JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2026
·Vol. 34
·期 1
·13
·
IF 5
Song Jie,Liu Chi,Zhang Rong,Tao Jing,Yuan Zhiwen,Chen Lijun
To address the growing demand for biodegradable materials with superior reflective properties across various applications, poly(vinyl carbazole) (PVK), synthesized via radical polymerization, was melt-blended with biodegradable poly(butylene succinate) (PBS). The properties of the resulting composites were comprehensively investigated. The findings indicate that PVK and PBS interact through intermolecular forces. The incorporation of PVK did not affect the crystalline structure of PBS. However, the thermal decomposition temperature of the composite increased, and its thermodynamic properties were enhanced, despite a decrease in crystallinity. Notably, the introduction of PVK significantly improved the reflective performance of the composite. When the addition of PVK reached 5%, the water contact angle of the composite measured 100°, while the water vapor transmission rate was recorded at 14.72 [g·(m²·d)⁻¹]. The degradation rate over a period of six months was found to be 40.09%, and the reflectance was determined to be 92.91%. At this concentration, the effects of pepper color, fruit length, capsaicin content, capsanthin levels, peroxidase activity, and malonaldehyde content were also observed to be most significant. This indicates its potential as an environmentally friendly material for agricultural reflective films.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 20
·52161
·
IF 3.057
Diqin Zhang,Yu Zhao,Zhen Zhang,Bin Guo,Jianhua Zhu,Yan Ye,Yuxia Zhao
Host matrices play an important role in the volume holographic gratings formation of photopolymers. In this study, a series of fluorinated epoxy resin (FTGE) with low refractive index (1.44–1.46) are synthesized and characterized by nuclear magnetic resonance spectra ( 1 H NMR, 19 F NMR) and fourier transform infrared spectra (FTIR). Fluorinated epoxy-amine cross-linked matrices are formed at room temperature and their thermal polymerization properties are investigated through real-time FTIR and thermogravimetric analyses (TGA). Using the fluorinated epoxy-amine as host matrices, holographic photopolymers are fabricated. The influence of different kinds (Prop-FTGE, Buta-FTGE, and Penta-FTGE) and weight ratios (0%, 8%, 16%, and 23%) of FTGEs on holographic performances of the photopolymers are explored. The results show that the sample with 23% Prop-FTGE has the most excellent holographic optical characteristics. 0.5 mm thick sample with 23% Prop-FTGE reaches 91% diffraction efficiency within 80 mJ/cm 2 exposure dosage, and gets a 2000 lp/mm Bragg volume grating with 0.24° angular selectivity. Meanwhile, under a single pulse exposure mode (150–200 ps pulse width, 25 mJ/cm 2 exposure dosage), a grating with 4.4% diffraction efficiency is obtained, which proves the ultrafast response and recording capability of the sample.
