REACTIVE & FUNCTIONAL POLYMERS
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2024
·
IF 4.5
Yuan Jin,Dan Zhao,Jiaqi Wang,Yifan Li,Meisheng Li,Xiuyang Zou,Shouyong Zhou,Yijiang Zhao,Qi Zhang,Dawei Yang
Poor alkali resistance and low ionic conductivity are the crux of the matter that hinder the commercialization applications of anion exchange membranes (AEMs). Here, we designed and synthesized a range of poly(phenylene oxide) (PPO)-based AEMs with benzyl free side-chain type. After that, the influences of different cationic functional groups, such as quaternary ammonium, imidazole and piperidine, on the membrane performances were examined systemically. The introduction of ether bond-containing side chains to build micro-phase separation structures enhanced the conductivity of AEMs (64 mS·cm −1 at 80 °C). At the same time, the side-chain without benzyl structures effectively avoids the influence of electron withdrawing groups on PPO main chains. Moreover, the steric hindrance effect of the benzene ring can further alleviate the attack of OH − , thereby improving the alkali resistance of the membrane. Molecular dynamics simulations revealed that a well-developed hydrogen bonding network was formed between ether linkages and water molecules in the side-chain structures, which enhanced the electrical conductivity of the membrane. Meanwhile, the prepared membranes owned a good water uptake and a certain dimensional stability. These results provide a basis for the subsequent enhancement of membrane performances.
研究领域:
材料科学
·
燃料电池技术
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高影响因子
Materials Today Communications
·
2022
·
IF 3.662
Chao Zheng,Xiaoyan Yu,Xiaoyi Chen,Mingming Chang
Poly(ethylene oxide)- b -poly(propylene oxide)- b -poly(ethylene oxide) (PEO-PPO-PEO) and acrylamide are both commercially available and widely used water-soluble substances. There are many situations that PEO-PPO-PEO coexist with acrylamide in industry applications, while little is known about the influence of acrylamide on cloud point of PEO-PPO-PEO aqueous solution. In this work, it reveals a universal solubilization of PEO-PPO-PEO by acrylamide. There is always an increase in cloud point with addition of acrylamide no matter what the molecular structure and concentration of PEO-PPO-PEO is. It is found the solubilization is more pronounced when PEO-PPO-PEO is with lower molecular weight or lower weight fraction of PPO segments. On the other hand, the cloud point of systems at lower concentration is more sensitive to addition of acrylamide. On the contrary, polyacrylamide exhibits an opposite impact on cloud point of PEO-PPO-PEO. Acrylamide/PEO-PPO-PEO solution changes from clear to cloudy after polymerization of acrylamide.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2026
·
IF 3.1
Yizhou Xu,Zhichao Zhang,Ziqing Gong,Shengfei Hu
This article reports the preparation of a multi-layer core-shell flame retardant (APP@SiO 2 @MA) using melamine (MA), ethyl silicate (TEOS), and γ-(2,3-epoxypropoxy) propyltrimethoxysilane (KH-560) as raw materials, coated with ammonium polyphosphate (APP). Apply the flame retardant to PPO/PS composite materials to improve their flame retardant properties and investigate its effect on the foaming performance of PPO/PS composite materials. This article confirms the successful microencapsulation of APP by SiO 2 and MA through energy dispersive spectroscopy (EDS) analysis, X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM) observation. The combustion performance of P samples and their foam samples was evaluated through thermogravimetric analysis (TG), limit oxygen index (LOI), and UL-94 vertical combustion test, the residual carbon quality significantly increased from 17% of PPO/PS to 38%, and the maximum oxygen index increased from 22.9% to 30.5%. At 165°C and 3.5 MPa foaming conditions, the foaming ratio increased from 1.18 to 4.56 times, and the maximum oxygen index after foaming was 27.9%. This study provides a green and convenient method for the preparation of flame-retardant PPO/PS bead foam materials, expanding the practical application of PPO/PS in industry.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2026
·
IF 3.9
Ya-Han Shi,Yi-Ying Lin,Yong Liu,Xu Han,Song-Hai Wu
The trade-off between ionic conductivity and stability remains a major challenge in developing high-performance anion exchange membranes (AEMs). Herein, PPO-based AEMs with an appropriate degree of DABCO-C6 cross-linking and flexible multi-cation DTH side chains, denoted as PPO/DABCO-C6/DTH-y (y = 20–50), were prepared to construct continuous ion-conducting pathways. PPO/DABCO-C6/DTH-40 not only exhibits a high OH– conductivity of 95.75 mS cm–1 at 80 °C and retains 79.79% in 1.0 M NaOH at 80 °C for 600 h but also maintains a low swelling (9.82% at 80 °C) and high tensile strength (37.68 MPa). Raman analysis indicates that OH– transport is primarily governed by the Grotthuss mechanism, enhanced by high alkalinity. In water electrolysis, the PPO/DABCO-C6/DTH-40 achieves 390 mA cm–2 at 1.9 V (50 °C) and remains stable at 420 mA cm–2 (12 h). This study provides a new structural design for PPO-based AEMs, balancing high ionic conductivity with dimensional and chemical stability for practical water electrolysis.
