POLYMER INTERNATIONAL
·
2014
·Vol. 64
·期 4
·563-570
·
IF 2.247
Yi-Ling Huang,Jing Cao,Wei Hu,Sai Liang
Novel optically
active anionic initiators bearing a chiral oxazole substituent on the fluorene ring, ( S )-1-(9H-fluoren-2-yl)-4-isopropyl-4,5-dihydrooxazole lithium (Li-( S )-1-FIDH) and ( S )-2-(9H-fluoren-2-yl)-4-isopropyl-4,5-dihydrooxazole lithium (Li-( S )-2-FIDH), were prepared. Anionic homopolymerizations of achiral N -substituted maleimide (RMI) with the chiral initiators were investigated. The optically active polymers obtained were attributed to asymmetric induction of the chiral initiators. The very crowded chiral initiator Li-( S )-1-FIDH was found to play a better asymmetric induction role in the polymers than Li-( S )-2-FIDH. Anionic copolymerization of ( R )-(+)- N -1-phenylethyl maleimide and optically inactive RMI with Li-( S )-1-FIDH were also studied. © 2014 Society of Chemical Industry
研究领域:
高分子化学
·
有机化学
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DOI
高影响因子
POLYMER INTERNATIONAL
·
2014
·Vol. 63
·期 9
·1699-1706
·
IF 2.247
Pengfei Li,Ting Wang,Fuhou Lei,Pingping Tang,Xuecai Tan,Zuguang Liu,Liqun Shen
A novel method for the separation of berberine hydrochloride has been developed. Berberine hydrochloride molecularly imprinted polymers were prepared by suspension polymerization in the aqueous phase using berberine hydrochloride as the template, methyl acrylic acid as a functional monomer, and ethylene glycol maleic rosinate acrylate (which contains a phenanthrene ring skeleton) and ethylene glycol dimethacrylate as combinatorial crosslinkers. The imprinted polymers were successfully used as a selective stationary phase in high-performance liquid chromatography. Separation performance of the chromatographic column was determined from the selectivity (evaluated by separation factor) and sorption selectivity (evaluated by imprinting factor) of the molecularly imprinted and non-imprinted polymers towards the template. The optimum conditions to maximize separation and imprinting factors were investigated. Acetic acid–methanol solution (0.05% v/v) was selected as the optimum mobile phase, while 0.2 mL min −1 was chosen as the optimized flow rate for selective separation of berberine hydrochloride. The highest imprinting and separation factors obtained were 1.924 and 18.52, respectively. Simultaneously, the chromatographic column backpressure was stable and showed good permeability. The chromatographic column was used to separate effectively template molecules from coptis root extract and other analogues. Such chromatographic columns with high selectivity can be used to selectively separate berberine hydrochloride from other compounds. © 2014 Society of Chemical Industry
研究领域:
分析化学
·
药物化学
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DOI
高影响因子
POLYMER INTERNATIONAL
·
2011
·Vol. 61
·期 1
·111-117
·
IF 2.056
Bing Fang,Kai Pan,Qinghan Meng,Bing Cao
This study investigated the preparation of polyimide solvent-resistant nanofiltration membranes by a two-step method (casting the membrane first and then crosslinking by the thermal imidization method). The influences of polymer concentration, thickness of membranes, temperature of the imidization, phase inversion time and thermal imidization procedure were studied. The membranes with the highest rejection rate of Fast Green FCF (molecular weight 808.86 g mol −1 ) were prepared in the following conditions: polymer concentration 13 wt%, phase inversion time 1 h, membrane thickness 150 µm and thermal imidization procedure 200 °C for 2.5 h, 250 °C for 2 h and 300 °C for 2 h in a vacuum environment; the heating rate was 5 °C min −1 . The membrane was stable in most of the solvents tested and the fluxes of some common solvents were equal to or higher than a number of commercial solvent-resistant nanofiltration membranes. A much higher rejection of dyes in water than in methanol was observed in the filtration experiments and a new way to explain it was developed. Copyright © 2011 Society of Chemical Industry
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
POLYMER INTERNATIONAL
·
2017
·Vol. 66
·期 8
·1199-1205
·
IF 2.07
Zhongwei Wang,Renjie Li,Huimin Chen,Fulong Ma,Xiuxuan Zhang,Yu Cheng,Xiaofei Gu,Zhengjian Qi
