CHINESE JOURNAL OF POLYMER SCIENCE
·
2021
·Vol. 39
·期 9
·1161-1168
·
IF 3.603
Gao Dan-Ni,Zhao Yu-Lai,Cai Jing-Yu,Hou Lin-Xi,Xiao Long-Qiang
Reversible chain transfer catalyzed polymerization (RTCP) is a practical and efficient process for the precise synthesis of polymers with special architecture by using simple phenols (2,4,6-trimethylphenol, TMP) or hydrocarbons (xanthene, XT) as efficient organocatalysts. Herein, alkyl iodide (R-I), which was generated from in situ bromine-iodine transformation of alkyl bromide (R-Br) with sodium iodide (NaI), was served as initiator to mediate RTCP with TMP or XT. MMA and other functional methacrylates, including GMA, DEAM, DMAEMA and BzMA, were successfully initiated by combining organocatalysts and azo initiators to yield polymers with low-polydispersity ( M w / M n =1.1–1.5) and ideal monomer conversions (50%–90%) at moderate temperature. Moreover, 3-armstar polymers were also obtained by this method. The high chain-end fidelity of the obtained poly(methyl methacrylate) with iodine as chain-end group (PMMA-I) was confirmed by chain-extension reaction. The environmentally friendly initiators and organocatalysts exhibit powerful polymerization properties toward RTCP, providing a significant method to synthesize functional polymers.
研究领域:
高分子化学
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材料科学
·
有机化学
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产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 65
·59946-59955
·
IF 3.289
Liangliang Dong,Yue Wang,Mingqing Chen,Dongjian Shi,Xiaojie Li,Chunfang Zhang,Hui Wang
We report a high performance and CO2-philic, comb copolymer consisting of poly(ethylene glycol) methyl ether methacrylate (PEGMA), polymethyl methacrylate (PMMA) and poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA) for use in composite membranes for CO2/N2 separation. Since the copolymers contain ethylene oxide (EO) groups and amino groups, the separation performance was expected to be enhanced by the synergistic effect of (1) the increased solubility of CO2 by dipole–dipole interactions between CO2 and EO units and (2) the enhanced CO2 transport by reversible reactions between CO2 and amino groups. The best separation performance was obtained from the PEDM5 composite membrane with 25 mol% of PEGMA, at which the CO2 permeability was 308 barrer and CO2/N2 selectivity was 38, which displays a potentially promising alternative for CO2 separation from N2.
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 35
·e52859
·
IF 3.057
Lu Han,Lingxiao Li,Rongsheng Gao,Xueyan Liu,Chengyou Kan
The relationships between morphology and properties are important for functional polymer particles. In this work, stable core/shell PMMA/P(MMA- co -PDSECAE) (C/S) latexes with uniform particle size are first prepared through semi-continuous soap-free seeded emulsion polymerization of methyl methacrylate (MMA) and 2-(((2-[pyridin-2-yldisulfanyl]ethoxy)carbonyl)amino) ethyl acrylate (PDSECAE), and thiol-functionalized core/shell PMMA/P(MMA- co -PDSECAE)-SH (C/S-SH) submicron particles (SPs) are then obtained by reduction of disulfide bonds with dithiothreitol (DTT). Adsorption behaviors of heavy metal ions on the SPs are investigated. Results show that, the C/S-SH SPs, with more thiol groups distributed closer to the surface, have nearly twice the Pb 2+ adsorption capacity of the homogeneous SPs prepared via batch emulsion polymerization. The C/S-SH SPs show strong selective adsorption capacities toward Hg 2+ and Pb 2+ , and maximum adsorption capacities reach 0.477 and 0.303 mmol g −1 , respectively. Due to their high selectivity, adsorption capacity, specific surface area and simple preparation process, these core/shell SPs have promising applications in water treatment.