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高影响因子
MACROMOLECULAR RESEARCH
·
2021
·Vol. 29
·期 3
·199-210
·
IF 2.227
Wu Zhihui,Shen Chunhui,Gao Shanjun,Zhu Xi,Zhang Mingliang,Ding Ao
A series of proton exchange membranes were prepared by incorporating phosphonic functionalized siloxane into sulfonic poly(2,6-dimethyl-1,4-phenyleneoxide) (SPPO) and imidazole functionalized poly(2,6-dimethyl-1,4-phenyleneoxide) grafted with siloxane (IPPO-Si). Phosphonic acid functionalized siloxane was synthesized from amino trimethyl phosphonic acid (ATMP) and (3-aminopropyl)triethoxysilane (APTES). FTIR results showed that 1-methylimidazole and APTES were successfully grafted onto polyphenylene oxide, and APTES successfully formed Si-O-Si crosslinked networks through hydrolytic crosslinking. The membranes were thermally stable up to 220 °C and exhibited excellent oxidative stability and mechanical performance. We also measured the proton conductivity of the membranes. The results showed that the proton conductivities of the composite membranes increased with the increasing of SPPO content at different degrees under high (100 °C–160 °C) and low (25 °C–80 °C) temperature conditions. Furthermore, the IPPO-SI-P/SPPO-30 has the best conductivity, reaching to 0.1131 S cm −1 at 80 °C, 100%RH and 0.1049 S cm −1 at 160 °C, 5%RH, respectively. Therefore, this novel membrane acts as a potential candidate for proton exchange membranes with a wider applicable temperature (25 °C–160 °C).
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高影响因子
POLYMER COMPOSITES
·
2026
·
IF 4.9
Qian Zhang,Huihuang Ma,Luo Luo,Chunhua Zhou,Qunfang Lin,Xiaodong Zhou
Basalt fiber (BF)–reinforced polyphenylene oxide (PPO) composites are promising for high-performance wave-transparent applications but are limited by intrinsically weak interfacial adhesion. To address this challenge, we developed a waterborne, self-emulsified amphiphilic sizing agent inspired by reversible addition–fragmentation chain transfer (RAFT) polymerization, polymerization-induced self-assembly (PISA), and the “like-dissolves-like” principle. A styrene–maleic anhydride copolymer was grafted with triethanolamine to form an amphiphilic precursor that acted as a reactive emulsifier for styrene emulsion polymerization, ultimately yielding a self-stabilized amphiphilic nanoemulsion. This sizing layer establishes a molecular bridge at the BF/PPO interface: hydrophilic PSMA-g-TEA segments covalently bond with surface Si OH groups to generate stable Si O C linkages, while hydrophobic polystyrene segments entangle with the PPO matrix. As a result, the tensile strength of BF monofilaments increased from 1.243 GPa (untreated) to 1.506 GPa, and the interfacial shear strength (IFSS) of the composites improved from 10.32 to 28.22 MPa. Requiring no additional emulsifiers or organic solvents, this environmentally benign and scalable strategy effectively overcomes interfacial incompatibility, providing an efficient route to high-strength, low-loss BF/PPO composites for advanced wave-transparent structural applications. Highlights Waterborne self-emulsified amphiphilic sizing for BF/PPO composites. RAFT–PISA strategy yields reactive nanoemulsion without extra surfactants. Molecular bridge forms via Si O C bonds and PPO chain entanglement. 2.0 wt% sizing boosts monofilament strength by 21.2% and IFSS by 173%. Stable, green, and scalable route for high-performance wave-transparent composites.
