CARBOHYDRATE POLYMERS
·
2015
·
IF 4.074
Ting Lu,Tao Xiang,Xue-Lian Huang,Cheng Li,Wei-Feng Zhao,Qian Zhang,Chang-Sheng Zhao
Post-crosslinking as a new strategy to prepare sodium alginate (SA) beads with controllable swelling behavior, pH sensitivity and adsorption capacity was developed by using the solution of glutaraldehyde (GA), acetic acid and hydrochloric acid as the coagulating agent, for which could be used to fabricate polysaccharide beads in a large scale. Fourier transform infrared spectroscopy and thermogravimetric analysis convinced the successful cross-linking of SA by GA. The macro-porous structures of the beads were observed by scanning electron microscopy. Both acetic acid and hydrochloric acid had great effects on the swelling behavior and pH sensitivity of the SA beads. The SA beads could adsorb cationic dye (methylene blue) as high as 572 mg/g and other metal ions (Cu 2+ , Ag + and Fe 3+ ). The adsorption processes fitted well with the pseudo-second-order kinetic model and the Freundlich isotherm. The large-scale production of SA beads with tunable properties opens a new route to industrially utilize polysaccharide beads in wastewater treatments, intelligent separation and so on.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Shengqiu Chen,Yi Xie,Tianjue Xiao,Weifeng Zhao,Jianshu Li,Changsheng Zhao
A facile and versatile strategy towards antifouling surfaces is an emerging area of huge potential and with an increasing scientific interest. Herein, a universal approach for fabricating antifouling surfaces was developed based on tannic acid (TA) and a novel reactive zwitterionic polymer. Firstly, a thin layer was formed on polyethersulfone (PES) membranes surface with TA molecules via multivalent anchoring sites in few minutes. Subsequently, a reactive zwitterionic polymer (for the first time reported based on quaternization of PEI) was post-crosslinked on the layer via a convenient dip-coating process at room temperature. The as-prepared surface exhibited excellent hydrophilicity confirmed by water contact angle, and its electrically neutral property was affirmed by zeta potential measurement. The surface displayed prominent antifouling efficacy which was evaluated by proteins adsorption, bacteria attachment and platelets adhesion. Meanwhile, after the post-crosslinking, the stability of the surface was significantly enhanced in either acidic or alkaline condition compared with original TA-coated surface. Benefiting from the universal profile, easy operation and low cost of the TA assembly process, as well as the excellent antifouling ability of the zwitterionic polymer, the proposed strategy provided a universal route in design of antifouling surfaces used in biomedical fields.
研究领域:
材料科学
·
生物医学工程
·
表面化学
✓ 已验证
DOI
高影响因子
POLYMER INTERNATIONAL
·
2011
·Vol. 60
·期 9
·1287-1290
·
IF 2.056
Qingquan Liu,Yingxiang Duan,Shaohua Shen,Zhihua Zhou
Pomegranate-like polystyrene-based microspheres with high porosity were successfully prepared via a simple route involving two steps. The first step was the preparation of polystyrene-based microspheres with multi-cores and a non-porous shell via suspension polymerization of divinylbenzene and vinylbenzyl chloride. Nitrogen sorption failed to characterize the pore structure of the microspheres because of the non-porous shell, but the results of Hg intrusion indicated that the pore volume of the microspheres was 0.36 cm 3 g −1 . The second step was post crosslinking of the microspheres derived from the first step. Extensive porosity was generated in the shell and the pomegranate-like structure of the microspheres remained almost unchanged. The results showed that the pore volumes of the final products derived from N 2 sorption and Hg intrusion were 0.54 cm 3 g −1 and 0.66 cm 3 g −1 , respectively. Overall, this provides a simple and feasible route to biomimetic preparation of pomegranate-like polystyrene-based microspheres with high porosity. Copyright © 2011 Society of Chemical Industry
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Jiayi Zheng,Lei Hu,Xianda He,Yao Liu,Xiaojie Zheng,Shunhui Tao,Xiaoqing Lin
Development of energy and resource-efficient processes to convert sustainable agricultural and forestry waste into valuable platform compounds, such as 5-hydroxymethylfurfural (5-HMF), has become an important research area for promoting a bioeconomy. However, separation and purification of 5-HMF from hydrolysate is a major challenge for its large scale industrial production. In this work, a series of novel polar-modified post-cross-linked resins were synthesized by oil/water suspension polymerization, post-cross-linked, and amination reactions using different monomer/cross-linker ratios. Different mass percentages of toluene were also included as a porogen. The effect of pore structure on the equilibrium capacity of 5-HMF onto resins using both single and ternary-component systems was investigated. The results showed that the post-cross-linked resin with ethylene glycol dimethacrylate/divinylbenzene (at 1:4 w/w) with 100% (w/w) toluene had the largest BET surface area (1075 m2/g). The largest 5-HMF equilibrium capacity was 65.8 ± 1.3 mg/g in the single-component system and 57.9 ± 1.3 mg/g in the ternary-component system. Additionally, the maximum selectivity values of 5-HMF-FA and LA-FA are 26.6 and 14.2 on PCL-PDE resin with the 100% toluene mass percentage. Furthermore, the average pore diameter and BET surface areas of the resin played a significant role in the adsorption process of 5-HMF from both single- and ternary-component systems. In all, this research provides an important theoretical and practical screening method for the directed design of adsorbents for 5-HMF separation and purification.
