Journal of Coatings Technology and Research
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2023
·Vol. 20
·期 5
·1529-1539
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IF 2.3
Jiang Shuangshuang,Bai Jue,Ying Xiaogang,Han Jianlin,Zhu Kai,Mao Lianshan
An aqueous dispersion of carbon black is crucial in industrial coatings. In this manuscript, a hyperdispersant IBOMA-MPEGA-DMAM (IMD) has been synthesized using isobornyl methacrylate (IBOMA), polyethylene glycol monomethyl ether acrylate (MPEGA), and N, N -dimethyl acrylamide (DMAM) as monomers via a free radical polymerization method, which is used to improve the dispersibility of an aqueous dispersion system of carbon black. The molecular structure and performance stability of IMD were investigated through comprehensive characterizations of FTIR, GPC, particle size distribution and TEM. When the molar ratio of the monomers IBOMA:MEPGA:DMAM is 5.5:8.3:9.7, the obtained hyperdispersant shows good dispersibility. When the optimal dosage of dispersant IMD was 8%, the viscosity of carbon black slurry was as low as 18.6 mPa·s and the average particle size of carbon black was 275 nm. Furthermore, the stability of the prepared carbon black slurry was better than that of the two commercial dispersants.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
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2013
·Vol. 51
·期 7
·1559-1564
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IF 3.543
Xiao-Hui Liu,Yun-Hai Yu,Di Jia,Bo-Wen Cheng,Fei-Jun Zhang,Hui-Na Li,Peng Chen,Shan Xie
Single electron transfer living radical polymerization of methyl methacrylate catalyzed by the in situ prepared Cu(0) at ambient temperature was first examined using various metallic powders, including Zn(0), Ni(0), Mg(0), and Fe(0). Importantly, the polymerization initiated with Ni(0)/EBiB/CuBr 2 /PMDETA system exhibited optimal living/controlled nature and generated polymers with polydispersity index as low as 1.04 for 75.27% conversion and controlled molecular weights close to theoretical ones. A wide of range of Cu(II) salts were also investigated as catalyst sources instead of CuBr 2 . The recycling of Ni(0) was very convenient due to its magnetic property, which enables its extensive application. © 2013 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013
研究领域:
高分子化学
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材料科学
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催化化学
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有机合成
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功能材料
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
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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%.
研究领域:
材料科学
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化学
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产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
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2015
·
IF 2.358
Xuying Nan,Yi Huang,Qinguo Fan,Jianzhong Shao
Dye-linked initiators consisting of erythrosine B as a chromophore and ethyl 4-dimethylaminobenzoate as an electron donor linked by a different number of methylene units were prepared to achieve efficient photoinitiators of free radical polymerization in a visible-light region. The relative photoinitiating efficiencies of novel photoinitiators in photopolymerization of acrylates were evaluated. The results showed that the photoinitiating system composed of the dye-linked dyad with short methylene unit chain and diphenyliodonium salt exhibited a remarkable increase in the photoinitiation ability compared to unlinked three-component system. The enhancement mechanism aroused by the onium salt was investigated. These results showed that the excellent initiating efficiency of this system could be attributed to the favorable intramolecular photoinduced electron transfer and the close distance between reaction components caused by electrostatic interactions. This result demonstrated the importance and potential of the linked photoinitiator in the design of new efficient photoinitiators.
研究领域:
材料化学
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光化学
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产品关联
DOI
高影响因子
SUPRAMOLECULAR CHEMISTRY
·
2015
·
IF 2.394
Bo Xiao,Ying Fan,Ning-Ning Ji,Xiao-Jie Cheng,Chuan-Zeng Wang,Jia-Jia Zhou,Sai-Feng Xue,Zhu Tao,Qian-Jiang Zhu
Using the one-pot, direct strategy reported by Su and co-workers, we have synthesised a series of cucurbit[n]urils (Q[n], n = 5–8) and alkyl-substituted cucurbit[6]urils (SQ[6]s) anchored on polymers. Acrylamide, as a typical monomer, was used to synthesise a series of Q[n]s (n = 5–8) and SQ[6]-anchored polyacrylamides (PAMs) using a persulfate salt as initiator and oxidant. The Q[n]s (n = 5–8) and SQ[6]-anchored PAM samples have been characterised by 1H NMR, 1H NMR titrations of probe guests, Fourier-transform infrared and thermogravimetric analyser. The results confirmed that PAM chains had been successfully grafted on the back of the Q[n]s (n = 5–8) and SQ[6]s through an in situ radical polymerisation approach. It was further confirmed that the hydrophobic cavities of the Q[n]s on the polymers were still freely accessible. This synthetic approach may be extended to a variety of Q[n]s that are difficult to functionalise.