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DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Ya-Qi Wang,Qing He,Zhi-Yang Zhang,Lei Zhang,Na-Juan Yuan,Yong Liu,Hai-Tao Ren,Xu Han
Although the low molecular weight poly(2,6-dimethyl-1,4-phenyl oxide) (LMW-PPO) has been extensively applied in the field of 5G communication, the complicated procedures involved in the synthesis of LMW-PPO and efficient recovery of the homogeneous catalysts are still challenging nowadays. In this study, five ionic liquids (ILs) have been successfully synthesized, and LWM-PPO is directly synthesized using different Cu(OAc) 2 -ILs complexes as catalysts. Among them, Cu(OAc) 2 - IL(a) not only exhibits the high yield of LWM-PPO (83.68%, M n =3.6✕10 3 ) with the low 3,3’,5,5’-tetramethyl-4,4’-diphenoquinone (DPQ) yield (0.12%) and polydispersity index (PDI, 1.39) in methanol, but also maintains high stability after being recycled for 5 times. In addition, with increasing H 2 O contents in the system from 1.0% to 5.0%, the M n values of PPO decrease from 2.9✕10 3 to 2.4✕10 3 with the narrow PDI values in the range of 1.22-1.45, indicating that trace H 2 O effectively promotes the formation of binuclear Cu(II) complex between Cu(OAc) 2 ·H 2 O and ILs, which then polymerizes 2,6-dimethylphenol (DMP) to LMW-PPO. The synthesized LMW-PPO exhibits high thermostability ( T d5% =427.07-430.52°C), low glass transition temperature ( T g =167.6-180.3°C), and low dielectric constant ( D k =2.14-2.64, 1 GHz) and dielectric loss ( D f =2.83✕10 -3 -4.91✕10 -3 , 1 GHZ), indicating that it is more appropriate to be used in the field of 5G communication. This study provides new insight on the importance of ILs in direct synthesis of LMW-PPO with high performances.
研究领域:
材料科学
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化学工程
·
高分子化学
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高影响因子
Polymer-Plastics Technology and Materials
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2020
·
IF 0
Shanshan Wang,Qifeng Li,Fanghui Wang
Designed and synthesized a series of imidazolium-functionalized Poly (2, 6-dimethyl-1, 4-phenylene oxide) (Im-PPO) containing pendant imidazole groups, which were used to supply functional sites for acid–base interaction with the doping phosphoric acid. The imidazolium-functionalized Poly (2, 6-dimethyl-1, 4-phenylene oxide) membranes obtained by the solution-casting method were doped with phosphoric acid (PA). The PA content, swelling, and tensile strength of the different membranes doped with PA were measured. With the increase of the length of side chains on the imidazole groups, the membrane showed different properties. The proton conductivity at a level of 3.7 × 10−2 S/cm was achieved at 160°C by the MeIm-PPO imidazolium composite membrane.
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FOOD CHEMISTRY
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2016
·
IF 4.052
Zhiqiang Xiong,Wei Liu,Lei Zhou,Liqiang Zou,Jun Chen
It has been revealed that some polyphenols can prevent enzymatic browning caused by polyphenoloxidase (PPO). Apigenin, widely distributed in many fruits and vegetables, is an important bioactive flavonoid compound. In this study, apigenin exhibited a strong inhibitory activity against PPO, and some reagents had synergistic effect with apigenin on inhibiting PPO. Apigenin inhibited PPO activity reversibly in a mixed-type manner. The fact that inactivation rate constant ( k ) of PPO increased while activation energy ( E a ) and thermodynamic parameters (Δ G , Δ H and Δ S ) decreased indicated that the thermosensitivity and stability of PPO decreased. The conformational changes of PPO were revealed by fluorescence emission spectra and circular dichroism. Atomic force microscopy observation suggested that the dimension of PPO molecules was larger after interacting with apigenin. Moreover, computational docking simulation indicated that apigenin bound to PPO and inserted into the hydrophobic cavity of PPO to interact with some amino acid residues.
研究领域:
生物化学
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食品科学
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分子生物学
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酶学
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DOI
PubMed
高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
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2024
·
IF 3.7
Shu-Ping Zou,Wei Ding,Yu-Yue Han,Kun Niu,Ya-Ping Xue,Yu-Guo Zheng
L-Phosphinothricin (L-PPT) is the active compound of a broad-spectrum herbicide. In this study, we biosynthesized L-PPT via the asymmetric reduction of 2-carboxy-4-(hydroxymethylphosphoryl) butyric acid (PPO) using a whole-cell biocatalyst. Glutamate dehydrogenase from Pseudomonas moorei ( Pm GluDH), Glucose dehydrogenase from Exiguobacterium sibiricum ( Es GDH) and NAD kinase from Corynebacterium glutamicum ( Cg NADK) were coexpressed in E. coli , significantly increasing the catalytic efficiency by regenerating more NADPH to promote PPO reduction. Following the optimization of balancing the co-expression of the three enzymes in pETDuet-1 and pCDFDuet-1, the coexpressing strain increases in the intracellular NADP(H) concentration to 54.9 μmol/g DCW, which was 3.8-fold higher than the control. The co-expression system exhibited optimal activity at a temperature of 35°C, pH 7.5, and the glucose to PPO molar ratio of 1.4:1. In a 30 L bioconversion system the final concentration and productivity of L-PPT reached 79.8 g/L (>99% ee ) and 1440 g/(L·d), respectively. These results will contribute to the industrial biological production of L-PPT.
