Polymer Chemistry
·
2023
·Vol. 14
·期 32
·3718-3728
·
IF 4.6
Chaojie Li,Jiannan Cheng,Yi Zhang,Qing Yu,Zhiru Yuan,Weiwei He,Xiaoguang Bao,Lifen Zhang,Zhenping Cheng
Fluorinated polymers are a class of fascinating materials due to their unique features; however, they have not been applied widely in daily life because of the restricted synthetic methodology and limited availability of various monomers. In this work, main-chain-type semifluorinated alternating terpolymers (SFATs) (AB1)n-co-(AB2)m are prepared by a step transfer-addition and radical-termination (START) polymerization strategy using NaI as the catalyst under irradiation with visible light at room temperature. Herein, 1,6-diiodoperfluorohexane and two α,ω-unconjugated dienes with different structures are used as A, B1 and B2 monomers, respectively. Interestingly, a dual alternating polymerization process can be possible at the beginning of terpolymerization by using dienes with flexible and rigid chains as B1 and B2, respectively. In addition, compared to binary copolymers (AB)n previously synthesized by START polymerization, facile regulation of Tg of the SFATs can be achieved easily either by adjusting the feed ratio of two B monomers or by the removal of the periodic iodine atoms formed in SFATs. Overall, this work provides a guide for the synthesis of a broad range of fluorinated polymers by increasing participating monomers, allowing easier adjustment of the chemical composition and facilitating the integration of desirable properties into fluoropolymers to fulfill diverse requirements in practical application.
研究领域:
高分子化学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2017
·
IF 3.648
Yong Zhou,Yinyan Gong,Yongli Huang,Zengsheng Ma,Xi Zhang,Chang Q. Sun
Solvation of acid, base, and salt is ubiquitously important to all subject areas in chemistry , health care and life science. However, fine resolution of the solvation dynamics, solute-solvent molecular interactions , and solute capability of transforming the hydrogen bond (O:H O, or HB) and surface stress remain great challenge. Incorporating the notion of O:H O bond cooperativity with a strategy of differential phonon spectroscopy (DPS) has enabled resolution on the fraction and stiffness of the solvent HB from the mode of water to the hydration shells upon NaOH, NaI and HI solvation. Results show that Na + and I + ionic polarization shortens the H O bond and stiffens its phonon from 3200 to 3500 cm − 1 in the hydration shells. The H + in the HI solution forms a H ↔ H anti-HB that disrupts the solution network and surface stress. The excessive electron lone pairs of OH – form the O : ⇔ : O super-HB that compresses the network, sharing the same effect of mechanical compression shifting the H O phonon from above 3100 cm − 1 to its below; the solute H O bond performs the same to the H O dangling bond at surface featured at 3610 cm − 1 . The fraction coefficients or phonon abundance transition, f H = 0, f HO ∝ C, and f x ∝ 1-exp(− C/C 0 ) (x = Na + and I − and C the solute concentration) towards saturation, feature the solute capability of HB transformation. Practice not only confirms the essentiality of the H ↔ H anti-HB point fragilization, the O : ⇔ : O super-HB point compression, and the ionic polarization to the performance of the respective HI, NaOH, and NaI solutions, but also demonstrate the power of the DPS that enables fine-resolution of solvation dynamics and solute capabilities.
研究领域:
化学
·
医疗保健
·
生命科学
·
物理化学
·
光谱学
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DOI
高影响因子
GREEN CHEMISTRY
·
2020
·Vol. 22
·期 21
·7468-7475
·
IF 9.48
Shengqin Liu,Huan Feng,Teng Li,Yantao Wang,Nianxin Rong,Weiran Yang
Propionic acid (PA), a valuable chemical widely used in the food and feed industry, is currently produced by the petrochemical industry. Selective production of PA from bio-based lactic acid (LA) is difficult due to the high activation energy of the hydroxyl group at the α position of the carboxyl group. Herein, a metal-free catalytic system for the highly selective transformation of bio-based LA to PA, which was used as the solvent to simplify the separation step, is reported using NaI as the catalyst. Under the optimal reaction conditions, a >99% yield of PA can be obtained from LA. A heat-induced radical-activated hydrogen mechanism was proposed based on the kinetic study and intermediate capture. The metal-free system can be reused five times without any loss in activity, and the PA product is easily separated. In addition, a two-step method using cellulose as the raw material to produce PA was conducted. This strategy offers a green and efficient approach to synthesize PA from biomass resources.
研究领域:
化学工程
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绿色化学
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催化
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DOI
高影响因子
ORGANIC & BIOMOLECULAR CHEMISTRY
·
2016
·Vol. 14
·期 22
·5136-5140
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IF 3.559
Dingyi Wang,Rongxing Zhang,Wei Ning,Zhaohua Yan,Sen Lin
An unprecedented method for the synthesis of β-alkoxy sulfides via a NaI/HBr-mediated three-component oxysulfenylation reaction of alkenes with arylsulfinic acids and alcohols is reported. Furthermore, I2-promoted oxysulfenylation of alkenes using sodium arylsulfinates instead of arylsulfinic acids to synthesise various β-alkoxy sulfides is also described.