Amphiphilic copolymers with cationic hydrophilic moieties and different ratios of hydrophobic portion to hydrophilic portion were designed and synthesized via the combination of hydrosilylation reactions and quaternization reactions. The structures were characterized through Fourier transform infrared spectroscopy, 1 H NMR, 13 C NMR and gel permeation chromatography. The measurements of critical micelle concentrations, electrical conductivities and zeta potentials indicated that the copolymers could self-assemble into nanoparticles with charges around the surface in aqueous solution. The sizes of the micelles were between 67 nm and 104 nm detected by dynamic light scattering. The self-assembled micelles were used as drug carriers to encapsulate a model drug (tocopherol), and their drug-loading content (DLC) and efficiency (DLE) were determined by UV−visible spectra, resulting in considerable drug-loading capacity to a tocopherol maximum up to 17.2% (DLC) and 80.3% (DLE) with a size of 90 nm. The blank micelles and drug-loaded micelles displayed a spherical shape detected by transmission electron microscopy, which demonstrated not only the self-assembly behaviors but also the drug-loading performances of the cationic amphiphilic copolymers. All the results demonstrated that the cationic amphiphilic copolymers could be used as potential electric-responsive drug carriers. © 2017 Society of Chemical Industry
研究领域:
材料科学
·
药学
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DOI
高影响因子
POLYMER INTERNATIONAL
·
2021
·Vol. 70
·期 9
·1246-1254
·
IF 2.99
Ruyi Chen,Jiang Zhong,Huifang Zhu,Chunmi Tang,Yongluo Qiao,Changqing Fu,Jinglan Wang,Liang Shen,Haifeng He,Fei Gao
Treated carbon cloths combined with polypyrrole (PPy) nanowires (TCC@PPyW) were fabricated by template-free electrochemical deposition of pyrrole in the presence of sodium citrate dihydrate and sodium perchlorate. The morphologies and electrochemical performances of the samples were studied using scanning electron microscopy, cyclic voltammetry, galvanostatic charge–discharge measurements and electrochemical impedance spectroscopy. The morphologies of PPy nanostructure were controlled by regulating interfacial pH, deposition time and concentration of sodium perchlorate. PPy nanorods were generated with the aid of water oxidation when the pH of pyrrole solution was 7.9, and PPy nanowires could be obtained by increasing the deposition time or the concentration of sodium perchlorate. The resulting PPy nanowires were about 100 nm in diameter and up to 600 nm in length. TCC@PPyW electrodes provided a large contact area for electrolyte, which facilitated the rapid delivery of electric charge. As a result, the TCC@PPyW electrodes exhibited a high areal specific capacitance of 841.2 mF cm −2 at 0.4 mA cm −2 and a high energy density of 420.6 μWh cm −2 at a power density of 0.2 mW cm −2 . An all-solid-state flexible symmetric supercapacitor without any binder, incorporated with TCC@PPyW as electrodes and poly(vinyl alcohol)–LiCl gel as gel electrolyte, is also reported. The TCC@PPyW supercapacitor displayed excellent flexibility and rate capability. © 2021 Society of Chemical Industry
研究领域:
材料科学
·
电化学
·
纳米技术
·
能源存储
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DOI
高影响因子
POLYMER INTERNATIONAL
·
2022
·Vol. 71
·期 11
·1278-1286
·
IF 3.213
Miao Dai,Siyuan Li,Yan Cui,Wei Zhang,Hui Shi,Kai Pan,Wei Wei,Xiaoya Liu,Xiaojie Li
Although magnesium (Mg) and its alloys are promising biodegradable materials for orthopedic implants, rapid and uncontrollable degradation of Mg is still a challenge for clinical applications. In this work, electroactive polymer coatings were prepared to improve the corrosion resistance and cytocompatibility of Mg alloys. Amphiphilic electroactive tetraaniline (TANi)-conjugated poly( γ -glutamic acid) ( γ -PGA) with various TANi modification rates ( γ -PGA–TANi 10 , γ -PGA–TANi 20 , γ -PGA–TANi 27 ) were first synthesized. γ -PGA–TANi colloidal particles, prepared by a self-assembly method, were then coated on Mg alloys by electrophoretic deposition. The prepared γ -PGA–TANi coatings showed a homogeneous surface and good adhesion on AZ31 Mg alloys. Electrochemical analysis and in vitro immersion tests revealed that γ -PGA–TANi-coated Mg exhibited superior corrosion resistance, which was mainly attributed to the electroactivity of the γ -PGA–TANi coatings, leading to the rapid formation of a passivation layer to prevent the further corrosion of Mg alloys. Furthermore, the γ -PGA–TANi alloy coatings efficiently regulated Mg 2+ release and pH value of coated Mg alloy during immersion for 40 days. In comparison with bare Mg alloy, the coated Mg alloy also showed better cytocompatibility, where L929 cells emerged with a good cell adhesion and viability. These results indicate that electroactive γ -PGA–TANi coatings have promising potential for corrosion resistance of Mg alloys. © 2022 Society of Industrial Chemistry.
