JOURNAL OF HAZARDOUS MATERIALS
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2019
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IF 7.65
Yichang Ma,Jianxian Zeng,Yajie Zeng,Hu Zhou,Guoqing Liu,Yuan Liu,Lingwei Zeng,Jian Jian,Zhengqiu Yuan
In order to separate palladium (II) from electroplating wastewaters, poly(4-vinylpyridine)-b-polysulfone-b-poly(4-vinylpyridine) (P4VP-PSF-P4VP) / polysulfone blend membranes were fabricated by combining non-solvent induced phase separation, surface segregation and self-assembly of block copolymer . Amphiphilic P4VP-PSF-P4VP was used as the membrane base material, which was synthesized by introducing the functional monomer of 4-vinylpyridine (4-VP), and polysulfone as the additive. Effects of blend ratio and 4-VP content on membrane performance, such as structure, hydrophilicity, pure water flux and adsorption capacity towards Pd (II), were investigated. The membranes exhibited dense surface structure and low roughness due to surface segregation and self-assembly of P4VP-PSF-P4VP. The presence of 4-VP increased hydrophilicity and water flux of membrane, and it also provided good adsorption capacity towards Pd (II) (up to 103.1 ± 5.15 mg/g). Further, the membrane was used to separate Pd (II) from simulated wastewaters during filtration. It showed good rejection ability and high selectivity towards Pd (II) in co-existence of Cu (II) and Ni (II), and selectivity coefficients of Pd/Cu and Pd/Ni are 41.9 ± 1.88 and 97.8 ± 4.32, respectively. In filtration process of actual electroplating wastewater, the membrane also exhibited excellent rejection performance (Pd (II) rejection reached up to 96.8 ± 2.71%). Perhaps it is suitable for future practice applications.
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
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Xinyi Chen,Yitong Ding,Mingjiao Li,Hao Wu,Ze Kan,Zhibo Li
Chemically synthesized poly(4-hydroxybutyrate) (P4HB) is a new generation of biomass-derived and degradable semi-crystalline polymer with good comprehensive properties, but high costs limit its application. Starch, as an inexpensive natural polymer , can reduce the cost of P4HB products. However, starch lacks thermoplastic behavior and has poor compatibility with P4HB, thus its extensive use will inevitably impair the mechanical properties of P4HB. In this study, the ball-milling starch grafting process is adopted, which can simultaneously solve the two major deficiencies of starch, and the prepared ball-milling starch-g-polycaprolactone (BSt-g-PCL) has thermoplasticity and better compatibility with P4HB. BSt-g-PCL can melt near 55 °C, and the interweaving of its molecular chains with P4HB reduces the binding energy ( E interaction ) of both, making the phase interface blurred or even disappear. Therefore, the elongation at break retention ( R EB ) of P4HB/BSt-g-PCL can increase from 37.1 % to 74.3 % compared to P4HB/starch at the same filling (70 Phr). Additionally, BSt-g-PCL can exert the effect of accelerating P4HB degradation and still make it maintain excellent anti-aging ability. The ball-milling starch graft process provides a simple and effective method for the preparation of inexpensive fully biodegradable P4HB composite films with excellent mechanical properties.
研究领域:
材料科学
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生物工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Yuanshuai Li,Yuting Wang,Liyan He,Lezu Meng,Haijun Lu,Xiaoli Li
In this work, a novel poly(4-vinylpyridine)-functionalized magnetic Al-MOF (Al-MOF-Fe 3 O 4 @P4VP) was synthesized successfully as an adsorbent for the adsorption of naproxen from aqueous solution. The resulting adsorbent was characterized with scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, vibrating sample magnetometer (VSM), BET surface area and X-ray photoelectron spectroscopy (XPS). Al-MOF-Fe 3 O 4 @P4VP had high surface area (123.68 m 2 /g), porous structure, rough surface and magnetic property. The maximum adsorption capacity of Al-MOF-Fe 3 O 4 @P4VP for naproxen could reach up to 31.67 mg/g and the adsorption process was well described by the Freundlich isotherm. The adsorption rate of naproxen on Al-MOF-Fe 3 O 4 @P4VP was very fast and the kinetics could be well modeled by the pseudo-second-order model. The adsorbent exhibited good adsorption ability even after ten adsorption-desorption cycles. Al-MOF-Fe 3 O 4 @P4VP had the characteristics of high removal efficiency, fast adsorption speed, good reusability and easy separation, making it a novel environment-friendly and effective magnetic nanomaterial in adsorbing naproxen from wastewater.