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POLYMER
·
2022
·
IF 4.432
Chenghao Li,Jingye Sun,Ulla Sana,Yongjun Ma,Xianyan Ren,Cailin Liu
Herein, carbon dots (CDs) and N,N-dimethylaniline (DMA) were designed as a redox couple for redox-initiated polymerization of N-vinylcarbazole (NVC) under mild conditions. Several ratios of CDs to DMA and various temperatures were adopted to prove the feasibilities of the redox-initiated polymerization. Meanwhile, the CDs as fillers were encapsulated, crosslinked and passivated by the resulting poly (N-vinylcarbazole) (PVK) to form red emissive PVK-CDs composites with a fluorescence quantum yield up to 28.75%, which is significantly higher than that of pristine CDs. In particular, the loading of CDs also enhanced the electron-transfer properties and thermostability of PVK. Hence, this work not only applied CDs to redox-initiated polymerization of NVC so as to prepare CDs modified PVK, but also illustrated the electron-transfer properties of CDs in polymerization and PVK modification. Expectedly, by taking advantages of electron-transfer properties of CDs, it is expectable for redox-initiated polymerization to synthesize more CDs modified polymers for promising applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Sisi Yuan,Yifan Wang,Xiujun Wang,Yongjun Wang,Shuai Liu,Ming Duan,Shenwen Fang
The development of reverse demulsifier is an urgent need for the increasing amount of produced liquid in oilfield. Synthesis of reverse demulsifier containing multiple characteristics is an effective method. In view of this, this study reports a series of cationic polyacrylates as the reverse demulsifiers, which were prepared by using 3-chloro-1-propanol to modify the copolymer of acrylate and N-[3-(dimethylamino) propyl] methacryamide (DMAPMA). The properties and performance tests showed that the PMD1 prepared by using methyl acrylate (MA) as monomer (mass ratio of MA to DMAPMA was 2:1) has well water solubility, high interfacial activity, and the best demulsification efficiency. For treating the produced liquid from an offshore oilfield, demulsification efficiency of PMD1 was 94.7% with 50 mg/L dosage, which was much higher than that of the reagent in use (15.7%). Furthermore, the demulsification mechanism of PMD1 was studied by oil-water partition coefficient experiment, zeta potential measurement, optical tweezers method, elastic modulus measurement, and coalescence kinetics experiment. Prominent demulsification ability of PMD1 was attributed to the synergistic effect of adsorption bridging via cationic group and oil/water interfacial film breaking by acrylate group. The cationic polyacrylate combines the advantages of polyacrylate and polycation reverse demulsifiers, which display a great application prospect in the petroleum industry .
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EUROPEAN POLYMER JOURNAL
·
2023
·
IF 6
Diqin Zhang,Yu Zhao,Bin Guo,Zhen Zhang,Dejiao Hu,Zhen Wang,Jianhua Zhu,Yan Ye,Yuxia Zhao
Photopolymer is well-recognized as an ideal holographic data storage medium. In order to improve the holographic performance of a two-stage photopolymer, five acrylate dendritic monomers ( DM-1/2/3/4/5 ) with high refractive indices (1.590–1.634) are designed and synthesized in this study. Their structures are characterized by 1 H NMR, 13 C NMR, FTIR and HR-MS spectra, and their photopolymerization kinetics are investigated through real-time FTIR. Using these DMs as one recording monomer, a series of photopolymer samples with different formulations are fabricated. The influence of DM-1/2/3/4/5 on the holographic performances of these samples are explored under holographic exposure of a 532 nm laser. The results show that the photosensitivity and angle selectivity of these samples can be improved by adding these DMs. The most excellent holographic characteristics are obtained by a sample with 4% DM-1 . Using it as a data storage medium, a volume holographic grating with high diffraction efficiency of 90% and narrow selection angle of 0.11° is recorded. Moreover, the sample achieves a high dynamic range of 13.7 and a low volume shrinkage of 0.36% after recording 60 holograms through angular-multiplexing with low record/read exposure dose, indicating its great application potential in holographic data storage.