研究领域:
材料科学
·
生物医学工程
·
腐蚀科学
·
表面工程
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DOI
高影响因子
POLYMER INTERNATIONAL
·
2026
·
IF 3
Fei Xu,Lei Zheng,Kai Yan,Yan Zong,Qunna Xu,Xiaodan Sun
Intelligent fabrics have been widely investigated owing to their great potential for applications in the field of wearable electronics. Despite significant progress having been made in research on intelligent fabrics, it is still a challenge to combine stable color rendering and sensing capability. In this study, an effective method was developed to prepare a double-sided color composite fabric with hydrophobic water vapor permeability, stable color rendering and excellent sensing properties at different temperatures. The intelligent structural color-changing properties of blue-, green- and orange-colored fabrics are based on monodisperse polystyrene supported silica (PS@SiO 2 ) microspheres of 195, 286 and 301 nm size, respectively. Meanwhile, the structural color does not change as the angle changes. Then, polydimethylsiloxane-modified waterborne polyurethane and ionic liquid were used as adhesives, which not only enhance the interfacial interaction between PS@SiO 2 microspheres and fabric, but also endow the composite fabric with sensing performance and hydrophobicity. When applied to human joint motion detection, the composite fabric-based sensors show good sensitivity (strain coefficient ~ 3.91) and excellent cycling stability (300 times). Simultaneously, the composite fabric has good hydrophobicity (~134°) and excellent water permeability (~410 g m −2 d −1 ). More interestingly, the structural color and sensing performance still hold up well under varying ambient temperatures (−30 to 90 °C) or the mild effects of soaking, washing and freezing. This research provides a novel method for the development of intelligent fabrics with structural color and sensing capability under a range of ambient temperatures. © 2026 Society of Chemical Industry.
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产品关联
DOI
高影响因子
POLYMER INTERNATIONAL
·
2018
·Vol. 68
·期 3
·473-480
·
IF 2.352
Minghao Gao,Chao Wang,Lin Zhu,Qin Cheng,Xin Xu,Gewen Xu,Yiping Huang,Junjie Bao
To improve the electrochemical properties and enhance the mechanical strength of solid polymer electrolytes, series of composite polymer electrolytes (CPEs) were fabricated with hybrids of thermoplastic polyurethane (TPU) electrospun membrane, polyethylene oxide (PEO), SiO 2 nanoparticles and lithium bis(trifluoromethane)sulfonamide (LiTFSI). The structure and properties of the CPEs were confirmed by SEM, XRD, DSC, TGA, electrochemical impedance spectroscopy and linear sweep voltammetry. The TPU electrospun membrane as the skeleton can improve the mechanical properties of the CPEs. In addition, SiO 2 particles can suppress the crystallization of PEO. The results show that the TPU-electrospun-membrane-supported PEO electrolyte with 5 wt% SiO 2 and 20 wt% LiTFSI (TPU/PEO-5%SiO 2 -20%Li) presents an ionic conductivity of 6.1 × 10 −4 S cm −1 at 60 °C with a high tensile strength of 25.6 MPa. The battery using TPU/PEO-5%SiO 2 -20%Li as solid electrolyte and LiFePO 4 as cathode shows an attractive discharge capacity of 152, 150, 121, 75, 55 and 26 mA h g −1 at C-rates of 0.2C, 0.5C, 1C, 2C, 3C and 5C, respectively. The discharge capacity of the cell remains 110 mA h g −1 after 100 cycles at 1C at 60 °C (with a capacity retention of 91%). All the results indicate that this CPE can be applied to all-solid-state rechargeable lithium batteries. © 2018 Society of Chemical Industry
研究领域:
材料科学
·
电化学
·
高分子化学
·
能源存储
·
固态电池技术
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DOI
高影响因子
POLYMER INTERNATIONAL
·
2021
·Vol. 70
·期 9
·1396-1403
·
IF 2.99
Tingxiao Li,Yifan Huang,Lei Wang,Binjie Xin
A bead-on-string structure with special beads at the microscale level could act as an effective carrier for solid drug particles as well as giving a continuous and sustained release profile. Tetracycline hydrochloride (TCH), used as solid model drug particles, was ground to obtain nanoscale and well-distributed size. Electrospun poly[lactic- co -(glycolic acid)] (PLGA) bead-on-string nanofibers loaded with TCH of different particle sizes were fabricated for controlled drug delivery. The morphology of TCH particles and bead-on-string nanofibers were observed using a particle sizer and scanning electron microscopy. The effects of drug particle size on the release behaviors of nanofibers were further investigated and analyzed using UV–visible spectrophotometry. In vitro release results suggested that bead-on-string nanofibers encapsulating ground TCH particles had higher total drug release quantity compared with unground particle-loaded nanofibers. Coating of the surface of PLGA/TCH nanofibers was investigated for controlled-release effects and the release mechanism to understand the drug–polymer carrier interaction. The results indicated that coating on both sides of nanofibrous membranes could effectively decrease the initial burst release. Bead-on-string nanofibers proved to be promising mats for drug delivery applications. © 2021 Society of Industrial Chemistry.
