REACTIVE & FUNCTIONAL POLYMERS
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2024
·
IF 4.5
Zixu Xie,Chen Chen,Xinyu Chen,Fanqiang Bu,Guofeng Li,Pengfei Zhang,Xing Wang
Polyester is widely used in biomedical, textile, and food packaging fields. Therefore, enhancing it with antimicrobial properties would be a significant advancement. In this paper, a series of borneol-triazine polyesters (BTPs) with different structures are synthesized through room temperature polycondensation . The structure and composition of BTPs are systematically characterized by 1 H NMR, FTIR and GPC . Antimicrobial results reveal that the ability of BTPs to resist bacterial or fungal adhesion is directly related to the polymer structure . When the polymer chain of BTPs adopts a rigid structure, they exhibit excellent anti-adhesive and inhibitory performances against both Gram-negative bacteria ( Escherichia coli ) and Gram-positive bacteria ( Staphylococcus aureus ). Meanwhile, the as-synthesized BTPs poses a fungal-repelling effect on common fungal strains ( Aspergillus niger ) for up to 30 d. Further studies have shown that a stereochemical structure brought by borneol is key for imparting effective antimicrobial properties to BTPs. In addition, BTPs are non-leaching materials with low cellular cytotoxicity. Taking into consideration, BTP provides a potential strategy for preparing a new class of antimicrobial polyester materials .
研究领域:
材料科学
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生物医学工程
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抗菌材料研究
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产品关联
DOI
高影响因子
JOURNAL OF RHEOLOGY
·
2017
·Vol. 61
·期 1
·107-116
·
IF 3.136
Dong Renfeng,Peng Jun,Chang Xueyi,Zhang Qilu,Hong Liangzhi,Ren Biye
Hydrophobically modified ethoxylated urethanes (HEURs) have been widely used as effective thickeners for improving the solution rheological properties in a variety of applications for over 40 years. We designed and prepared a novel photosensitive spiropyran-functionalized HEUR polymer ( SP-HEUR ), which was used to investigate the influence of hydrophobicity change of hydrophobes induced by photoisomerization of spiropyran (SP) group on the solution aggregation and rheological properties. The concentrated SP-HEUR solutions show an interesting photoresponsive rheological behavior upon alternative exposure to ultraviolet and visible light due to a reversible SP- to merocyanine-form conversion and back. A reversible rearrangement of micellar junctions through loop-bridge or bridge-loop transitions is proposed to interpret the influence of photoisomerozation of spiropyran groups on the associative structure and rheological properties of the polymer solution. This work will not only provide new insights into the influence of hydrophobicity change of hydrophobes on the associative structure and rheological properties of HEUR solutions but also opens a new perspective for the development of some special applications of HEURs in the manufacturing and transmission of soft materials, waterborne coating, inks, medicines, cosmetics, and so on.
研究领域:
材料科学
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化学工程
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软物质物理
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产品关联
DOI
高影响因子
POLYMER
·
2020
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IF 4.231
Yudi Guo,Erqing Zhao,Xijuan Zhao,Chenyang Zhang,Lu Yao,Xiaowei Guo,Xiaoping Wang
The synergistic effects of electric field and polymer structures were innovatively introduced to achieve uniform, beads-free, and robust superhydrophobic electrospun fibers. Aminopropyl triethoxysilane (APTES) terminated block copolymers of APTES-poly (methyl methacrylate)- b -poly (dodecafluoroheptyl methacrylate) (APTES-PMMA- b -PDFMA) and APTES-polystyrene- b -PDFMA (APTES-PS- b -PDFMA) were synthesized via atom transfer radical polymerization (ATRP) and electrospinning in a positive electric field. Uniform, beads-free, and robust superhydrophobic electrospun films were fabricated with APTES-PS- b -PDFMA involving small amount of PDFMA segment. XPS results display that effective surface fluorine enrichment is more easily achieved on APTES-PS- b -PDFMA than on APTES-PMMA-b-PDFMA which involves large amount of DFMA. The mechanism can be summarized as follows: negatively charged block PS in positive electric field migrates towards the core of electrospinning jets, and block PMMA has a better positive charging stability than block DFMA, resulting in preferential surface segregation . This investigation will provide an important instructive value in controllable fabrication of robust superhydrophobic electrospun films applied in the fields of textiles, oil-water separation, membrane distillation, etc.