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JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Chenghao Li,Bin Lu,Xinyuan Wang,Yongjun Ma,Xianyan Ren,Cailin Liu,Haijun Yang
The passivation of carbon dots (CDs) are usually implemented through coupling reactions, which requires either specific functional groups on the surface of CDs or multiple steps. In this paper, we propose a feasible method to passivate CDs via in-situ free radical polymerization , which has no dependence on functional groups and thus is suitable for CDs prepared via either bottom-up or top-down route. Taking bare CDs that cut from active carbon by top-down method as an example. When putting acrylic acid , sodium methallyl sulfonate and acrylic phosphate ester as monomers into the bare CDs solution along with ammonium persulfate, stirring at room temperature for 2h, the monomers were polymerized and formed terpolymer-passivated CDs (T-CDs) of which quantum yields (QY) increased obviously. The QY of the bare CDs and the T-CDs were 0.2% and 29.1%, respectively. More interestingly, the bare CDs were found capable of constructing a redox-initiated couple with ammonium persulfate to initiate polymerization. Another example token to further approve the feasibility and universality of “in-situ free radical polymerization” passivation method is our reported poly (N-vinylcarbazole)-passivated CDs (PVK-CDs) that prepared by bottom-up method. The PVK-CDs were synthesized via thermal treatment of a mixture composed of citric acid and N-vinylcarbazole molecules at 300 °C for 2 h. During the process the citric acid was carbonized to provide pristine CDs and N-vinylcarbazole was in-situ polymerized on the surface of the pristine CDs through thermal initiation, which enhances the fluorescence QY up to 40%.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Chunyan Zhang,Jianxin Luo,Yushi Yu,Song Yang,Chunyue Pan,Guipeng Yu
The detection and sensing of trace iron(III) ions is a crucial but challenging task. Herein, we report a facile strategy to build carbazole-based copolymer latexes and films via semi-continuous emulsion copolymerization for the selective detection of iron(III) ions. Carbazole-decorated styrene–acrylic copolymer latexes were synthesized by the copolymerization of styrene , acrylates , and N-vinylcarbazole (NVCz) under mild conditions. The effects of the comonomer composition on emulsion copolymerization and the properties of the copolymer latexes/films were studied. The obtained copolymer latexes exhibit homogeneous spheres through regulating the NVCz content from 0 to 5 wt%. Notably, the copolymers exhibited the characteristic emission of carbazole in both latex and solution form, and the emission intensity can be easily tuned by varying the NVCz content. Surprisingly, higher carbazole content led to differences in the excitation and emission peaks of the latex and solution, resulting from the formation of an excimer in the latex. Moreover, the fluorescence of the latex and film can be selectively and effectively quenched by trace amounts of iron(III) ions in aqueous media. The limits of detection (LODs) of the copolymer latex and film were 1.90 and 1.71 μM, respectively. These results illustrate that the carbazole-decorated styrene–acrylic copolymer prepared employing a facile, inexpensive, scalable and environment-friendly procedure can be used to fabricate high-performance photoelectric devices and high-efficiency fluorescent sensors .
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JOURNAL OF FLUORESCENCE
·
2019
·Vol. 29
·期 6
·1343-1348
·
IF 1.913
Zheng Chao,Xiang Xu
Several fluorescence spectral features in aggregation of carbazole unites have been reported in previous study. Unfortunately, the influence of inner filter effect has not been paid enough attention. In this work, aggregation of carbazole unites resulting from increasing concentration or decreasing solvent affinity, was investigated by fluorescence spectroscopy. Through comparison between the spectra of two aggregation processes, it is found that only intensity ratio of 0–0 transition to 0–1 transition in excitation/emission spectra is sensitive to aggregation states. There is an obvious decrease in that intensity ratio upon aggregation. On the other hand, other spectral features observed in previous research such as intensity decrease in S 0 → S 2 transition and emission quenching in concentration induced aggregation process, should be induced by inner filter effect.
Graphical Abstract
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PubMed
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2019
·Vol. 42
·期 16
·2679-2686
·
IF 2.516
Weixuan Yao,Zhefeng Fan,Suling Zhang
A zirconium terephthalate metal-organic framework-incorporated poly( N -vinylcarbazole- co -divinylbenzene) monolith was fabricated in a capillary by a thermal polymerization method. The optimized monolith had a homogeneous structure, good permeability, and stability. The monolith could be used for the effective enrichment of fungicides through π-π interactions, electrostatic forces, and hydrogen bonds. The potential factors that affect the extraction efficiency, including ionic strength, solution pH, sample volume, and eluent volume, were investigated in detail. The monolith-based in-tube solid-phase microextraction coupled with ultra-high-performance liquid chromatography and high-resolution Orbitrap mass spectrometry was performed for the analysis of five fungicides (pyrimethanil, tebuconazole, hexaconazole, diniconazole, and flutriafol) in environmental samples. Under the optimized conditions, the linear ranges were 0.005–5 ng/mL for pyrimethanil, 0.01–5 ng/mL for flutriafol, and 0.05–5 ng/mL for other fungicides, respectively, with coefficients of determination ≥0.9911. The limits of detection were 1.34–14.8 ng/L. The columns showed good repeatability (relative standard deviations ≤9.3%, n = 5) and desirable column-to-column reproducibility (relative standard deviations 5.3–9.4%, n = 5). The proposed method was successfully applied for the simultaneous detection of five fungicides in water and soil samples, with recoveries of 90.4–97.5 and 84.0–95.3%, respectively.