研究领域:
高分子化学
·
超分子化学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Xiaolong Tian,Guoyang Chen,Han Wang,Jian Cui,Ailin Gao,Yehai Yan
Janus membranes exhibit notable benefits in enhancing the anti-fouling ability during membrane distillation (MD). However, the bonding stability between the hydrophilic layer and the hydrophobic matrix is a worrying concern. In this work, we developed an interfacial free radical polymerization (IFRP) method by segregating photoinitiator and polyethylene glycol diacrylate (PEGDA) monomers into the oil and water phases, respectively. This approach facilitated a crosslinking reaction initiated at the oil–water interface, leading to the formation of a discontinuous or continuous hydrogel-like coating on one side of the PVDF membrane within a 30-second light-induced reaction. The PEGDA gel filled the membrane pores rather than growing outward along its surface, thus creating a “physical interlocking” effect and significantly enhancing their bonding stability. Anti-fouling and anti-wetting experiments were conducted under harsh conditions, including hypersaline solution of 20 wt%, high oil-content saline emulsion and humic acid/CaCl 2 mixed brine. Results demonstrated stable water vapor flux and salt rejection. By increasing the molecular weight of PEGDA monomers, a dense gel layer can be conveniently obtained, which can withstand high-concentration surfactant. This proposed IFRP method offers strong customizability, enabling the efficient production of either porous or dense hydrophilic layers to adapt to various salt solutions.
研究领域:
材料科学
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环境工程
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化学工程
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产品关联
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2024
·Vol. 225
·期 19
·2400159
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IF 2.5
Yuxiao Li,Wentao Liu,Kan Liu,Qingyue Wang,Xiaohui Li,Erlita Mastan,Yuanfeng Wu,Pingwei Liu,Bo Peng,Khak Ho Lim,Wen-Jun Wang
Mechanistic understanding of free radical polymerization (FRP) in aqueous solution is hindered by the lack of kinetic coefficient data. Here, we investigated the propagation rate coefficient ( k p ) for FRP of HEMA in aqueous solution. The k p at 80 °C increased by 6 times as the monomer weight fraction in aqueous system decreases from 100 wt.% to 6 wt.%, that is., from 6.0 × 10 3 to 3.3 × 10 4 L·moL −1 ·s −1 . This increase in k p is associated with the increase in pre-exponential factor ( A ), which suggests an increase in entropy with increasing water molecules in the polymerization system. To investigate the effect of solvent on k p , pulse-laser polymerization in solvents of different hydrogen bonding affinity, that is, 50 wt.% butyl propionate (BP) and dimethyl formamide (DMF), are conducted. The k p obtained are in order of k p , bulk ∼ k p , BP > k p , DMF , suggesting that the intermolecular hydrogen bonding at carbonyl moieties critically affects the geometry of transition state quasi-equilibrium in propagation. We underpinned this observation by analyzing the carbonyl and alkene moieties of HEMA in different solvents using infrared (IR) spectroscopy. The mechanistic analyses and insights relating to hydrogen bonding and functional moieties can be relevant for future studies involving non-aqueous solvents promoting hydrogen bonds.
研究领域:
化学
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高分子科学
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
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IF 6.14
Chuanwei Lu,Yupeng Liu,Xiaohuan Liu,Chunpeng Wang,Jifu Wang,Fuxiang Chu
Sustainable shape-memory and self-healing elastomers with semi-interpenetrating network were prepared by a simple, efficient, and green bulk radical polymerization of ethyl cellulose, furfural, and fatty-acid-derived monomers. This approach could in situ one-pot form a semi-interpenetrating network elastomer with properties combining multiple-shape-memory and self-healing under solvent-free conditions. These elastomers were found to possess excellent multiple-shape-memory properties toward temperature, water, THF, and methanol. Moreover, the multiple-shape-memory properties could assist the self-healing of these elastomers, which was triggered by heating. Self-healing behavior studies showed that the presence of linear polymers in these elastomers could significantly improve the self-healing performance. This work provides a facile, efficient, and green approach in a solvent-free system to design new-generation sustainable, green, and functional materials.