研究领域:
材料科学
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表面化学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2022
·Vol. 139
·期 48
·e53236
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IF 3.057
Zhengyun Xie,Kai Li,Wei Tang,Shulan Yang,Yanlin Sun
The “all in one” multifunctional and concentrated daily chemical products are required by the market, such as the long-term release of anti-bacterial, medical, or perfume agents. These functions mainly rely on the microcapsules, which could encapsulate these functional and unstable molecules, and then release them in the long term. To stabilize these functional solid particles in a high-content surfactant, it is necessary to add a suspending rheological modifier. The poly(acrylic acid) (PAA)-based rheology modifier is one of the most common additives in the industry of daily chemicals, for thickening or suspending. In this paper, linear PAA, and branched PAA polymers (Carbomer 941 and Carbomer 940) were selected to study the suspending ability of PAA-based rheology modifier in high-content surfactant and to investigate the effect of PAA polymer structure and M w on the complex solution's rheological properties. The yield and viscosity test of the complex solutions of linear PAA and high-content surfactant revealed that the addition of linear PAA could lead to lower yield stress and viscosity, and failed to suspend the polystyrene (PS) model microspheres due to its smaller mean square radius of gyration. The branched PAA polymer, Carbomer 940 and Carbomer 941 were more stable than the linear PAA in these two kinds of surfactant. More specifically, Carbomer 940 with a higher M w, would exhibit higher yield stress and viscosity than Carbomer 941 with a lower M w in nonionic surfactant alcohol polyoxyethylene ether (AEO) solvent with content less than 5 wt%. When the content was higher than 5 wt%, Carbomer 941 presented higher yield stress and viscosity than Carbomer 940, and successfully suspended PS microspheres in the 20 wt% AEO solution. This could depend on the polymer chain's elongation state of these two PAA-based branched rheology modifiers. The same trend happened in the appearance of Carbomer 940 and Carbomer 941 in alcohol ether sulphate (AES) solution. However, the electrostatic repulsive force between the AES and PAA-based rheology modifier could further make the polymer chain curl up and restrain the suspending ability in a lower content surfactant solution. Therefore, this fundamental research could guide the application of the anionic polyelectrolytes in the concentrated daily chemical product for stable suspending particles.
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
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 29
·14624-14633
·
IF 11.301
Changren Xiao,Guoqing Zhang,Zhenghui Li,Xiaoqing Yang
Despite being an advanced battery thermal management (BTM) strategy, the phase change material (PCM) cooling technology still suffers from the low thermal stability of the PCMs in practical applications, which leads to the leakage of the phase change ingredient, shape change or even collapse concerns under high temperature. Here we propose a creative idea for constructing a cross-linked polymeric structure with aliphatic side chains, namely, polymer PCM (PoPCM), through a facile one-step free-radical polymerization of octadecyl acrylate and crosslinkers. The aliphatic chains “tied up” on the cross-linked polymeric skeleton via “chemical bonding” and provided a high latent heat of 98.8 J g−1 without leakage, and therefore, delivered a stable solid–solid phase change behavior during long-term operation. The thermosetting 3-dimensional cross-linked structure simultaneously endowed the PoPCM with the anti-volume-expansion capability and excellent heat tolerance up to 250 °C without any deformation or leakage. When applied for BTM, the solid–solid PoPCM module demonstrated excellent and stable heat dissipation performance. The maximum temperature was 45.3 °C, and the temperature difference of the battery module could be controlled below 3.1 °C during the cyclic charge–discharge tests. Combining with the industrially available reagents and the simple preparation procedure at the kilogram level, we believe that this new strategy can present PCMs with superior feasibility for practical application in BTM.
研究领域:
材料科学
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能源工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Wei Xiong,Xiaoyan Li,Xue Ye,Yonghuan Fu,Yaqi Lei,Tao Huang,Shenghua Ye,Xiangzhong Ren,Chuanxin He,Shunwei Chen,Qianling Zhang,Jianhong Liu
Hierarchical polymer architectures have attracted considerable attention owing to their crucial roles in catalysis, drug delivery, biology, electronics and energy storage fields. Unfortunately, the current synthesis of polymer particles with hierarchical structures mainly relies on templates, hydrothermal devices, surfactants, and catalysts approaches that have the disadvantages of time-consuming procedures, complex manufacturing processes, high cost, the use of toxic agents (e.g. HF acid for templates removal) and potential risk of explosion (hydrothermal methods). Herein, for the first time, we have developed an ultrafast template-free, hydrothermal-free, surfactant-free, and catalyst-free precipitation polymerization method to synthesize a diversity of polymer particles with multi-dimensional (0D, 1D, 2D and 3D) hierarchical structures simply from polymerization of common dual-aldehyde and amino monomers at room temperature, and the fabrication process only took 10 min. After carbonizing one typical polymer particles (wool-ball-like structure) as an application example, we further tested the electrochemical performance of the as-obtained typical structures and the results show a reversible lithium-ion storage capacity of 226.5 mAh g −1 after 3200 cycles at the current density of 5 A g −1 . Our technique provides a cost-effective, rapid, scalable, and green approach to prepare multi-dimensional hierarchical polymer structures and paves the way towards their application in a diversity of emerging fields.
