PROGRESS IN ORGANIC COATINGS
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2025
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IF 7.3
Le Ma,Yang Hou,Jun Nie,Xiaoqun Zhu
The introduction of substituents affects the planarity of the molecule, resulting in different physical and chemical properties. This study synthesized four one-component visible light photoinitiators with different substituents derived from 1-naphthylamine. They were amine-free (BTX), primary amine (BTX-A), secondary amine (BTX-MA), and tertiary amine (BTX-DMA). The photophysical and photochemical properties were explored using UV–visible absorption spectroscopy combined with DFT theory computational simulations. They had excellent absorption properties in the visible light range ( ε : 3200–6300 L mol −1 cm −1 ). The structure of amine substitutions in the initiators showed different redshift phenomena. The maximum absorption wavelength of BTX in the visible region is 388 nm; only a 7 nm red shift occurred for the maximum absorption wavelength of BTX-DMA. While BTX-A had a maximum absorption wavelength of red shifting by 41 nm， the red shift for BTX-MA was about 53 nm, and its UV absorption tail extended to 520 nm. This phenomenon was known to be the result of the combined effect of electronic donor and molecular planarity according to the DFT theoretical calculations. The photopolymerization kinetics of four initiators used for double bond monomers was investigated by real-time FT-IR. The results indicated that polymerization could occur for all the designed systems; the highest double bond conversion could reach 92 % when BTX-DMA was used as a visible-light photoinitiator for the monomer of 2-hydroxyethyl acrylate (HEA).
研究领域:
材料科学
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化学工程
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光学
✓ 已验证
产品关联
DOI
高影响因子
HIGH PERFORMANCE POLYMERS
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2024
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IF 1.8
Yaqing Wen,Ge Zhu,Jie Li,Xingzhong Fang,Guofei Chen
Two series of novel poly(ester-amide-imide)s (PEsAIs) with pendant phthalimide side group were synthesized by copolymerization of phthalimide-hydroquinone bis(trimellitate anhydride) (PI-TAHQ), p-phthaloyl chloride (TPC) and other fluorinated monomers using the two-step method. These PEsAIs had glass transition temperatures (Tgs) in the range of 228 °C–296°C and coefficients of thermal expansion (CTEs) of 18–55 ppm·K−1. These films had good mechanical properties with tensile modulus of 3.7–5.7 GPa, tensile strengths of 92–153 MPa and elongations at break of 2.2%–8.3%. All films displayed good transparency with transmittances at 400 nm (T400nm) of 43%–79% and transmittances at 850 nm (T850nm) exceeding 89%, and these PEsAIs were amorphous. Especially, PEsAI-d-60 presented the best comprehensive performance with Tg of 296°C, low CTE of 18 ppm·K−1 and high transmittance (T400nm of 79%, T850nm of 91%), which exhibited the potential of this novel poly(ester-amide-imide) containing pendant phthalimide substituent in optical transparent materials.
研究领域:
材料科学
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高分子化学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
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2025
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IF 4.7
Yizhi Chen,Zhiyi Wang,Xiaofan Yang,Zifang Guo,Weiqun Shi,Peng Zhang,Mingzhang Lin
2,9-Diamide-1,10-phenanthroline (DAPhen) extractants constitute a novel class of tetradentate agents due to their high affinity for actinides and their adherence to the CHON principle. In this investigation, we explored the performance in extraction and the capabilities for An/Ln separation of a series of N,N′-diethyl-N,N′-diethyl-2,9-diamide-1,10-phenanthroline (Et-Et-DAPhen), N,N′-dioctyl-N,N′-dioctyl-2,9-diamide-1,10-phenanthroline (Oct-Oct-DAPhen), N,N′-diethyl-N,N′-ditolyl-2,9-diamide-1,10-phenanthroline (Et-Tol-DAPhen), and N,N′-dialkyl-N,N′-diphenyl-2,9-diamide-1,10-phenanthroline (R-Ph-DAPhen, R = H, Me, Et, Oct) extractants featuring diverse amide substituents. Combining extraction experiments with theoretical calculations reveals that substituting ethyl with octyl enhances the extraction efficiency. Moreover, phenyl amide substituents exhibit superior extraction properties compared with alkyl counterparts. Augmenting the alkyl carbon chain length of the amide substituent proves beneficial for improving extraction performance. In contrast to alkyl, tolyl substituents demonstrate an enhanced favorability for extraction. By comparing the extraction performance and separation performance before and after irradiation, combined with theoretical calculations, it reveals that appropriately increasing the carbon chain length of the amide substituent can enhance radiation stability. Additionally, the incorporation of phenyl-substituted alkanes contributes to the heightened radiation stability of the extractant. This work promises to contribute to the structural design and performance optimization of novel extractants for An–Ln separation, thereby facilitating advances in extraction and separation methodologies.
研究领域:
核化学
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分离科学
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锕系与镧系化学
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辐射化学
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配位化学
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有机合成
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）