研究领域:
材料科学
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环境科学
·
高分子化学
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DOI
高影响因子
CHEMICAL PAPERS
·
2018
·Vol. 72
·期 11
·2871-2877
·
IF 0.963
Wang Yazhen,Li Rifang,Jia Hongge,Yang Guoxing,Di Yutao,Xu Chenxi,Ma Liqun,Zhang Hui,Zhou Yongli,Zang Yu,Xu Shuangping,Sun Zhaoyang,Zu Liwu,Yue Chenge,Lan Tianyu
A novel peroxy group-containing silane coupling agent was synthesized and anchored on the surface of titanium dioxide nanoparticles (nano-TiO 2 ) to form an immobilized-initiator-modified nano-TiO 2 species. In this study, the kinetic parameters of the peroxy group-containing silane were tested and assessed using DSC. The pre-exponential factor ( A d ) was 8.973 × 10 8 and the activation energy ( E a ) was 80.736 kJ mol −1 . Moreover, the empirical Arrhenius equation was determined to be ln K d = − 80.736/ RT + ln(8.973 × 10 8 ). To obtain continuous polymers, acrylonitrile (AN) and methyl methacrylate (MMA) were polymerized using the novel peroxy group-containing silane and FeSO 4 as an initiator system. The number average molecular weights ( M n of PAN = 3×10 4 and M n of PMMA = 1.4 × 10 5 ) and polydispersity indexes (PDI of PAN = 2.76 and PDI of PMMA = 1.65) were determined by GPC. It was suggested that the redox initiation system can generate highly reactive species on the surfaces of inorganic nanoparticles. The nano-TiO 2 -grafted polymers were successfully obtained.
研究领域:
高分子化学
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材料科学
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纳米技术
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表面改性
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引发剂设计
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DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Wangbing Yao,Zhuoyuan Zheng,Xudong Zhang,Jie Zhou,Jinbao Song,Dongming Liu,Yusong Zhu
In the quest for high-energy-density lithium metal batteries (LMBs), the stabilization of lithium (Li) metal anodes during fast charging remains a formidable challenge. In this study, a novel copolymer , Poly(methyl methacrylate- co -styrene) (namely PMS) is synthesized and blended with Poly(vinylidene fluoride) to fabricate a porous gel polymer electrolyte (GPE, namely PMS-PVDF) through the nonsolvent-induced phase separation technique, which significantly enhances the electrochemical stability and fast-charging capabilities of LMBs. The developed GPE exhibits a high ionic conductivity of 5.62 mS cm −1 , thereby reducing the formation of detrimental Li dendrites and leading to over 400 h stripping/plating process at 0.5 mA cm −2 . Extensive electrochemical tests show that the LMBs with the obtained PMS-PVDF GPE achieve exceptional cycle stability over 600 and 1000 cycles at the C-rates of 0.5 and 3 C, respectively, outperforming traditional electrolytes. Furthermore, the ultra-stability of the quasi-solid-state electrolyte is demonstrated in a 375 mAh pouch cell setup, suggesting an essential trait for the practical application of high-power devices. This work marks a pivotal contribution to the field of energy storage, delivering insights and a clear methodology that pave the way for the development of next-generation LMBs poised for commercial viability.
研究领域:
材料科学
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电化学
·
能源存储
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产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2020
·Vol. 27
·期 3
·1-11
·
IF 2.426
Du Chunhui,Zhang Xinyi,Ma Xumin
In order to obtain the tunable and charged surface of the membranes, polymerized ionic liquid(PIL) block copolymers poly (methyl methacrylate) (PMMA)-b-poly(1-[(2-methacryloyloxy)ethyl]-3-butylimidazoliumbromide) (PMEBIm-Br) with different poly(ionic liquid) brush lengths were synthesized by RAFT polymerization method and used in the fabrication of poly(vinylidene fluoride) blend membranes. Chemistry analysis confirmed the successful copolymerization of P(MMA-b-MEBIm-Br) with different chain lengths of PMEBIm-Br blocks, and the PIL groups was also detected on the surface of the blend membranes, which contributes to the hydrophilic and positively charged surface of the membrane. These properties were further enhanced by the chain length of PMEBIm-Br blocks in the copolymer. The surface wettability of the membranes can be regulated from hydrophilicity to hydrophobicity by anion exchange, and the water flux changes also confirmed these phenomena. In addition, the effects of PMEBIm-Br blocks on the separation properties of the membranes were investigated using two dyes, namely, orange G and rhodamine 6G. Results indicated that the blend membranes with long length of PMEBIm-Br blocks had high rejection and good antifouling property to rhodamine 6G. Furthermore, the adsorption experiment of the blend membranes to the two dyes also indicated that blend membranes with long length of PMEBIm-Br blocks would have good dye adsorption-separation property.