研究领域:
材料科学
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能源存储
·
化学工程
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DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2022
·Vol. 223
·期 18
·2200059
·
IF 2.996
Qidi Huang,Jianai Chen,Xiongchao Shao,Yujie Dong,Weijun Li,Cheng Zhang
Electrochromic small molecules suffer from the difficult film processibility and serious dissolvability at their oxidation state, which greatly limit their applications in electrochromic areas. Here, well-defined electrochemical polymer structures, pCZ-FSQ and pCZ-FEQ, are obtained by taking advantage of the unique electrochemical dimerization of carbazole, and low redox-potential phenothiazine and phenoxazine groups are introduced as an electrochromic color-changing unit with the interruption of conjugation between them via an alkyl chain linkage. The obtained polymer films pCZ-FSQ and pCZ-FEQ are composed of the independent dimeric carbazole and organic small molecule units. Finally, they exhibit outstanding electrochromic properties with optical contrast of more than 50%, switching time of less than 1 s, excellent stability (over 500 cycles of optical stability), and ultrahigh coloration efficiency (276 cm 2 C −1 for pCZ-FSQ , 384 cm 2 C −1 for pCZ-FEQ). This is thought to be greatly attributed to the well-defined electrochemical polymer structures with dual electrochromic color-changing properties of both phenothiazine/phenoxazine and dimeric carbazole. This can also provide some implications for the future in-depth study of small molecule electrochromism and the solution to the problem of difficult processing of small molecules.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
Polymer Chemistry
·
2023
·Vol. 14
·期 32
·3679-3685
·
IF 4.6
Yongzhuang Du,Xiaoqiang Xue,Qimin Jiang,Wenyan Huang,Hongjun Yang,Li Jiang,Bibiao Jiang,Sridhar Komarneni
The ring-opening mechanism of epoxides in the presence of tertiary amines was studied in this work. Gas chromatography (GC) and size-exclusion chromatography (SEC) were used to measure the monomer conversion and molecular weights of the polymers. Nuclear magnetic resonance (NMR) spectroscopy was used to analyze the polymer structures. It has been found that only in the system where tertiary amines and hydroxyl-containing compounds coexist can the ring-opening reaction occur, indicating that there is an interaction between tertiary amines and the hydroxyl groups, which is confirmed by the NMR analysis of a mixture of triethylamine (TEA) and ethanol (EtOH), and the polymerization of TEA and glycidol (GL). As for normal epoxides, such as propylene oxide, polymers contained tertiary amine moieties before and after dialysis, suggesting that the tertiary amine moieties were covalently linked with the polymer backbone but were not present as the counter ions, and this is the first NMR proof confirming that tertiary amine initiates the ring-opening reaction of epoxides. In sharp contrast, a reaction at huge excesses of EtOH and TEA was carried out at [GL]0/[EtOH]0/[TEA]0 = 1/50/50, and a model compound with only one GL unit was obtained. The NMR analysis of this model compound confirms that the alkoxy anion from ethanol rather than TEA attacks and opens the epoxy ring of GL. The presence and absence of the tertiary amine moiety in the polymers from GL/tertiary amine before and after dialysis further support the reaction mechanism that an alkoxy anion initiates the polymerization, and the positively charged tertiary amine units are present only as counter ions and are removed by dialysis. These demonstrate that the ring-opening mechanisms catalyzed by tertiary amine for epoxides will be different from each other depending on their structures.
研究领域:
有机化学
·
高分子化学
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DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2017
·
IF 2.895
Shurui Xu,Shuanshi Fan,Yanhong Wang,Xuemei Lang
Kinetic hydrate inhibitors (KHIs) combined with thermodynamic inhibitors (THIs) such as monoethylene glycol (MEG) have been good additives for the prevention of hydrate blockages in oil and gas industry operations. The regeneration and recycling of MEG are conventional process steps used to reduce costs. However, the recovery of THIs in the presence of KHIs or the recovery of the KHIs alone has rarely been investigated. In this paper, a series of experiments was designed to study the recovery of both a KHI based poly (N-vinylcaprolactam) and MEG. The results showed that the MEG recovery rate was closely related to the recovery temperature, but was not influenced by the KHI. The MEG recovery rate from solutions consisting of MEG and the KHI was as high as 94.52%, and the KHI was recovered along with the MEG. The polymer structure of the KHI was rarely changed when the recovery temperature was close to its polymerization temperature. The presence of the KHI had a negative impact on the thermodynamic inhibition efficiency of the MEG. The KHI performance of the recovered solution obtained at the KHI polymerization temperature could reach the level of the fresh combination inhibitor, but the recovered solutions obtained at temperatures far above the KHI polymerization temperature demonstrated worse inhibitory performance. The kinetic performance could be restored by adding 5.0 wt% fresh MEG. MEG enabled a subcooling temperature decrease into the range in which KHI which could play its role effectively, leading to the improved kinetic performance of the recovered solution.