研究领域:
有机化学
·
合成化学
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DOI
PubMed
高影响因子
Advanced Materials Technologies
·
2026
·
IF 6
Ying Chu,Liang Chen,Chen Yu,Yuan Xie,Jia Jia,Aifei Wang,Tianshi Qin
Cuprous (Cu(I)) halide clusters have garnered significant attention for light-emitting devices (LEDs) due to their high photoluminescence quantum yields and broadband emission, both originating from self-trapped excitons. However, their practical implementation is impeded by poor solution processability and challenges in fabricating high-quality films. Herein, we report a facile, scalable mechanochemical synthesis of highly luminescent Cu(I) halide clusters via direct ball milling under ambient conditions. Notably, the incorporation of sodium iodide enhances the dispersibility and solution processability of these clusters without deteriorating their emission properties, enabling the preparation of stable colloidal dispersions and the one-step solution deposition of smooth, uniform films. The resultant electroluminescent devices achieve a peak external quantum efficiency of 5.9% and exhibit uniform yellow emission over a large area of 5 × 5 cm 2 . Through judicious selection of charge-transport layers, we further demonstrate broadband white electroluminescence with voltage-tunable color temperature. Our strategy provides a practical pathway to efficient, scalable, and low-toxicity Cu(I) halide cluster LEDs, while offering key design principles for developing high-performance solution-processable emissive materials in next-generation solid-state lighting.
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产品关联
DOI
高影响因子
TETRAHEDRON LETTERS
·
2018
·Vol. 59
·期 51
·4458-4461
·
IF 2.125
Zhengjiang Fu,Yongqing Jiang,Ligao Jiang,Zhaojie Li,Shengmei Guo,Hu Cai
A simple and practical Cu-catalyzed decarboxylative iodination has been well established under aerobic condition, which provides a useful method to synthesize aryl iodides in moderate to good yields with the use of (hetero)aryl carboxylic acids and NaI as starting materials. Thiabendazole has been prepared via a three-step procedure to show synthetic practicability of the protocol.
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DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Jiaojiao Chen,Wanjing Cui,Yafei Guo,Lingzong Meng,Hongfang Hou,Tianlong Deng
Densities of the binary systems (NaI + H2O) and (NaIO3 + H2O) were measured by an accurate Anton Paar Digital vibrating-tube densimeter at temperature intervals of 5 K ranging from 283.15 to 353.15 K at ambient pressure and molalities of sodium iodide and sodium iodate ranging from 0.16764 to 2.15208 and 0.02252 to 0.15952 mol kg–1, respectively. Based on the experimental density data of the binary systems (NaI + H2O) and (NaIO3 + H2O), thermal expansion coefficient (α) and apparent molar volume (Vϕ) are obtained using an empirical equation calculation, and the diagram for the relationship between temperature and molality was plotted. According to the Pitzer ion-interaction model of the apparent molar volume, Pitzer single salt parameters β(0)v M.X, β(1)v M.X, and Cv M.X and their correlation coefficients ai of the temperature-dependent equation f(i, p, T) = a1 + a2ln(T/298.15) + a3(T – 298.15) + a4/(620 – T) + a5/(T – 227) (where T is the temperature in Kelvin and ai values are the correlation coefficients) for NaI and NaIO3 were first obtained by the least-squares method. The obtained apparent molar volumes agree well with the experimental values, and these results indicated that the single salt parameters and the temperature-dependent formula obtained in this work were reliable.
研究领域:
化学
·
物理化学
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DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2023
·
IF 7.4
Si-Qi Pan,Ping Luo,Jia Chen,Tairui Wu,Bin Xu,Fushan Chen,De-Yin Wu,Bin Ren,Guo-Kun Liu,Jianwei Xie,Pengxiang Xu,Zhong-Qun Tian
Reagent purity is crucial to experimental research, considering that the ignorance of ultratrace impurities may induce wrong conclusions in either revealing the reaction nature or qualifying the target. Specifically, in the field of surface science, the strong interaction between the impurity and the surface will bring a non-negligible negative effect. Surface-enhanced Raman spectroscopy (SERS) is a highly surface-sensitive technique, providing fingerprint identification and near-single molecule sensitivity. In the SERS analysis of trace chloromethyl diethyl phosphate (DECMP), we figured out that the SERS performance of DECMP is significantly distorted by the trace impurities from DECMP. With the aid of gas chromatography-based techniques, one strongly interfering impurity (2,2-dichloro-N,N-dimethylacetamide), the byproduct during the synthesis of DECMP, was confirmed. Furthermore, the nonignorable interference of impurities on the SERS measurement of NaBr, NaI, or sulfadiazine was also observed. The generality ignited us to refresh and consolidate the guideline for the reliable SERS qualitative analysis, by which the potential misleading brought by ultratrace impurities, especially those strongly adsorbed on Au or Ag surfaces, could be well excluded.
研究领域:
分析化学
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表面科学
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材料科学
·
光谱学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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