研究领域:
材料科学
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化学工程
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环境科学
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DOI
高影响因子
FOOD CHEMISTRY
·
2019
·
IF 5.399
Fan Du,Zhaoguang Yang,Peng Liu,Lin Wang
The bioaccessibility and speciation of arsenic (As) in rice grains have been investigated by the physiologically based extraction test (PBET) method. A total of 42 rice samples were collected from Hunan Province, a typical mine-impacted province in China. The bioaccessibility in the gastrointestinal tract was 71.7 ± 13.5% for the collected rice grains. Arsenite [As(III)] was the predominant As species in the simulated gastric and gastrointestinal solutions, followed by dimethylarsinic acid (DMA), arsenate [As(V)] and monomethylarsonic acid (MMA). The bioaccessible As(V) was irrelevant to As(V) in the rice grains, suggesting that interconversion between As(V) and other species was occurred in the simulated gastrointestinal tract. Monte-Carlo simulation was introduced to assess the health risk from exposure to inorganic As. The average values for target hazard quotient (THQ) and bioaccessible THQ were 2.704 and 1.637, respectively. The inclusion of bioaccessibility reduced the probability of non-carcinogenic health risk from 97.32% to 76.86%.
研究领域:
环境科学
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毒理学
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食品安全
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公共卫生
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2026
·
IF 8.4
Xinyou Zhang,Yutong Yang,Jianxin Wang,Jianjiao Xin,Wendi Wang,Yao Chen,Guangming Yin,Hong Pan
Among various cathode materials, sulfurized polyacrylonitrile (SPAN) is considered a highly promising cathode for Lithium-sulfur (Li-S) batteries due to its unique covalent sulfur fixation mechanism, which fundamentally suppresses polysulfide dissolution and the shuttle effect. However, conventional SPAN materials typically limit sulfur chains to short S 2 -S 4 structures to maintain a solid-solid reaction, restricting their theoretical capacity. Moreover, the material's insulating nature and significant volume changes during cycling greatly limit its electrochemical performance and practicality. To address these issues, this study designed and synthesized a high-elasticity water-based binder based on a 2-ethylhexyl acrylate/acrylic acid/methyl methacrylate (2-EHA-AA-MMA) terpolymer. Abundant carboxyl groups (-COOH) in its molecular chain form stable S-O covalent bonds with sulfur chains in SPAN. Combined with PAN's terminal fixation of sulfur chains, this achieves a synergistic “long-chain capacity enhancement and strong anchoring shuttle suppression” effect. It stabilizes long S 6 chains, improving cycling stability and reversible capacity, while also directing S 6 conversion directly to Li 2 S 3 , bypassing soluble Li 2 S 4 intermediates to suppress shuttle effects at the source. Experimental results show that the SPAN cathode with this binder delivers a high specific capacity of 850.3 mAh g −1 at 0.1 C, with 68.4% capacity retention after 100 cycles and effective polysulfide shuttle suppression.
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DOI
高影响因子
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
·
2022
·
IF 3.369
Shuai Li,Yuanshu Xiao,Guohua Shan,Xinlei Fan,Mengru Wang,Rui Liu,Lixia Jia
Biomimetic structural colors have demonstrated significant practical promise in eco-friendly coloring. However, the development of novel, simple, and effective methods for the fabrication of photonic crystal structural colors remains an enormous challenge, particularly for flexible substrates . In this work, we prepared structural color coatings with bright, full-color, and low angle dependence on flexible textile substrates via simple vacuum-assisted filtration self-assembly (VAFS). The resultant photonic crystals were polycrystalline structures containing both face-centered cubic (FCC), simple cubic (SC), and amorphous structures (APS), resulting in structural color coatings with bright and low angle dependence. The precise regulation of different hues of structural colors can be achieved by changing the size of microspheres or mixing of microspheres with different sizes. Furthermore, various microspheres (e. g., SiO 2 , SiO 2 @PDA or P (St-MMA-AA)) and fabrics (cotton, linen, silk or wool fabric) can be utilized as self-assembly materials to create structural color coatings, demonstrating the simplicity, low-cost, and great compatibility. Meanwhile, this method may also be applied to the preparation of structural color coatings on substrates with pores, expanding the application of structural colors in various fields.
