JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2014
·Vol. 14
·期 7
·4837-4842
·
IF 1.339
Liu Hanxia,Song Zhijian,Chen Xuemei
A photocleavable nitrobenzyl ester group was introduced in the backbone of self-assembling peptides using standard Fmoc-peptide systhesis. The nitrobenzyl ester group could be used as a cleavable linker to connect a gelator and a hydrophilic group. Photo-irradiation would lead to the
generation of the molecular gelator and the formation of a molecular hydrogel. The nitrobenzyl ester group could also be used as one part of hydrophobic capping group for short peptides to produce molecular hydrogelators. In this case, photo-irradiation would lead to the release of hydrophobic
anti-imflammatory drug of Naproxen and the gel-sol phase transition. The application of photocleavable group in molecular self-assembly would lead to photo-controllable self-assembly materials for controlled drug release, tissue engineering, and regenerative medicine.
研究领域:
生物材料学
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药物递送
·
组织工程学
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DOI
PubMed
高影响因子
Journal of Coatings Technology and Research
·
2025
·
IF 2.8
Song Xiao,Zhou Chuanjiang,Yang Sijia,Liu Shengjie,Wu Zhaoqiang,Chen Hong
Polycarbonate (PC) substrates are widely used in our daily lives, but their inherent hydrophobicity makes them susceptible to changes in ambient temperature and humidity, which can cause fog that affects their light transmittance, limiting their use in applications that require high light transmittance, such as eyeglass lenses, automotive parts, and medical devices. In this study, P(HEAA- co -AEMA- co -BPA) transparent anti-fog coatings were prepared via one-step free radical copolymerization using N -(2-hydroxyethyl)acrylamide (HEAA), 2-aminoethylmethacrylate hydrochloride (AEMA), and 4-acryloyloyloxybenzophenone (BPA) as monomers. The hydrophilic HEAA monomer provides the coating with anti-fogging performance. The amino functional group in the AEMA segment reacts with the ester group on the surface of the PC substrate to form covalent urethane bonds during heat curing, and the hydrophobic BPA not only covalently binds with the PC substrate under UV irradiation but also prevents the anti-fogging performance of the anti-fog coating from being lost because of the absorption of too much water. The resulting transparent coatings have excellent anti-fogging effects in hot vapor tests and freeze–warm tests. Furthermore, the coatings exhibited good adhesion in the cross-cut tests. Quartz sand abrasion tests and wet cloth wiping tests also revealed that the coating has good abrasion resistance in both dry and wet states.
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
CHINESE JOURNAL OF POLYMER SCIENCE
·
2019
·Vol. 37
·期 11
·1152-1161
·
IF 2.804
Shi Lei,Zhang Ruo-Yu,Ying Wu-Bin,Hu Han,Wang Yu-Bin,Guo Ya-Qian,Wang Wen-Qin,Tang Zhao-Bin,Zhu Jin
Thermoplastic poly(ether-ester-urethane)s were synthesized from poly(L-lactide) diols (PLLA diols), polytetrahydrofuran diol (PTMG diols), 4,4′-dicyclohexylmethane diisocyanate (HMDI), and 1,4-butanediol (BDO) by a two-step reaction, and the morphology and property of the resultant TPU could be adjusted by varying the PLLA contents. The soft segment was composed of PLLA and PTMG diols. By controlling the percentage of PLLA in the soft segment, the glass transition temperature and mechanical properties of the polyurethanes could be regulated. Based on the FTIR spectrum, we found that two kinds of hydrogen bonding existed individually in soft matrix and hard domain. The hydrogen bonding in soft matrix was unstable, which could be destroyed during elongation. With in situ stretching WAXS and SAXS experiments, we found that the PLLA crystal was destroyed and the PLLA domain oriented along the stretch direction. Finally, we proposed a schematic model to illustrate the microstructures of these elastomers before and after stretch.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 8
·3138
·
IF 3.4
Bing Zhang,Ruohan Xia,Yao Yan,Jia Liu,Zisheng Guan