研究领域:
环境科学
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材料科学
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药物化学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Xinyi Chen,Sisi Tian,Yiwei Fu,Wanyi Fan,Xiaobei Liu,Yitong Ding,Ze Kan
Owing to inherent issues like interfacial stress concentration, open-cell, a low volume expansion ratio ( VER ) and cell density, the impact resistance and thermal insulation of supercritical foamed poly(lactic acid) (PLA) blend foams remain unsatisfactory. To overcome these challenges, an in-situ cross-linking strategy is employed to enhance the compatibility between PLA and poly(4-hydroxybutyrate) (P4HB), while improving the melt strength and crystallization behavior of the blends. The modified PLA/P4HB blend exhibits a blurred interfacial boundary with fewer stress concentrations. As a result, the specific impact strength increases from 9.76 to 26.17 kJ·m −2 /(g·cm −3 ) after foaming. The ambiguous interface and enhanced melt strength reduce the risk of cell wall rupture and collapse, while the increased crystallization provides additional nucleation sites. Consequently, the modified PLA/P4HB foam transitions from an open-cell to a closed-cell structure, achieving a VER of 35.4 and a cell density of 2.0 × 10 7 cells/cm 3 , representing respective increases of 16.1-fold and 9.1-fold compared to unmodified PLA/P4HB foam. At this time, the thermal conductivity and thermal diffusivity of the PLA/P4HB foam reach 31.5 mW/m·K and 8.1 × 10 −7 m 2 /s, respectively. In conclusion, this strategy provides a method for producing PLA/P4HB foams with high impact resistance and thermal insulation, and addresses common issues associated with PLA-based blends foam.
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
JOURNAL OF MEMBRANE SCIENCE
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2019
·
IF 7.015
Huawen Liu,Shanshan Yang,Yuanwei Liu,Mengjie Miao,Yan Zhao,Arcadio Sotto,Congjie Gao,Jiangnan Shen
Environmental stimuli-responsive membranes have many latent applications in numerous fields, for example, chemical/biological separations, water treatment, drug delivery, self-cleaning material and chemical sensor. In this study, a pH-responsive membrane with in-situ assembled stimuli-responsive microgels on membrane surface and internal channels wall was fabricated by the coagulation step of the phase-inversion process. Interestingly, it was found that poly(4-vinyl pyridine) (P4VP) microgel can be mobilized onto the membrane surface by using an acidic coagulation bath. Meanwhile, the membrane-based materials with different hydrophobic properties showed a great effect on the migration of microgel onto the channel surface. The inner pores of these responsive membranes can self-adjust its size with the changes of outside pH stimulus. Moreover, the gate-controlled water permeability of pH-responsive membranes was explored at the pH interval from pH 2 to pH 6. Investigations revealed that the P4VP microgel-assembled membrane had excellent pH-responsive performance. In addition, these pH-responsive membranes with embedded microgels on surface and inner pores wall also exhibited excellent reversible behaviors and self-cleaning properties.