研究领域:
生物材料学
·
药剂学
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DOI
高影响因子
POLYMER INTERNATIONAL
·
2018
·Vol. 67
·期 5
·528-534
·
IF 2.352
Jianguo Liu,Xiaohui Li,Chunhua Zhou
A new type of composite based on phenolic foams reinforced with red mud microparticles was prepared using a thermal foaming method. Red mud was ground into ultrafine particles with grain diameters ranging from 1 to 1.5 μm. Silane coupling agent γ -ureidopropyltriethoxysilane was used to modify the red mud microparticles to improve particle dispersion and adhesion between the particles and the phenolic matrix. The effects of the modified red mud microparticles on the mechanical and thermal properties of the composite were investigated at weight ratios ranging from 0 to 21%. The phenolic foams incorporating 15 wt% of the filler exhibited the best integrated performance. In comparison with native phenolic foams, tensile strength and impact strength were increased by 81.8 and 82.3%, respectively. Furthermore, the addition of modified red mud microparticles to the phenolic foam significantly decreased its thermal conductivity while increasing its limiting oxygen index. A morphological analysis using scanning electron microscopy indicated that incorporation of the modified red mud microparticles into the foam produced relatively small and uniformly sized cells within the material, which indicated that the observed improvements in mechanical and thermal properties were primarily due to the chemical adhesion between the particles and the matrix and good dispersion of particles in the matrix. The reinforced foams described in this study can be used in a variety of applications in the field of heat insulation. © 2018 Society of Chemical Industry
研究领域:
材料科学
·
复合材料
·
热绝缘
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DOI
高影响因子
POLYMER INTERNATIONAL
·
2025
·
IF 3.6
Kaiwen Mou,Fancheng Meng,Xiaomeng Li,Zixing Zhang,Yang Jiao,Bai Xue,Fan Zhang
Assembling various organic building blocks through carbon–carbon double-bond linkages is highly efficient for constructing high-performance organic semiconductors. Microporous/nanoporous structures can provide robust mass collection accommodation and reactive reaction sites. Here, we report the synthesis of a series of vinylene-linked conjugated porous polymers by Knoevenagel condensation of a tetratopic monomer tetramethyl-2,2′-bipyridine with different ditopic monomers. The presence of the 2,2′-bipyridine building blocks created π-extended conjugation polymeric frameworks, substantial n -type semiconducting properties and coplanar conformation. These frameworks also exhibit strong electron-deficient characters and finely tuned energy levels. Upon visible light irradiation, they exhibited the highest activity of hydrogen peroxide generation up to 1413 μmol h −1 g −1 in pure water. Their excellent recycling and reusability suggest their potential applications in green chemical transformation. © 2025 Society of Chemical Industry.
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产品关联
DOI
高影响因子
POLYMER INTERNATIONAL
·
2024
·
IF 2.9
Shilong Zhang,Youhao Xiong,Yangwei Wang,Yuqi Ma,Jialiang Li,Chaobo Jiang,Ce Wang,Yanling Zhu,Yongsheng Zhao,Guangcheng Zhang
Polyurea (PU) elastomers have attracted considerable attention in the field of protective polymeric coatings. In this work, a dithiol-terminated boronic ester was synthesized and used to incorporate dynamic boron–oxygen (B–O) bonds in the PU main chain based on thiol isocyanate while amino-terminated polydimethylsiloxane (PDMS) was introduced to retain good chain flexibility. The modified PU elastomer was found to have a microphase-separated structure in which the hard blocks served as physical crosslinks. The glass transition temperature ( T g ) slightly increases when dynamic B–O bonds exist while further introduction of PDMS soft segment can lower T g to −55.63 °C. The introduction of dynamic B–O bonds and diminished hydrogen bonding led to a decrease in mechanical strength and elongation at break. Interestingly, the simultaneous incorporation of PDMS and dynamic B–O bonds is favorable for strain rate dependence and suppressing stress relaxation. The potential for bond-exchange interactions between the dynamic B–O bonds and hydroxyl groups on metal surfaces substantially improved the adhesion of the PU elastomer to metal substrates. Therefore, our work can offer valuable insights for the structural design of functional PU coatings tailored for anti-impact applications. © 2024 Society of Chemical Industry.
研究领域:
材料科学
·
聚合物化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）