To improve the efficacy of polymer-based substrate hybrid coatings, it is essential to simultaneously optimize mechanical strength and preserve the optical properties. In this study, a mixture of zirconium oxide (ZrO2) sol and methyltriethoxysilane modified silica (SiO2) sol-gel was dip-coated onto polycarbonate (PC) substrates to form zirconia-enhanced SiO2hybrid coatings. Additionally, a solution containing 1H, 1H, 2H, and 2H-perfluorooctyl trichlorosilane (PFTS) was employed for surface modification. The results show that the ZrO2-SiO2hybrid coating enhanced the mechanical strength and transmittance. The average transmittance of the coated PC reached up to 93.9% (400–800 nm), while the peak transmittance reached up to 95.1% at 700 nm. SEM images and AFM morphologies demonstrate that the ZrO2and SiO2nanoparticles were evenly distributed, and a flat coating was observed on the PC substrate. The PFTS-modified ZrO2-SiO2hybrid coating also exhibited good hydrophobicity (WCA, 113°). As an antireflective coating on PC, with self-cleaning capability, the proposed coating has application prospects in optical lenses and automotive windows.Keywords:ZrO2-SiO2hybrid coating;hydrophobicity;antireflective;polycarbonate substrates
研究领域:
材料科学
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表面工程
·
光学材料
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产品关联
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2022
·
IF 5.122
Feng Li,Mingyue Pan,Qi He,Qianhua Zhou,Qian Tang,Chengbin Gong
Multifunctional electrochromic materials are widely used in optoelectronic devices . Pyrene is a π-electron-rich group with fluorescence properties. Ester-functionalized pyrene derivatives potentially have interesting multifunctional properties such as electrochromic and electrofluorochromic characteristics. In this work, mono-, di-, tri-, and tetra-ester-substituted pyrene derivatives were synthesized, and the effects of the number of ester substituents on their photophysical, electrochemical, electrochromic, and electrofluorochromic properties were investigated. The number of ester substituents significantly affected these properties. An increase in the number of ester substituents on the pyrene caused red shifts in the absorption and emission spectra, a decrease in the driving voltage , and changes in the electrochromic colored states and electrofluorochromic performance. Mono-, di-, and tri-ester-functionalized pyrene derivatives showed good electrochromic properties, namely good switching stabilities, high optical contrasts, rapid responses, and high coloration efficiencies. Mono- and tri-ester-functionalized pyrenes gave good electrofluorochromic performances with reversible fluorescence quenching–fluorescence restoring between colored and bleached states during the electrochromic process. Ester-functionalized pyrene derivatives were successfully used in two functional digital displays with vivid colors. These results show that ester-functionalized pyrene derivatives with good electrochromic and electrofluorochromic properties are promising candidates for use in various applications, e.g., digital displays, organic electroluminescence displays, electronic shelf labels, energy-saving windows, and electronic paper.
研究领域:
材料科学
·
化学
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DOI
高影响因子
Lubricants
·
2024
·Vol. 12
·期 12
·455
·
IF 3.1
Linghao Zhang,Qiuyu Shi,Xiangyu Ge
Electro-regulated friction is a widely adopted approach for reducing friction, with graphene oxide (GO) emerging as a promising lubricating additive due to its electro-responsive frictional behaviour. However, with the wide variety of functionalized GO additives available, each exhibiting distinct properties, it remains unclear which type demonstrates the most effective electro-regulated friction-reducing performance, limiting their broader industrial application. In this study, the frictional behaviour of three functionalized GO additives under electric stimulation was investigated along with an analysis of the corresponding worn surfaces. The findings reveal the role of functional groups in determining the tribological performance of functionalized GO additives and the mechanism of electric stimulation. Notably, the formation of ester groups during the friction process of GO-OH enhances the adsorption of GO additives onto steel surfaces, resulting in superior friction-reducing properties. Under lubrication with GO-OH additives, negative electric stimulation promotes the generation of ester groups and transitions the lubrication regime to mixed lubrication, thereby contributing to friction reduction. This work provides new insights into the tribological performance of functionalized GO additives and the mechanisms underlying their electro-regulated behaviours, laying a foundation for the design of GO additives with superior lubrication performance for practical engineering applications.