研究领域:
生物技术
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生化工程
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代谢工程
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高影响因子
JOURNAL OF FOOD SCIENCE
·
2020
·Vol. 85
·期 4
·1140-1150
·
IF 2.479
Lu Wang,Weili Deng,Peng Wang,Wencheng Huang,Jiamin Wu,Tingyu Zheng,Jiebo Chen
Alterations of aroma properties and aroma-related attributes of sugarcane juice during thermal processing under different temperatures (90, 100, and 110 ℃) and treating time (10 s, 20 s, and 30 s) were assessed in this study. Changes in the volatility of aroma compounds were extremely complicated and respected to thermal processing conditions. Fructose, serine, and glutanic acid of sugarcane juice were increased at first and decreased at the end of treatment at high temperature. Phenolic compounds and PPO activity presented the decrease trends throughout the thermal treatment. The thermal processing of sugarcane juice could be roughly divided into three stages based on the cluster analysis of all the data in this study. Sugars, amino acids, and phenolic compounds might be important potential precursors of aroma deteriorating reactions. The comprehensive analysis of aroma relevant compounds and enzyme activities was beneficial for the investigation of degradation mechanism of aroma for sugarcane juice, and providing a theoretical basis for optimization of juice processing. Practical Application This study demonstrated the changing process of aroma quality and associated compounds in sugarcane juice during thermal processing. This could help to find out the reasons of aroma degradations in sugarcane juice and other thermal sensitive juice. Our manuscript created a paradigm for future studies on the aroma quality control and parameter optimization during the processing of fruit and vegetable juice.
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PubMed
高影响因子
Journal of Future Foods
·
2026
·
IF 10.6
Jinjie Hua,Liyue Yang,Jianqiang Ma,Xiwang Li,Ting An,Fenglan Zhang,Ming Chen,Xinxin Lv,Jiayi Zhu,Jinjin Wang,Haibo Yuan,Yongwen Jiang
Tea varieties are key factors influencing tea type and flavor quality. However, the key biochemical indicators biochemical indicators associated with tea varietal suitability remain unclear, and the traditional phenol-ammonia ratio is insufficient as an evaluation criterion. Therefore, identifying reliable biochemical markers for evaluating tea varietal suitability is important for optimizing tea processing and product quality. We aimed to identify key biochemical indicators associated with tea varietal suitability for black and green tea processing and to establish a predictive model for evaluating tea varietal adaptability. Molecular biology and targeted metabolomics approaches were used to analyze polyphenol oxidase (PPO) activity, the expression of three PPO isozymes, and the contents of 60 non-volatile metabolites (NVMs) in fresh leaves from 20 representative tea varieties. Variable importance in projection, S-plot, taste active value, and classification analyses were applied to identify key differential indicators. A predictive model for tea varietal suitability was subsequently developed using data preprocessing and regression analysis. Nine key differential biochemical indicators, including epigallocatechin gallate, epicatechin gallate, epigallocatechin, epicatechin, catechin, myricetin-3-O-galactoside, theaflavin-3-3′-di-O-gallate, theanine, and glutamic acid, together with three enzyme-related indicators, namely PPO activity and the expression levels of PPO2 and PPO4, were identified. Tea varieties suitable for black tea exhibited high levels of epigallocatechin gallate, epicatechin gallate, theaflavin-3-3′-di-O-gallate, and PPO activity, particularly PPO4 expression. In contrast, tea varieties suitable for green tea showed high levels of epigallocatechin, epicatechin, theanine, glutamic acid, and myricetin-3-O-galactoside content. A 1DER+MINMAX data preprocessing method and predictive model effectively evaluated tea varietal suitability. This study identified key biochemical indicators associated with tea varietal suitability and established a predictive model for evaluating tea adaptability for black and green tea processing. These findings provide theoretical and technical support for the efficient utilization of fresh leaf leaves and tea product development.
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高影响因子
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