INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2022
·Vol. 46
·期 15
·24395-24407
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IF 4.672
Kaiyue Cao,Jinwu Peng,Cengliang Shan,Zhenchao Liu,Minhui Liang,Le Wang,Wei Hu,Baijun Liu
Summary A series of cross-linked blend membranes based on a linear poly(2,6-dimethyl phenylene oxide) (PPO) and a hyperbranched poly(4-vinylbenzyl chloride) (HVBC) are prepared via a simple solution casting procedure, followed by a cross-linking treatment. The experiment indicates that the “HVBC enhancing PPO” membranes can have a looser cross-linked “linear-hyperbranched” blend structure, which is expected to improve the water absorption and dimensional stability. As a result, the excellent overall properties including high anion conductivity, low swelling, high strength, and excellent oxidative-alkaline stability can be achieved simultaneously. A maximum conductivity of PPO-HVBC-100 (ion exchange capacity [IEC] ~ 1.88 mmol/g) is up to 135.9 mS/cm at 80°C, which is 2.9 times higher than that of pristine PPO membrane (IEC ~ 1.62 mmol/g). All the results reveal that the hyperbranched HVBC with a unique multi-cation structure is a preferred “performance-enhancing component” for the PPO-based membranes, and this study also provides a novel idea for the preparation of high-performance AEMs.
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
Polymers
·
2023
·Vol. 15
·期 2
·449
·
IF 5
Jingyuan Hu,Liyue Zhang,Mingxuan Chen,Jinyue Dai,Na Teng,Hongchi Zhao,Xinwu Ba,Xiaoqing Liu
To overcome the high flammability and brittleness of epoxy resins without sacrificing their glass transition temperature (Tg) and mechanical properties, three epoxy-terminated hyperbranched flame retardants (EHBFRs) with a rigid central core and different branches, named EHBFR-HB, EHBFR-HCM, and EHBFR-HBM, were synthesized. After chemical structure characterization, the synthesized EHBFRs were introduced into the diglycidyl ether of bisphenol A (DGEBA) and cured with 4, 4-diaminodiphenylmethane (DDM). The compatibility, thermal stability, mechanical properties, and flame retardancy of the resultant resins were evaluated. Results showed that all three EHBFRs could significantly improve the fire safety of cured resins, and 30 wt. % of EHBFRs (less than 1.0 wt. % phosphorus content) endowed cured DGEBA with a UL-94 V-0 rating. In addition, the increased rigidity of branches in EHBFRs could increase the flexural strength and modulus of cured resins, and the branches with appropriate rigidity were also beneficial for improving their room temperature impact strength andTg.Keywords:hyperbranched flame retardant;toughness;bio-based;epoxy resin
研究领域:
材料科学
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化学工程
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DOI
PubMed
高影响因子
POLYMER INTERNATIONAL
·
2012
·Vol. 62
·期 10
·1457-1464
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IF 1.902
Youmei Bao,Jing He,Yuesheng Li
Hyperbranched polyesters with thioether linkages were facilely prepared from methyl 10-undecenoate, a castor oil-derived renewable chemical. The monomer was obtained in excellent yield through thiol–ene click chemistry in the presence of catalytic amounts of photoinitiator under UV irradiation. Subsequent bulk polycondensation via a transesterification process catalyzed by Ti(OBu) 4 , Sb 2 O 3 or Zn(OAc) 2 gave hyperbranched polyesters with high molecular weights and unusual crystalline properties. The degree of branching in the range 0.45 − 0.54 calculated from quantitative 13 C NMR spectroscopy and low inherent viscosities of 0.16 − 0.25 dL g −1 strongly confirmed the hyperbranched structures of the resultant polymers. © 2012 Society of Chemical Industry
研究领域:
材料化学
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可再生资源化学
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DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 19
·6787
·
IF 4.6
Yuan Zhao,Qianlong Fan,Yinhua Liu,Shuwen Wang,Xudong Guo,Liujia Guo,Mengcheng Zhu,Xuan Wang