研究领域:
材料科学
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绿色化学
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产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2019
·
IF 3.42
Chuanbao Xie,Zhiming Wang,Yaoyao Liu,Liang Song,Lei Liu,Zhongwei Wang,Qing Yu
In order to use the visible light for light curing, a new compound named 4-diethylaminobenzoyldipenylphosphine oxide (DEAPO) was designed and synthesized. Firstly, DEAPO shows good performance as the cleavage photoinitiator in the photopolymerization of trimethylolpropane triacrylate (TMPTA). The double bond conversion obtained with DEAPO system was even higher than the widely used acyl phosphine photoinitiator (2,4,6-trimethylbenzoyl) diphenylphosphine oxide (TPO). With the same initial quality, the migration of DEAPO was much lower than TPO. Secondly, DEAPO was successfully used as coinitiator in the H-abstraction type photoinitiation system because of the diethyl amino group. Results mean that the novel acylphosphine oxide DEAPO was an efficient difunctional photoinitiator.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 2
·219
·
IF 2.935
Xin Chen,Chi Zhang,Weidong Li,Lei Chen,Wusheng Wang
A key for the preparation of polyacrylate-based polyurethane is the synthesis of hydroxyl-terminated polyacrylate. To our knowledge, exactly one hydroxyl group of every polyacrylate chain has not been reported. The hydroxyl-terminated poly(butyl acrylate) (PBA) has been successfully synthesized by degenerative iodine transfer polymerization (DITP) of then-butyl acrylate (n-BA) using 4,4′-azobis(4-cyano-1-pentanol) (ACPO) and diiodoxylene (DIX) as initiator and chain transfer agent, respectively, and subsequently substituted reaction of the iodine-terminated PBA with β-mercaptoethanol in alkaline condition. The latter reaction was highly efficient, and the terminal iodine at the end of polymer chains were almost quantitatively transformed to a hydroxyl group. 2,2′-Azobis(isobutyronitrile) (AIBN) and ACPO were used as initiators in the DITPs ofn-BA. The results demonstrated that they had a significant influence on the terminal groups of the formed polymer chains. The structure, molecular weight, and molecular weight distribution of the hydroxyl-terminated PBA have been studied by1H,13C NMR, and GPC results. The components of hydroxyl-terminated PBA were determined by MALDI-TOF MS spectra, and their formation is discussed. The broad molecular weight distribution of the PBA and the difference in the polymerization behaviors from typical living radical polymerization are explained based on the results of1H NMR and MALDI-TOF MS spectra. The hydroxyl-terminated PBA has been successfully used in the preparation of PBA-based polyurethane dispersions (PUDs). The aqueous PUDs were stable, and based on the DSC results it can be said that the miscibility of hard segments with PBA chains was improved.Keywords:poly(n-butyl acrylate);degenerative iodine transfer;free-radical polymerization;waterborne polyurethane
研究领域:
材料科学
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高分子化学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Jiaye Xie,Lu Han,Zhen Luo,Qi Li,Jinliang He
Dielectric polymers are playing important roles in electrical and electronic industries. However, aging under high electric stress is a main threat to the reliability of polymers. In this work, we demonstrate a self-healing method for electrical tree damage based on radical chain polymerization, which is initiated by in situ radicals that are generated during electrical aging. Acrylate monomers contained in microcapsules will be released and flow into hollow channels after the capsules are punctured by electrical trees. Autonomous radical polymerization of the monomers will heal the damaged regions, which is triggered by radicals resulting from polymer chain scissions. After optimizing the healing agent compositions by evaluating their polymerization rate and dielectric properties, the fabricated self-healing epoxy resins showed effective recovery from treeing in multiple aging–healing cycles. We also expect the great potential of this method to heal tree defects autonomously without the need to switch off operating voltages. This novel self-healing strategy will shed light on building smart dielectric polymers with its broad applicability and online healing competence.
研究领域:
材料科学
·
电气工程
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产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 10
·3773-3780
·
IF 3.269
Huimin Wu,Carla Silva,Yuanyuan Yu,Aixue Dong,Qiang Wang,Xuerong Fan,Ping Wang,Jiugang Yuan,Artur Cavaco-Paulo
We report an eco-friendly approach to improve the hydrophobicity of jute fabrics via horseradish peroxidase (HRP)-catalyzed covalent grafting of butyl acrylate (BA) and 2,2,3,4,4,4-hexafluorobutyl methacrylate (HFBMA). Hydrophobic vinyl monomers were grafted onto the exposed lignin molecules of the jute surface by free-radical polymerization in the presence of a HRP/H2O2/acetylacetone (ACAC) system. Coupling onto the lignin–jute surface was demonstrated by attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR), solid-state nuclear magnetic resonance (solid-state 19F NMR), elemental analyses, X-ray photoelectron spectroscopy (XPS), energy-dispersive X-ray spectroscopy (EDS), matrix-assisted laser desorption/ionization mass spectrometry (MALDI-TOF MS) and scanning electron microscopy (SEM). The hydrophobicity and oleophobicity of modified jute fabrics was estimated in terms of contact angle and wetting time. The results indicated that it was essential to attain vinyl monomers grafting polymerization onto jute surfaces in a HRP/H2O2/ACAC system. Moreover, the grafting of vinyl monomers led to hydrophobicity increases of 53.86% and 61.03% in the contact angle of grafted jute fabrics with BA and HFBMA when compared with unmodified jute fabrics, respectively. Both vinyl monomers demonstrated high propensity to be polymerized by HRP in the presence of H2O2, and acquired the ability to act as high-performance composites with hydrophobic resins.
研究领域:
材料科学
·
生物化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）