported ellipse-shaped ones has been discovered. The newly found γ-PVDF single crystal exhibits a lath-like shape with pronounced overgrowth as well. The lath-shaped γ-PVDF single crystal shows a smaller curvature, weaker (111) electron diffraction spots, but more stable middle sector and ordered arrangement of the overgrowth than the ellipse-shaped one. The evident unstable side sector growth fronts lead to serrated edges and ordered arrangement of overgrowth. Moreover, the presence of large quantities of molten PBA can enhance the mobility of PVDF molecules for diffusing the growth fronts. Thus, a single crystal with smooth edges, such as an ellipse-shaped one, can be obtained. It is further found that though PVDF is miscible with PBA in the molten state because of the polydispersity of components, phase separation can take place in some microdomains of the PVDF/PBA blend, especially for supercooled PVDF. In some domains, the PBA component prefers to segregate over the PVDF, and the diffusion ability of underlying PVDF decreases greatly. As a result, the growth front of the crystal is serrated, and the overgrowth is easy to scroll but arranged more orderly, especially along ±b-axis directions. This indicates that the molten component of low melting temperature changes the diffusion rate of the crystalline process and thus is capable of tuning the morphology of polymer crystals in ultrathin films of binary crystalline/crystalline polymer blends.
研究领域:
材料科学
·
高分子物理
✓ 已验证
产品关联
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2025
·Vol. 8
·期 6
·394
·
IF 21.8
Wu Chongji,Yang Lu,Qian Zhu,Yan Zupeng,Sun Xia,Hu Weiqiang,Ma Zongqing
The conventional sintered W-Ni-Fe alloy encounters challenges in achieving both high strength and plasticity simultaneously, primarily due to its inadequate organizational compatibility. To address this issue, we developed a novel approach combining in situ freeze-drying and straightforward liquid-phase sintering techniques to effectively control the microstructure of 93W-4.9Ni-2.1Fe alloys. The corresponding W-Ni-Fe alloy in this work simultaneously takes into account ultrafine W grains (28.3 µm), low W-W connectivity (CW-W = 0.31), and suitable γ phase volume fraction (20.2%), which is currently difficult for traditional W-Ni-Fe alloys to achieve. The minute dimensions of nanopowder play a crucial role in inhibiting Ostwald ripening and facilitating W grain refinement. Additionally, the extensive surface area of nanopowder enhances capillary penetration, leading to effective homogenization of high γ phase volume. As a result, the freeze-dried W-Ni-Fe alloy simultaneously achieves high strength (1010 MPa) and high plasticity (31%), which provides a new insight for the further development of W-Ni-Fe alloy industries.
研究领域:
材料科学
·
冶金学
·
机械工程
✓ 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
·
材料工程
·
辐射化学
·
核技术
·
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）