In order to separate the colloidal in high-turbidity water, a kind of magnetic composite (Fe3O4/HBPN) was prepared via the functional assembly of Fe3O4and an amino-terminal hyperbranched polymer (HBPN). The physical and chemical characteristics of Fe3O4@HBPN were investigated by different means. The Fourier Transform infrared spectroscopy (FTIR) spectra showed that the characteristic absorption peaks positioned at 1110 cm−1, 1468 cm−1, 1570 cm−1and 1641 cm−1were ascribed to C–N, H–N–C, N–H and C=O bonds, respectively. The shape and size of Fe3O4/HBPN showed a different and uneven distribution; the particles clumped together and were coated with an oil-like film. Energy-dispersive spectroscopy (EDS) displayed that the main elements of Fe3O4/HBPN were C, N, O, and Fe. The superparamagnetic properties and good magnetic response were revealed by vibrating sample magnetometer (VSM) analysis. The characteristic diffraction peaks of Fe3O4/HBPN were observed at 2θ = 30.01 (220), 35.70 (311), 43.01 (400), 56.82 (511), and 62.32 (440), which indicated that the intrinsic phase of magnetite remained. The zeta potential measurement indicated that the surface charge of Fe3O4/HBPN was positive in the pH range 4–10. The mass loss of Fe3O4/HBPN in thermogravimetric analysis (TGA) proved thermal decomposition. The –C–NH2or –C–NH perssad of HBPN were linked and loaded with Fe3O4particles by the N–O bonds. When the Fe3O4/HBPN dosage was 2.5 mg/L, pH = 4–5, the kaolin concentration of 1.0 g/L and the magnetic field of 3800 G were the preferred reaction conditions. In addition, a removal efficiency of at least 86% was reached for the actual water treatment. Fe3O4/HBPN was recycled after the first application and reused five times. The recycling efficiency and removal efficiency both showed no significant difference five times (p> 0.05), and the values were between 84.8% and 86.9%.Keywords:hyperbranched polymer;Fe3O4;coating;magnetic separation;water treatment
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
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2016
·Vol. 6
·期 95
·92943-92952
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IF 3.289
Henghui Huang,Qi Yao,Hualin Chen,Bailing Liu
In order to improve the scale inhibition efficiency of existing scale inhibitors for industrial water and to reduce the phosphorus pollution of water bodies, a new type of scale inhibitor with a hyper-branched structure has been developed in this study. First, an AB′ type of functional monomer (AMA) was synthesized from maleic anhydride (MAH) and propylene glycol, then copolymerized with monomer B (MAH) through radical polymerization, resulting in a hyper-branched polycarboxylic acid. The synthesis conditions, such as reaction temperature and time, monomer ratio and initiator dosage, have been investigated for obtaining the expected hyper-branched polymer with good scale inhibition performance. The scale inhibition efficiency of the obtained products was determined according to their resistance to the crystallization of calcium sulfate and calcium carbonate under the optimal application conditions. The experimental results show that the hyper-branched polycarboxylic acid provides a scale inhibiting efficiency for CaCO3 and CaSO4 as high as 95.2% and 92.3%, respectively. In addition, XRD analysis showed that the good scale inhibition of the hyper-branched polycarboxylic acid is attributed to its ability to inhibit and destroy the formation of crystals, changing the crystal forms of the calcium scale. This conclusion indicates that the prepared hyper-branched polycarboxylic acid has great application potential in the treatment of industrial water.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Guozhang Gu,Huaiyang Cai,Yutao Wang,Chen Tang,Guoxiang Zou,Jinchun Li,Rong Yang
Achieving both super toughness and flame retardancy in polylactic acid (PLA) materials hinges on resolving the interface compatibility issues between flame retardants, toughening agents, and PLA, as well as overcoming potential antagonisms between these components. Here, we present an approach employing hyperbranched structures to simultaneously enhance the toughness and flame retardancy of PLA materials. Our strategy involved the reactive blending of PLA with a quaternary bio-based phosphorus-containing copolyester (PPE) featuring side hydroxyl groups and hexamethylene glycidyl cyclotriphosphazene (HGCP). The multi-epoxy groups of HGCP reacted with the hydroxyl and carboxyl groups present in PPE and PLA, resulting in the formation of hyperbranched PLA-PPE copolymers. The hyperbranched copolymers provided great interfacial compatibilization and low viscosity, synergistically promoting the melt-dripping flame-retardant mechanism facilitated by PPE, aiding in the rapid removal of heat and combustible material from the pyrolysis zone. Consequently, the PLA/PPE/HGCP blends exhibited super toughness, achieving a maximum notched impact strength of 70.2 kJ/m 2 . Additionally, the blends demonstrated a 27 % LOI and can pass the UL-94 V-0 rating. Moreover, all the blends are biodegradable in a Proteinase K solution. This research underscores the efficacy of utilizing hyperbranched structures as a promising strategy for the development of PLA materials with simultaneous enhancement of processability, toughness, and flame retardancy.