研究领域:
材料科学
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纺织工程
·
光学
·
纳米技术
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DOI
高影响因子
Communications Chemistry
·
2025
·Vol. 8
·期 1
·1-11
·
IF 6.2
Wang Min,Luo Xiongfei,Wang Qunying,Strehmel Veronika,Chen Zhijun,Li Shujun,Strehmel Bernd
Valorization of waste for chemical processes addresses a challenging task for the society. Soda lignin ( AL ) available in the pulp industry operated in a photocatalytic cycle CuX 2 / L (X: Br, Cl; L : Me 6 TREN: Tris[2-(dimethylamino)ethyl]amine) and to initiate radical photopolymerization of methyl methacrylate (MMA) with α-bromophenylacetate (EBPA) by exposure at 420 nm. This resulted in poly(methyl methacrylate) (PMMA ) exhibiting a dispersity <1.3 with CuX 2 /L loading of ≲ 52 ppm. Deactivator reduction increased dispersity. MMA, styrene, and benzyl methacrylate successfully served as monomers for chain extension and block copolymerization experiments. This worked with CuX 2 /L ≥ 6.5 ppm, although conventional radical polymerization additionally competed. Adding of sodium pyruvate enabled radical photopolymerization under air. Modification of lignin with an aryl sulfonate group resulted in a one-component photoinitiator. It successfully initiated radical photopolymerization of a monomer mixture of (hydroxyethyl)methacrylate (HEMA) and urethane dimethacrylate (UDMA). Scale-up experiments approved practicability of photo-ATRP.
研究领域:
高分子化学
·
绿色化学
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光催化
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材料科学
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可持续化学
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工业化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Regenerative Biomaterials
·
2024
·
IF 5.6
Wang Zhiwei,Sun Lingshun,Wang Weixing,Wang Zheng,Shi Ge,Dai Honglian,Yu Aixi
Diabetic wounds are a difficult medical challenge. Excessive secretion of matrix metalloproteinase-9 (MMP-9) in diabetic wounds further degrades the extracellular matrix (ECM) and growth factors and causes severe vascular damage, which seriously hinders diabetic wound healing. To solve these issues, a double-network porous hydrogel composed of poly (methyl methacrylate-co-acrylamide) (p(MMA-co-AM)) and polyvinyl alcohol (PVA) was constructed by the high internal phase emulsions (HIPE) technique for the delivery of potassium sucrose octasulfate (PSO), a drug that can inhibit matrix metalloproteinases (MMPs), increase angiogenesis, and improve microcirculation. The hydrogel possessed a typical polyHIPE hierarchical microstructure with interconnected porous morphologies, high porosity, high specific surface area, excellent mechanical properties, and suitable swelling properties. Meanwhile, the p(MMA-co-AM)/PVA@PSO hydrogel showed high drug-loading performance and effective PSO release. In addition, both in vitro and in vivo studies showed that the p(MMA-co-AM)/PVA@PSO hydrogel had good biocompatibility and significantly accelerated diabetic wound healing by inhibiting excessive MMP-9 in diabetic wounds, increasing growth factor secretion, improving vascularization, increasing collagen deposition, and promoting re-epithelialization. Therefore, this study provided a reliable therapeutic strategy for diabetic wound healing, some theoretical basis, and new insights for the rational design and preparation of wound hydrogel dressings with high porosity, high drug-loading performance, and excellent mechanical properties.
研究领域:
材料科学
·
生物医学工程
·
药剂学
·
伤口愈合
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产品关联
DOI
PubMed
高影响因子
Materials Horizons
·
2023
·Vol. 10
·期 7
·2455-2463
·
IF 13.3
Meirong Zhang,Bofeng Zhu,Xiao Zhang,Zhenxue Liu,Xiaoyong Wei,Zhicheng Zhang
Polymer-based dielectrics are chiefly used in high-pulse energy storage capacitors for their high breakdown strength, prominent processability, and low cost. Nevertheless, state-of-the-art commercial polymer-based dielectrics such as biaxially oriented polypropylene (BOPP), cannot satisfy the high energy density requirement in many fields because of their low permittivity. Limited success has been achieved in developing polar polymeric dielectrics with high energy density because of the quickly increased energy loss from polarization relaxation and charge conduction under a high electric field and temperature. To achieve high energy density and low loss in polar polymer dielectrics simultaneously, electron-deficient vinyl quinoline (VQQ) units are pre-copolymerized with methyl methacrylate (MMA) followed by blending with a PMMA matrix. The bulky and electron-deficient VQQs have successfully depressed the relaxation of PMMA and significantly decreased charge conduction under an elevated electric field. As a result, a rather high energy discharging efficiency (over 90%) could be finely maintained up to 800 MV m−1, and an energy density of 16.1 J cm−3 could be obtained, which are much better than those of reported polymer dielectrics. The strong space charge trapping effect of the low content of VQQ is well addressed by thermally stimulated depolarization currents (TSDC) and density functional theory analysis (DFT) of increasing breakdown strength, energy density and discharging efficiency. This work offers a promising strategy for achieving high energy density and low loss in polar polymer dielectrics for their commercial application in energy storage capacitors.
研究领域:
材料科学
·
电气工程
·
能量存储
✓ 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）