研究领域:
材料科学
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机械工程
·
表面工程
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2025
·
IF 4
Zhang Xiao-Hui,Zhao Ya-Jun,Wang Can,Tang Shan
Incorporating a low density of ester units into the backbone of polyethylene materials enhances their sustainability and recyclability while maintaining the main material properties of polyethylenes. Here we report a new way to access degradable polyethylene materials with a low content of in-chain ester units via mechanochemical backbone editing. Initially, ester groups are incorporated as side groups through catalytic copolymerization of ethylene with a cyclobutene-fused lactone monomer (CBL), yielding polyethylene materials with high molecular weights and adjustable thermomechanical properties. Subsequent solid-state ball-milling treatment selectively introduces side-chain ester groups into the main chain of the polyethylene materials via force-induced cycloreversion of the cyclobutane units. Under acidic conditions, hydrolysis of the resultant polyethylene materials with in-chain ester units facilitates further degradation into oligomers.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Yehan Yang,Mengxia Xu,Zhu Luo,Ruhui He,Jikai Xie,Shenglong Yang,Hu Chen,Huaibin Li
To address the compatibility challenges between polypropylene (PP) and poly(ethylene terephthalate) (PET), a long-chain-branched polypropylene compatibilizer featuring ester groups (LCB-PP-E) was synthesized from PP and pentaerythritol triacrylate (PETA), facilitated by the initiator dicumyl peroxide. The structure of LCB-PP-E was characterized by using infrared spectroscopy, rheology, and melt flow index analysis, while potential reaction mechanisms were discussed. The morphology of the blend was examined by scanning electron microscopy and Raman spectroscopy. The effects of LCB-PP-E on the thermodynamic and crystallization behavior of PP/PET blends were studied by dynamic mechanical analysis, differential scanning calorimetry, and polarizing microscopy. LCB-PP-E sampled at the reaction peak point exhibited a longer branched PP chain compared to that of LCB-PP-E obtained at the balance torque, facilitating better entanglement with PP macromolecules. Furthermore, the ester groups on LCB-PP-E engaged in transesterification reactions with the ester groups on the PET chains. The combined effects of these interactions effectively reduced the interfacial tension between the two phases, resulting in a decreased size of the dispersed PET phase and a more uniform distribution. Additionally, the introduction of LCB-PP-E significantly narrowed the crystallization and glass transition temperature difference between the phases. The enhanced compatibility led to an increase in elongation at break, demonstrating a transition of the blend from a brittle material to a ductile material. This compatibilization system shows substantial potential for high-quality applications in PP/PET recycled plastics.