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
高影响因子
Sustainability
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2020
·Vol. 12
·期 19
·7931
·
IF 2.576
Sanmei Li,Mingda Wu,Linghong Lu,Jiabao Zhu
Humin is the waste residue from the process of preparing humic acid, which accounts for a large proportion of the raw material (weathered coal humic acid). Its Cd(II) adsorption performance is far inferior to that of humic acid. How to regenerate humin is of great significance to the low-cost treatment of Cd(II) pollution in wastewater. In this study, humin was modified by hyperbranched polyethyleneimine to enhance the adsorption capacity for Cd(II). Fourier transform infrared spectroscopy and the X-ray photoelectron spectrometer showed that hyperbranched polyethyleneimine was grafted to the surface of humin. Flame atomic absorption spectroscopy showed that the saturated Cd(II) adsorption capacity of the modified humin was increased to 11.975 mg/g, which is about 5 times than that of humin and is also higher than that of humic acid. The adsorption kinetics, adsorption isotherm, and thermodynamic properties of humic acid, humin, and modified humin were also studied. This study may provide a foundation for research utilizing natural resources to reduce heavy metal pollution in the environment.Keywords:humin;hyperbranched polyethyleneimine;modification;adsorption;Cd(II)
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Polymers
·
2020
·Vol. 12
·期 11
·2592
·
IF 3.426
Mingcong Hao,Tongtong Wu,Qunzhi Chen,Xueyan Lian,Haigang Wu,Bingyang Shi
Owing to the wide spectrum of excitation wavelengths of up-conversion nanoparticles (UCNPs) by precisely regulating the percentage of doping elements, UCNPs have been emerging as bioimaging agents. The key drawback of UCNPs is their poor dispersibility in aqueous solution and it is hard to introduce the chemical versatility of function groups. In our study, we present a robust and feasible UCNP modification approach by introducing hyperbranched polyglycerols (hbPGs) as a coating layer. When grafted by hbPGs, the solubility and biocompatibility of UCNPs are significantly improved. Moreover, we also systematically investigated and optimized the chemical modification approach of amino acids or green fluorescence protein (GFP), respectively, grafting onto hbPGs and hbPGs-g-UCNP by oxidizing the vicinal diol to be an aldehyde group, which reacts more feasibly with amino-containing functional molecules. Then, we investigated the drug-encapsulating properties of hbPGs-Arg with DOX and cell imaging of GFP-grafted hbPGs-g-UCNP, respectively. The excellent cell imaging in tumor cells indicated that hbPG-modification of UCNPs displayed potential for applications in drug delivery and disease diagnosis.Keywords:hyperbranched polyglycerols;up-conversion nanoparticle;bioimaging
研究领域:
材料科学
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生物医学工程
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纳米医学
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产品关联
DOI
PubMed
高影响因子
Polymers
·
2018
·Vol. 10
·期 9
·1024
·
IF 2.935
Qiyun Luo,Yuqi Li,Li Ren,Xu Xu,Shaorong Lu
Well-defined functionalized sisal cellulose fibers (SCFs) grafted on hyperbranched liquid crystals (HLP) were synthesized to improve the compatibility between SCFs and epoxy resin (EP). The influence of SCFs-HLP on the mechanical and thermal properties of SCFs-HLP/EP composites was studied. The results show that the mechanical properties of SCFs-HLP/EP composites were enhanced distinctly. Particularly, compared with EP, impact strength, tensile strength, and flexural strength of composites with 4.0 wt % SCFs-HLP were 38.3 KJ·m−2, 86.2 MPa, and 150.7 MPa, increasing by 118.7%, 55.6%, and 89.6%, respectively. As well, the glass transition temperature of the composite material increased by 25 °C. It is hope that this work will inform ongoing efforts to exploit more efficient methods to overcome the poor natural fiber/polymer adhesion in the interface region.Keywords:sisal cellulose fibers;epoxy resin;composites;liquid crystals;hyperbranched
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
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2019
·
IF 3.375