研究领域:
生物化学
·
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Huan Wang,Yuhua Wang,Xiaoling Sun,Huiping Hu,Qifan Peng
In this paper, two aminated post-cross-linked polystyrene resins, PSAMPpc and PSAPpc, were correspondingly synthesized from macroporous chloromethylated polystyrene beads (PS-Cl) via a two-step process with amination reaction and Friedel-Crafts reaction. The structures of the resins were characterized by Fourier transform infrared spectrum (FT-IR), Elemental analysis and N 2 adsorption-desorption isotherms, respectively. And the adsorption performances of the resins towards benzene sulfonic acid (BSA) were systematically evaluated by the conduction of batch adsorption experiments. It was indicated that the introduced functional groups greatly improved polarity of the resins, and the Brunauer-Emmett-Teller (BET) surface area was increased after Friedel-Crafts reaction. Furthermore, it was showed that the aminated post-cross-linked PSAMPpc and PSAPpc performed enhanced adsorption capacities in comparison with amino-modified macroporous polystyrene resins PSAMP and PSAP, and the maximum adsorption capacities of PSAMPpc and PSAPpc fitted by Langmuir isotherm model were 370.4 mg/g and 454.5 mg/g (dry basis), respectively. Additionally, the existence of sulfate anion decreased the adsorption capacity of the resins towards BSA from aqueous solutions, whereas PSAMPpc behaved better adsorption selectivity of benzene sulfonic anion over sulfate anion in comparison with PSAPpc. Moreover, with respect to the dynamic adsorption-desorption experiments, the dynamic saturated adsorption capacities of PSAMPpc and PSAPpc were calculated to be 201.21 and 333.62 mg/g (dry basis), respectively. It was found that the BSA-loaded resins could be well regenerated by 0.01 mol/L of NaOH aqueous solution, and PSAMPpc and PSAPpc resins also exhibited satisfactory adsorption efficiencies even after five-cycle adsorption-desorption operations.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Meiying Ge,Jia-Tao Miao,Guozheng Liang,Aijuan Gu
Developing superior heat resistant biobased thermosetting resins is an interesting challenge. Herein, a novel tetra-functional biobased epoxy monomer with phenylpropargyl ether groups (BPBMO) was synthesized, which was then cured with 4,4′-diaminodiphenylmethane (DDM) to produce a biobased resin (BPBMO/DDM), the aggregation structure and integrated properties of BPBMO/DDM were systematically researched and compared with those of commercial petroleum-based DGEBA/DDM. Glass transition temperature ( T g ) of BPBMO/DDM is as high as 407 °C, which is not only about 207 °C higher than that of DGEBA/DDM, but also the highest value among all biobased epoxy resins reported. Besides, BPBMO/DDM resin shows higher flame retardance with lower peak heat release rate (pHRR), total heat release (THR) and total smoke production (TSP) than those of DGEBA/DDM. These outstanding performances were beneficial from the unique structure of BPBMO/DDM formed with the ring open reaction between epoxy and amino groups as well as the post-crosslinking of phenylpropargyl ether groups. This work proposes an effective post-crosslinking strategy from the molecular structural design to construct an ultrahigh heat resistant biobased epoxy resin with good flame retardancy.