研究领域:
化学工程
·
石油工程
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产品关联
DOI
高影响因子
LIQUID CRYSTALS
·
2019
·
IF 3.078
Chunxin Li,Mei Chen,Wenbo Shen,Gang Chen,Lanying Zhang,Huai Yang
In this paper, polymer dispersed liquid crystal (PDLC) films based on epoxy-mercaptan system were prepared by thermal-initiated polymerization. The effects of the liquid crystal (LC) content, the proportion and the functionality of epoxy monomers on the polymer structures and electro-optical properties of the as-made PDLC films were investigated systematically. It was found that the morphologies of the polymer matrix can be altered from polymer meshes to polymer balls by increasing the LC content as well as the functionality of epoxy monomers. Accordingly, the electro-optical properties could be regulated by the morphologies of polymer networks. Especially, the as-made PDLC films with homogeneous porous structures exhibited the optimal electro-optical properties. Consequently, this work offers a meaningful approach to control the microstructures and optimize the electro-optical properties of PDLC films, which indeed can form a wonderful footstone for the wide application of PDLC.
研究领域:
材料科学
·
光学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·Vol. 43
·期 16
·14176-14182
·
IF 2.986
Lin Wang,Benxue Liu,Luyi Zhu,Yongshuai Xie,Yadong Lv,Chonghe Xu,Xiaotong Jin,Xinqiang Wang,Guanghui Zhang,Dong Xu
Polyaceticzirconium (PEZ) sol, which is the precursor of zirconia (ZrO 2 ) continuous fibers, has been synthesized by means of the reaction between zirconium oxychloride octahydrate (ZrOCl 2 ·8H 2 O) and potassium acetate (CH 3 COOK) in methanol. The polymeric structures and the rheological behaviors of the sols with different molar ratios of ZrOCl 2 ·8H 2 O/CH 3 COOK are different and would affect the spinnability and stability significantly. Herein, the polymeric structures and rheological behaviors of the PEZ sols with the molar ratios of 1:1, 1:1.5, 1:1.8 and 1:2 were investigated by Fourier transform infrared (FT-IR), 1 H nuclear magnetic resonance spectrum ( 1 H-NMR), thermogravimetry and differential thermal analysis (TG/DTA) and rheological measurements. The results showed the carboxyl group acted as a chelating ligand instead of bidentate ligand, and the water molecule coordinated to Zr 4+ was deprotoned gradually with the decrease of the molecular ratios. The different polymeric structures lead to a different rheological behaviors of the sols. It is divided into three types, the Newton fluid with a low viscosity produced by the charged linear polymeric structures, the shear thinning fluid with a high viscosity produced by the three-dimensional polymeric structures and the shear thinning fluids with a proper viscosity produced by the linear twining polymeric structures. Through the experimental guidance, we successfully synthesized a sol with suitable viscosity and stability, and used it to fabricate high quality ZrO 2 fibers.
研究领域:
材料科学
·
无机化学
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高分子化学
·
纤维工程
·
溶胶-凝胶技术
✓ 已验证
DOI
高影响因子
ACS Energy Letters
·
2024
·
IF 19.3
Benzheng Lyu,Hong Lin,Dongyu Li,Aleksandr Sergeev,Qiang Wang,Zhengyan Jiang,Lijun Huo,Haibin Su,Kam Sing Wong,Yufeng Wang,Wallace C. H. Choy
Mixed-halide perovskite nanocrystals (PeNCs) featuring bandgap-tunable luminescence with narrow bandwidth have emerged as promising electroluminescent materials for light-emitting diodes (LEDs) to satisfy the color standard of Rec. 2100. However, the phase segregation of mixed-halide perovskites severely restricts the spectral stability and lifetime of perovskite LEDs (PeLEDs). Here, we report that the introduction of multifunctional side-chain-promoted polymer architectures in the synthesis of I/Br-mixed PeNCs to suppress halide segregation and enable electroluminescent stability of the PeLEDs up to ∼2500 min, which is the longest to our knowledge. Meanwhile, the PeLEDs exhibit the pure-red electroluminescence spectrum with Commission Internationale de l’Eclairage coordinates (0.705, 0.292) at one of the highest external quantum efficiencies reported to date, 23.6%. Fundamentally, the as-proposed polymer ligand architecture simultaneously offers long-term nanocrystal dispersion, good charge transport, defect elimination, and phase segregation suppression. Overall, the work demonstrates the potential of the multifunctionalized polymer ligands for developing high-performance PeLEDs toward practical applications.
研究领域:
材料科学
·
光电技术
·
纳米技术
·
化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）