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
SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2019
·
IF 6.019
Jinming Zeng,Hui Li,Zhijun Wan,Lianghui Ai,Ping Liu,Wenji Deng
Poly(4-vinyltriphenylamine) (PVTPA) was synthesized, and cross-linked poly(4-vinyltriphenylamine) (PVTPA-CL n ) films with a thickness of 260 nm (CL1), 510 nm (CL2), and 680 nm (CL3) were prepared by electropolymerization . Using the PVTPA-CL2 and PVTPA-CL3 films as active materials, the electrochromic devices (ECDs) were fabricated. The structures of the devices were indium tin oxide (ITO) glass/gel electrolyte/PVTPA-CL2/ITO glass (ECD 1) and ITO glass/gel electrolyte/PVTPA-CL3/ITO glass (ECD 2). The electrochromic properties of the PVTPA, PVTPA-CL n films, and ECDs were investigated. Among them, the PVTPA-CL2 and PVTPA-CL3 films exhibited reversible color changes from colorless to gray-green and from colorless to black upon electrochemical doping and dedoping, respectively. The optical contrast of the PVTPA-CL2 and PVTPA-CL3 films were 81.0% and 84.3% at 750 nm, respectively. The ECD 1 could reversibly change between colorless and gray-green under different voltages, and it exhibited 78.3% optical contrast at 750 nm. Notably, ECD 2 could reversibly change between colorless and black under different voltages, and it exhibited 85.0% optical contrast at 750 nm. ECD 1 had shorter switching time than ECD 2, its coloring and bleaching times were 9.5 and 7.3 s, respectively. Both ECD 1 and ECD 2 exhibited reasonable electrochemical cyclic stability.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2019
·
IF 2.298
Yue Sun,Weisheng Zheng,Rajendra Prasad Singh,Li Chen
In the current work, poly(4-vinylpyridine) (P4VP) was grafted on a macroporous polystyrene resin via free-radical polymerization by using the pendent vinyl group. The grafting conditions such as swelling agent, initiator concentration, reaction temperature, and amount of 4-vinylpyridine (4VP) monomer were optimized, and three resins with different 4VP monomer amounts (SC-1, SC-2, and SC-3) were chosen as adsorbents. P4VP-grafted resins were characterized by scanning electron microscopy, N2 sorption/desorption isotherms, Fourier transform infrared, and X-ray photoelectron spectroscopy. The sorption properties of 2-naphthalenesulfonic acid (NSA) on three resins were comparatively investigated. The experimental data revealed that the sorption process on three resins fitted well with the pseudo-second-order kinetics equation, and the equilibrium isotherms were in good agreement with the Langmuir model. The NSA sorption onto resins was an endothermic and spontaneous process, and SC-3 loaded with NSA can be efficiently regenerated by NaOH and ethanol mixed solution after sorption. The maximum sorption capacities of three resins indicated that P4VP-grafted resins possess good sorption ability toward NSA.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
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2014
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IF 3.242
Bolin Li,Xiaolin Lu,Yonghao Ma,Zhan Chen
A novel thermo- and pH-responsive poly(acrylic acid) (PAA)/poly(4-vinylpyridine) (P4VP) aqueous material with an upper critical solution temperature (UCST) was developed in this study. It was found that the formation of the aqueous complex material was caused by the deprotonation of pyridinium groups of P4VP molecules and consequent hydrogen bonding formation between pyridine and carboxylic groups. This aqueous material exhibited significant reversible transition behaviors between the turbid colloidal and transparent solution states upon altering the pH and temperature values. Furthermore, the correlation between the solution pH and the upper critical solution temperature (UCST) enables us to design responsive aqueous materials with a broadly adjustable transition temperature range.
研究领域:
高分子化学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
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2015
·
IF 3.615
Shuang Fan,Yi Luan,Jingjing Wang,Hongyi Gao,Xiaowei Zhang,Ge Wang
A novel ferric chloride immobilized poly(4-vinylpyridine) (P4VP) catalyst was developed via a coordination chemistry-based approach. The pyridine moiety of poly(4-vinylpyridine) spheres functioned as the nitrogen donor to bind iron ions, as well as to decrease the amount of pyridine used in the catalytic reaction system. The monodispersed catalyst was well dispersed in the organic solvent during the catalytic procedure, taking advantage of its nanomorphology and uniform size. The catalytic activity of various monodispersed catalysts based different mass fractions of the divinylbenzene (DVB) was investigated, meanwhile the capacities of supported Fe(III) in the various catalysts were also discussed. The P4VPDVB 10% -Fe(III) catalyst exhibited high catalytic activity in the benzylic oxidation of benzylic methylenes and secondary benzylic alcohols. It was easily separated from the reaction system and reused several times without obvious degradation of catalytic activity. Moreover, leaching tests suggested that the as-synthesized P4VPDVB 10% -Fe(III) catalyst was a true heterogeneous catalyst without significant metal leaching.