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
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 27
·47716
·
IF 2.188
Fenghao Guo,Yinping Wang,Xilu Chen,Mingqian Chen,Wei He,Zhiyong Chen
Cryogels are supermacroporous but restricted by lack of surface area in utilization to date. We here propose a method for fabrication of supermacroporous polydivinylbenzene (PDVB) cryogels with high surface area by redox-initiated cryopolymerization combined with solvothermal postcrosslinking technique. The PDVB precursor cryogels are prepared by redox-initiated cryopolymerization, followed by postcrosslinking of residual double bonds to form hypercrosslinked cryogels under solvothermal conditions. The hypercrosslinked cryogels maintain the original supermacroporosity and display very high surface area up to 1462 m 2 g −1 . We demonstrate the utilization of the resultant cryogel in uptake of carbon dioxide (7.9 wt % at 1 bar and 62.2 wt % at 25 bar, respectively) and uptake of aniline (333.3 mg g −1 at room temperature) from aqueous solutions. The adsorption behaviors of aniline on the hypercrosslinked cryogels are found to follow Langmuir model as well as Freundlich model in equilibrium adsorption and to follow pseudo-second-order model in kinetic adsorption, respectively. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47716.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Batteries-Basel
·
2023
·Vol. 9
·期 9
·465
·
IF 4
Zhenan Zheng,Jie Huang,Xiang Gao,Yingwu Luo
The solid polymer electrolyte is a promising candidate for solid-state lithium battery because of favorable interfacial contact, good processability and economic availability. However, its application is limited because of low ionic conductivity and insufficient mechanical strength. In this study, the delicate molecular structural design was realized via controlled / “living” radical polymerization in order to decouple the trade-off between ionic conductivity and mechanical strength. The random and triblock copolymer electrolytes were designed and synthesized to investigate the influence of molecular structure on ionic conduction, while a chemical cross-linking network was constructed via a semi-spontaneous post-crosslinking reaction. Compared with a random counterpart, the triblock copolymer electrolyte presented stronger chain segment motion and a liquid-like mechanical response due to the independent ion-conducting block, resulting in significantly improved ionic conductivity (from 6.29 ± 1.11 × 10−5to 9.57 ± 2.82 × 10−5S cm−1at 60 °C) and cell performance. When assembled with LiFePO4and lithium metal electrodes, the cell with triblock copolymer electrolyte showed significantly improved rate performance (150 mAh g−1at 1 C) and cycling life (200 cycles with 92.8% capacity retention at 1 C). This study demonstrates the advantages of molecular structure regulation on ionic conduction and mechanical support, which may provide new insights for the future design of solid polymer electrolytes.Keywords:solid polymer electrolyte;molecular structure regulation;semi-spontaneous post-crosslinking reaction
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2023
·Vol. 301
·期 6
·613-622
·
IF 2.4
Shu Dan,Tu Sicong,Mai Shuting,Xu Jian,Yang Wuli
Cross-linked polymer microspheres are widely used in biomedicine, flat panel display, analytical testing, in vitro diagnostics, semiconductor chips, and light diffusion. However, the process of preparing micron-sized cross-linked polymer microspheres is complicated, and it is difficult to obtain a high crosslinking degree conveniently. In this work, we applied post-crosslinking strategy to prepare poly (methyl methacrylate) (PMMA) microspheres having a high crosslinking degree by dispersion polymerization, while the method separated the polymerization process and cross-linking process of microspheres. In the method, the silane coupling agents containing double bonds were used as the comonomer in polymerization and hydrolyzed to form Si–O–Si cross-linked structure at the later stage. The obtained microspheres are not only highly cross-linked but also have uniform particle size distribution and good thermal stability. The produced cross-linked PMMA microspheres exhibit great light diffusion properties and might be employed as a light diffusion agent in a polycarbonate matrix. Graphical Abstract We prepared the cross-linked PMMA microspheres by post-crosslinking method and mixed the cross-linked PMMA microspheres with the matrix PC to obtain the light diffusers.