Zhiwei Wang,Xuan Yuan,Guoxing Yang,Weidong Zhang,Lijia Liu,Hongxing Dong,Chunhong Zhang,Jianwei Bai,Linghui Meng
A novel hyperbranched polymeric quaternary ammonium salt (HPQAS) with benzene rings in the structure (PVBC-TMA) was synthesized by self-condensing vinyl polymerization followed with quaternary amination reaction. Meanwhile, a hyperbranched polyamidoamine (PAMAM) was separately neutralized with different acids to produce the HPQASs without benzene rings. These HPQASs were dissolved in DMSO and used to extract benzene from its mixture with cyclohexane. The liquid–liquid equilibrium (LLE) data indicate that the HPQAS/DMSO mixture showed a higher selectivity coefficient (19.92) than DMSO (<15). PVBC-TMA having benzene rings showed higher extraction performance than the PAMAM salts without benzene rings, especially when the composition of benzene/cyclohexane is close to the azeotrope state. The cation−π and π–π interactions between the ammonium ion and the benzene ring in the HPQAS with benzene in the benzene/cyclohexane mixture were thought to be the mass transfer impetus for extracting benzene from its mixture with cyclohexane by utilizing the HPQASs. This was the first example of applying the hyperbranched polymeric ammonium in the separation of benzene/cyclohexane.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2016
·
IF 5.557
Xin Kong,Yin Zhang,Si-Yi Zeng,Bao-Ku Zhu,Li-Ping Zhu,Li-Feng Fang,Hideto Matsuyama
To prepare thin film composite (TFC) nanofiltration (NF) membranes with improved flux and rejection performance at low pressure, hyperbranched polyester (HPE) was selected as the nano-sized macromonomer and successfully incorporated into the skin layers on PVC hollow fiber substrates via interfacial polymerization between trimesoyl chloride and the mixtures of hydroxyl-terminated HPE/piperazine (PIP). The resultant NF membranes were characterized using ATR-FTIR, FESEM , AFM and surface zeta potential , while their performance was evaluated in terms of permeate flux and rejection rates of different inorganic salts and neutral solutes. When the HPE content was lower than 60 wt% in HPE/PIP mixtures, the increased membrane surface roughness and the HPE embedded in skin layer effectively enhanced the permeate flux without sacrificing salt rejection for the prepared TFC NF membranes. Further increasing HPE content in HPE/PIP mixtures yielded looser polyamide skin layer, which led to the decline of solute rejection. Due to the larger size and good interfacial compatibility with cross-linked polyamide matrix, the incorporated HPE could exist stably in the skin layer. And thus, the prepared TFC NF membranes showed good flux and rejection stability in a long-term filtration process.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
MOLECULES
·
2020
·Vol. 25
·期 3
·687
·
IF 3.267
Wan-Xia Wu,Zi Liu
A series of new hyperbranched aliphatic poly(β-thioether ester)s were prepared by the enzymatic ring-opening polycondensation of 1,4-oxathiepan-7-one (OTO) and AB2/ABB’ comonomer with acid-labile β-thiopropionate groups. Two kinds of comonomers, methyl 3-((3-hydroxy-2-(hydroxymethyl)propyl)thio)propanoate (HHTP) and methyl 3-((2,3-dihydroxypropyl)thio)propanoate (DHTP), with different primary alcohols and secondary alcohols, were synthesized by thiol–ene click chemistry and thiol-ene Michael addition, respectively. Immobilized lipase B fromCandida antarctica(CALB), Novozym 435, was used as the catalyst. The random copolymers were characterized by1H-NMR,13C-NMR, GPC, TGA, and DSC. All branched copolyesters had high molecular weights over 15,000 Da with narrow polydispersities in the range of 1.75–2.01 and were amorphous polymers. Their degradation properties under acidic conditions were also studied in vitro. The polymeric nanoparticles of hyperbranched poly(β-thioether ester)s were successfully obtained and showed good oxidation-responsive properties, indicating their potential for biomedical applications.Keywords:Novozym 435;poly(β-thioether ester);hyperbranched;acid degradation;oxidation response
研究领域:
高分子化学
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生物材料
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酶催化
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）