研究领域:
化学
·
催化材料科学
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DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 8
·2908-2915
·
IF 3.665
Shuai Wen,Qiang Liu,Wentian Liang
The linear benzyl chlorine-free poly(4-acetoxystyrene) (PSTO) with low polydispersity ( M w / M n = 1.3) is obtained through anisole quenching of the living polymerization of 4-acetoxystyrene initiated with the St–Cl/SnCl 4 /n-Bu 4 NBr system in CH 2 Cl 2 . The alkylation reaction rate increases with increasing anisole concentration and temperature. With a 4-fold excess of anisole over the initiator, end-chlorine groups are completely capped by anisole in 30 minutes at −15°C through adding extra SnCl 4 prior to the alkylation reaction. In addition, by using 2-methylanisole and 2,6-dimethylanisole as capping agents, it is verified that both para- and ortho-positions substitution of living PSTO cations to the anisole occur during alkylation reactions.
研究领域:
高分子化学
·
材料科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
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IF 10.652
Jinming Zeng,Hui Yang,Chaofa Zhong,Karthikeyan Rajan,Rizwan Ur Rehman Sagar,Xiaopeng Qi,Yiqun Deng,Honghui Jiang,Ping Liu,Tongxiang Liang
Electrochromic materials are getting huge attention of recent research owing to their vast applications in the optoelectronic research field. Herein, poly(4-vinyltriphenylamine) (PVTPA) was chemically synthesized. The cross-linked poly(4-vinyltriphenylamine) (PVTPA-CL) film with a thickness of ~480 nm was prepared by electropolymerization process. The color complementary ambipolar electrochromic devices (ECDs) were fabricated using the PVTPA-CL films and ethyl viologen (EV) or tungsten trioxide (WO 3 ) as electrochromic active materials. The structures of ECDs were indium tin oxide (ITO) glass/PVTPA-CL film/GE-1 (PMMA:LiClO 4 :ACN:PC:EV = 7:3:30:60:3.5, w / w )/ITO glass (ECD 3), ITO glass/PVTPA-CL film/GE-2 (PMMA:ACN:PC:EV = 7:30:60:3.5, w / w )/ITO glass (ECD 4), and ITO glass/PVTPA-CL film/GE-3 ((PMMA:LiClO 4 :ACN:PC = 7:3:30:60, w / w )/WO 3 /ITO glass (ECD 5). The electrochromic properties of ECDs were investigated. All the ECDs exhibited reversible color changes between colorless and black under different voltages. Furthermore, ECDs also exhibited high optical contrast in visible and near-infrared region; the optical contrast of ECD 3, ECD 4, and ECD 5 are greater than 62.9%, 61.2%, and 70.6% in the 430–800 nm range, respectively. Compared with ECD 3 and ECD 4, ECD 5 exhibited higher optical contrast in the near-infrared region and shorter switching time, and its coloring and bleaching times were 4.6 s and 3.0 s, respectively. Ambipolar color-complementary colorless-to-black electrochromic device (ECD 5) based on PVTPA-CL and WO 3 films is promising for electrochromic smart windows.
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
MATERIALS CHEMISTRY AND PHYSICS
·
2015
·
IF 2.259
Yang Li,Taotao Wu,Mujie Yang
Nanocomposites of quaternized and crosslinked poly(4-vinylpyridine) (QC-P4VP) and silver nanoparticles were prepared by a two-step procedure, and characterized by Fourier-transform infrared spectroscopy, Ultraviolet–visible spectroscopy and scanning electron microscopy. Bilayer-structured humidity sensors based on the nanocomposites were fabricated, and the effects of the concentration of silver salt precursor and poly(4-vinylpyridine), the method for the reduction of silver salt, the deposition order of the sensitive layers and environmental temperature on the humidity sensing characteristics of the composite sensor have been examined at room temperature. The composite sensor exhibited low impedance under dry atmosphere due to the introduction of Ag nanoparticles, and could detect very low relative humidity (RH) (down to 1% RH) with good sensitivity (impedance change of 2000% from 1% to 30% RH). In addition, the composite sensor demonstrated very wide measuring range (1–98% RH), and revealed faster response and smaller hysteresis than the sensor based on QC-P4VP alone. The complex impedance spectra of the composite sensor in the environments with different RH levels were investigated to explore its humidity sensing mechanism.
研究领域:
材料科学
·
传感器技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）