研究领域:
材料科学
·
光学工程
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Jianwei Bai,Xiaofei Ma,Cen Gong,Yiming Chen,Huijun Yan,Kewei Wang,Jun Wang
Traditional adsorption resin prepared by a low efficiency method has a low porosity and surface area , which limits the adsorption performance of the resin. Therefore, a novel porous resin was developed by structural design of the resins through post- modification with HPA and a post-crosslinked method. The novel porous post-modification resin was successfully prepared by the multistep method. Meanwhile, the high surface area and abundant micropores in HCR-AO can improve the adsorption rate by accelerating the diffusion of uranium in the external diffusion stage. The removal capacity of HCR-AO increased 366% for HCR and 120% for PSD-AO at the same initial concentration. HCR-AO takes less time to reach equilibrium than PSD-AO and HCR. Excitingly, the adsorption amount of the material dropped only slightly even after 8 cycles. The short equilibrium time and outstanding removal efficiency makes it a novel candidate for further extraction of U (VI) from seawater .
研究领域:
环境化学
·
核化学
·
材料科学
·
吸附分离
·
海洋资源提取
✓ 已验证
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Yunlong Chen,Wei Lu,Jinliang Li,Chang Xu,Yang Li,Jinhu Li
To address the problem of respirable dust control during coal seam mining, this paper proposed a stepwise polymerization strategy – “prior penetration followed by cross-linking” – and developed a double network (DN) gel dust suppressant HPMC-g-HPA/AM. Composed of the dust suppressant base solution (DSP) and the initiator, the dust suppressant can achieve in-situ cross-linking and solidification within coal seams to control dust. Experimental results demonstrated that DSP exhibits low viscosity, high permeability and excellent wettability, and can efficiently penetrate coal seams, while the initiator has even lower viscosity and better permeability, with a penetration rate 2.11 times that of DSP. The significant rheological difference between the two ensures the implementation of the stepwise strategy. After DSP and the initiator successively penetrate fractures and pores of coal seams, they undergo in-situ cross-linking to form a “flexible – rigid” DN gel. This significantly enhances the moisture retention capacity and mechanical properties of coal. The gel improves the dust adsorption and agglomeration capacity through the chemical anchoring effect combined with polar groups of coal, and further inhibits dust dispersion through the physical encapsulation effect, thereby reducing the dust generation rates by 47.16 % (≤180 μm) and 55.89 % (≤75 μm). The respirable dust proportion decreases from 12.08 % to 7.58 %, achieving effective respirable dust control and ensuring occupational safety.
研究领域:
环境工程
·
矿业安全
·
材料科学
·
职业健康
·
高分子化学
·
流变学
·
煤化学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 32
·46579
·
IF 1.901
Xie Li,Wei Li,Zhiqing Liu,Xiaolin Wang,Heling Guo,Rongjie Wang,Xuhong Guo,Cuihua Li,Xin Jia
Polyurethane (PU) has been widely used as a glue in various areas. However, adhesion in the presence of water is greatly impeded and results in most synthetic adhesive failure. In this study, we designed and synthesized a novel PU construction; underwater PU adhesives were created by the incorporation of synthetic glycerol monomethacrylate (GMA). Furthermore, the urethane structure helped the adhesive eliminate the interfacial water barrier through interactions that were stronger than hydrogen bonding, and GMA as a crosslinking agent was used to generate post-covalent-crosslinking networks through radical polymerization. This enhanced the cohesion so the diffusion of water molecules could be overcome. Fourier transform infrared spectroscopy, thermogravimetric analysis, underwater adhesion measurements, and tensile tests were used to characterize the chemical and mechanical properties of the as-obtained adhesive. This led to an adhesive with a better mechanical strength and interfacial adhesion in water, and the results show that the mechanical properties (tensile strength, Young's modulus, and tensile elongation) of the GMA–PU adhesive were higher than those of the pure PU. As for the 4% GMA, the tensile strength was enhanced by 24.3% and the elongation was enhanced by 125.23% over those of the pure PU. This confirmed that the incorporation of GMA into the PU matrix indeed induced increasing cohesion, and the sample's adhesive strength was 21.19 ± 3.9 MPa; this indicated a superior adhesive strength over that of the pure PU. In addition, we can foresee that underwater adhesion will play an important role in prospective surgery and engineering areas. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46579.
研究领域:
高分子材料
·
生物医学工程
·
粘附科学
·
组织工程
·
医用胶粘剂
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）