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ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Jing Huang,Jiexiang Tong,Jing Luo,Ye Zhu,Yao Gu,Xiaoya Liu
In this work, one-pot green synthesis of a novel kind of water-compatible fluorescent molecularly imprinted polymer nanoparticle for selective optosensing of paracetamol was developed via macromolecular assembly of an amphiphilic fluorescent copolymer and in situ photo-cross-linking. Amphiphilic photo-cross-linkable and fluorescent copolymers containing carbazole groups were synthesized and could coassemble with paracetamol (PCM, template molecule) and photoinitiator in aqueous solution. The obtained photo-cross-linkable fluorescent nanoparticles were then cross-linked triggered by UV-irradiation, generating the hydrophilic and fluorescent molecularly imprinted polymer nanoparticles (FMIP nanoparticles) in aqueous media. The whole procedure was carried out at mild working condition, which is facile, green, and energy-saving. The resulting FMIP nanoparticles showed high selectivity toward PCM and obvious fluorescence quenching, induced by template-binding, in water and were a kind of efficient fluorescent chemosensor for the sensing of PCM. A wide linear range over PCM concentration from 4 to 1000 μM with a detection limit of 1.0 μM has been demonstrated using FMIP nanoparticles as chemosensor. Moreover, a rapid response of less than 2 min has been demonstrated. Finally, such a chemosensor based on FMIP nanoparticles was also successfully employed for the detection of PCM in commercial PCM tablets as well as urine samples.
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Nanoscale Research Letters
·
2014
·Vol. 9
·期 1
·1-7
·
IF 2.481
Ji Jianwei,Wang Guan,You Xiaozeng,Xu Xiangxing
Silicon quantum dots (Si QDs) attract increasing interest nowadays due to their excellent optical and electronic properties. However, only a few optoelectronic organic molecules were reported as ligands of colloidal Si QDs. In this report, N -vinylcarbazole - a material widely used in the optoelectronics industry - was used for the modification of Si QDs as ligands. This hybrid nanomaterial exhibits different spectroscopic properties from either free ligands or Si QDs alone. Possible mechanisms were discussed. This type of new functional Si QDs may find application potentials in bioimaging, photovoltaic, or optoelectronic devices.
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JOURNAL OF MEMBRANE SCIENCE
·
2015
·
IF 5.056
Ao Nan Lai,Ke Zhou,Yi Zhi Zhuo,Qiu Gen Zhang,Ai Mei Zhu,Mei Ling Ye,Qing Lin Liu
A series of anion exchange membranes was prepared from the copolymer of 1-vinyl imidazole and N-vinyl carbazole for direct methanol fuel cells (DMFCs). The structure of the membranes was studied using 1 H NMR, scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), and small angle X-ray scattering (SAXS). The thermal stability of the membranes was characterized by thermo-gravimetric analysis (TGA). The ion conductivity, methanol permeability, ionic exchange capacity (IEC), water uptake, swelling ratio, and alkaline stability of the membranes were investigated. It is found that the ion conductivity of the membranes varied from 9.34×10 −2 to 20.28×10 −2 S cm −1 in deionized (DI) water and the methanol permeability varied from 4.5×10 −8 to 12.3×10 −8 cm 2 s −1 at 30 °C. All the as-prepared membranes are stable in a 1.0 M KOH solution at 60 °C for 1400 h due to the polyolefin backbone. A methanol/O 2 single cell evaluation exhibited an open circuit voltage of 0.93 V and peak power density of 125.8 mW cm −2 . Therefore, the as-prepared membranes have great potential for application in alkaline fuel cells .
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