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2018
·Vol. 48
·期 10
·1121-1129
·
IF 2.262
Zhu Chun-Rong,Long Jun-Fei,Tang Qian,Gong Cheng-Bin,Fu Xiang-Kai
Abstract This paper aims to develop a multi-colored electrochromic device based on mixed mono- and bi-substituted 4,4′-bipyridine derivatives containing an ester group. A series of these derivatives were synthesized, and their electrochemical and electrochromic properties were studied through cyclic voltammetry and ultraviolet–visible spectroscopy. The mono- and bi-substituted 4,4′-bipyridine derivatives containing an ester group displayed different onset bias and colored state. Mono-substituted 4,4′-bipyridine derivatives showed a magenta colored state at an onset bias of − 1.3 V; bi-substituted 4,4′-bipyridine derivatives showed violet colored states at an onset bias of − 0.8 V. A multi-colored electrochromic device was achieved by mixing mono- and bi-substituted 4,4′-bipyridine derivatives as the electrochromic layer. Graphical Abstract
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
Energy Material Advances
·
2024
·
IF 14.8
Hanyan Wu,Xinyang Chen,Changyong Zhao,Yingkang Tian,Xiaofei Yang,Runcang Sun,Xuejie Gao
Building lithium fluoride (LiF)-rich solid electrolyte interphases (SEIs) by the decomposition of fluorinated salts has been widely adopted to be effective to suppress lithium dendrite growth, thus prolonging the lifespan of fast-charging lithium metal batteries (LMBs). Nevertheless, the slow dissociation of LiF salts reduces both their utilization and the formation of inorganic SEI. Herein, cellulose acetate (CA) was incorporated into the electrolyte to create an inorganic-rich SEI through ester groups, where the lithiophilic oxygen atoms in the ester group (C═O) enhanced lithium-ion diffusion and anion dissociation rates. Therefore, rapid ion diffusion and dendrite-free anodes were achieved in the ester-based electrolyte with CA (named as CA-E). As a result, the lithium symmetric batteries with the CA-E electrolyte exhibited stable cycling performance for 5,000 h at a current density/capacity of 3 mA cm−2/1 mAh cm−2, while a short-circuiting was observed after ~450 h for the bare electrolyte. Benefiting from the rational design, lithium iron phosphate batteries with the CA-E electrolyte showed an excellent C-rate performance with a capacity of 100.7 mAh g−1 at the rate of 10 C. Moreover, a specific capacity of 110.3 mAh g−1 was maintained after 300 cycles at the rate of 6 C with a Coulombic efficiency of 99.87%. This work proposes a new approach to dendrite inhibitors for fast-charging LMBs.
研究领域:
材料科学
·
电化学
·
能源存储
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产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2018
·
IF 4.946
Nataliya A. Gavrilenko,Dmitrii A. Fedan,Nadezhda V. Saranchina,Mikhail A. Gavrilenko
A novel colorimetric sensor has been proposed for sensitive and accurate detection of iodine forms using polymethacrylate matrix, which also has the outlook for use with samples without pre-treatment and is suitable to fit in a portable instrument for in situ iodine analysis. This determination method is based on interaction of polymethacrylate matrix with iodine forms followed by measurement of absorbance at 370 nm. The principle of this colorimetric sensor is not ordinary colorimetry , but a new colorimetric strategy that combines solid phase extraction and spectrophotometric determination of a target substance following completion of the color change processes. This method ensures determination of 0.05–80.0 µg·g −1 of iodine with the detection limit of 0.02 µg·g −1 . The testing results show that this polymethacrylate matrix can be used for determination of iodine in solutions, food grade salt and iodinated mineral water.
研究领域:
分析化学
·
食品安全
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 133
·期 5
·
IF 1.768
Muhammad Remanul Islam,Mohammad Dalour Hossen Beg,Saidatul Shima Jamari
In this study, the contribution of multiwalled carbon nanotubes (MWCNTs) was studied for the evaluation of the performances of polyalkyd-based films produced from dehydrated palm oil. Initially, different percentages of MWCNTs, including 0.5, 1.0, and 1.5 wt %, were considered for loading into the resin with the help of sonication. Additionally, a 1.0 wt % loading was considered for in situ conditions during the esterification process to achieve better dispersion and obtain improved properties of the film. The loading was evaluated by different performance tests, such as those of tensile, elongation, pencil hardness, swelling ratio, gel content, wettability, chemical resistivity, adhesion, and surface morphology. The results of mechanical testing showed that the addition of 1.0 wt % MWCNTs enhanced the tensile strength by 50%, whereas in situ conditions were found to be favorable for significantly improving the tensile strength by 75%. Moreover, the wettability, surface morphology, and thermal properties were also found to be in favor of in situ conditions for the dispersion of the MWCNTs. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 42934.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
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