POLYMER COMPOSITES
·
2024
·
IF 4.8
Fangshan Li,Heng Wang,Yuchao Ke,Yuan Hu,Ru Xia
[AMIm]Cl@GNP/SBR composites were prepared by blending ionic liquid 1-allyl-3-methylimidazolium chloride salt([AMIm]Cl) modified graphene nanoplatelets (GNP) and styrene-butadiene rubber (SBR). The mechanical and thermal properties as well as the structure–activity relationship of the obtained composites based on the modified filler were investigated under the synergistic effect of non-covalent and covalent bonding. The experimental results indicated that the modification of GNP by [AMIm]Cl occurred under mild conditions. The dispersibility of [AMIm]Cl@GNP in SBR was enhanced by its participation in vulcanization and the synergistic effect of non-covalent and covalent cross-linking networks such as cation-π, π-π, and hydrogen bonds. This improvement led to an increase in the interfacial bond strength of the composites and a reduction in the interfacial thermal resistance. These effects resulted in both reinforcement and thermal conductivity properties. The tensile strength and elongation at break of [AMIm]Cl@GNP/SBR composites increased from 18.2 to 22.9 MPa and from 737.9% to 923.5%, respectively, when the modification ratio of [AMIm]Cl was 1% and the loading of [AMIm]Cl@GNP was only 4 phr (mass ratio). At the same time, the thermal conductivity in the vertical direction of the composites increased from 0.25 to 0.44 W/(m·K), and the thermal conductivity in the horizontal direction increased from 0.27 to 0.81 W/(m·K). Highlights Modified powder [AMIm]Cl@graphene nanoplatelets were prepared; [AMIm]Cl@graphene nanoplatelet/styrene-butadiene rubber blend was prepared; Mechanical properties of blends significantly improved over blank; The horizontal thermal conductivity of the blends increases obviously; The vertical thermal conductivity of the blends was improved.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Kaicheng Zhang,Ming Yan,Yue Li,Faguang Ma,Yilin Wu
Membrane-based imprinted sites for achieving specific molecule transport and precise recognition have great potential to revolutionize nanofiltration technology . Nonetheless, how to efficiently prepare imprinted membrane structures with accurate identification - ultrafast molecular transport - high stability in mobile phase remains a key issue and serious challenge. Herein, we have developed a dual-activation strategy to constructing nanofluid-functionalized membranes with double imprinted nanoscale channels (NMDINCs), realizing ultrafast transport performance as well as structure&size-exclusion selectivity in allusion to particular compounds. The resultant NMDINCs, founded on principal nanofluid-functionalized construction companied by the boronate affinity sol-gel imprinting systems, illustrated that delicate regulation towards polymerization framework as well as functionalization belonging to distinctive membrane structures was crucial for realizing ultrafast molecules transport combined with prominent molecules selectivity. The synergistic recognition of covalent bonds and non-covalent bonds driven by two functional monomers effectively realized the selective recognition to template molecules, leading to the high selective separation factors of Shikimic acid (SA)/ Para hydroxybenzoic acid（PHA）, SA/ P nitrophenol（PN）and catechol（CL）for 8.9, 8.14 and 7.23, respectively. The dynamic consecutive transport outcomes exhibited that numerous SA-dependent recognition sites could still keep reactivity under pump-driven permeation pressure for appreciable time, forcefully proving the successful construction as to high-efficiency membrane-based selective separation system. It is anticipated that this strategy as to the in situ introduction of nanofluid-functionalized construction into porous membrane would hold great promise in preparing high-intensities membrane-founded discriminating separation systems, which was equipped with prominent consecutive permeability as well as excellent selectivity.
研究领域:
材料科学
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化学工程
·
纳米技术
·
分离技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Jia Liu,Xiaoning Ma,Yanping Tong,Meidong Lang
Ditelluride bonds have been reported as dynamic covalent bonds which could undergo reversible formation and cleavage at room-temperature. In this work, a novel self-healing ditelluride-containing polyurethane was synthesized by incorporating ditelluride bond into its main chain. Base on the dynamic nature of ditelluride bonds, this polyurethane could self-heal in darkness at room temperature without external intervention. The study on the exchange mechanism revealed that the reversible exchange of ditelluride bonds and the intermolecular hydrogen bonding were the two main factors that responsible for the self-healing behavior of this polyurethane. The ditelluride content and chain mobility of the polymer have a significant effect on its self-healing property. The unique non-intervention self-healing properties and wild applicability makes this polymers ideal for environment friendly smart systems.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL SCIENCES
·
2022
·Vol. 134
·期 3
·1-11
·
IF 2.15
LIU XIAOJUAN,LI MINGMING,YANG SHUMING,YANG YAYA,NIE JIANG,XUE YUBING,OUYANG YINGGEN,XIAO SONGTAO
The increasing demand for neodymium (III) and samarium (III) due to their extensive high-tech applications has drawn much attention to their recovery. In this work, the copper-based metal-organic framework HKUST-1 was prepared and used for the adsorption of neodymium (III) and samarium (III) in the media of an aqueous solution. The maximum adsorption capacity of the material for neodymium (III) and samarium (III) was 284.11 and 503.45 mg g −1 at a pH of 5.5, respectively. The adsorption removal rate could achieve nearly 100% at the solid-to-liquid ratio of 1.0 g L −1 , which is relatively excellent among such adsorbents used for rare earth elements uptake. The mechanism and reversibility of neodymium (III) and samarium (III) adsorption were systematically investigated by X-ray diffraction, Fourier transforms infrared spectroscopy, Raman spectra, and X-ray photoelectron spectroscopy, suggesting that the mechanism for the adsorption was ion exchange and complexation between trivalent rare-earth ions and the oxygen atom in the hydroxyl group. The reason behind the material displaying a more robust affinity for samarium (III) may be caused by the energy difference between f n and f n+1 states of samarium (III) was larger than that of neodymium (III), thus forming stronger covalent bonding. Graphical abstract HKUST-1 exhibited high adsorption capacity towards Nd (III) and Sm (III). The reason behind the material displaying a more robust affinity for Sm(III) was caused by that the energy difference between f n and f n+1 states of Sm(III) was larger than that of Nd(III), thus forming stronger covalent bonding.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
Science of Advanced Materials
·
2015
·Vol. 7
·期 6
·1021-1027
·
IF 2.598
Yu Jin-Gang,Chen Na,Jiao Fei-Peng,Liu Qi,Jiang Xin-Yu,Jiang Jian-Hui,Chen Xiao-Qing
A novel and facile method for preparing iodinated carbon nanotubes, with iodine and hydrogen simultaneously covalently bound to the surface of nanotubes, has been developed. The functionalized carbon nanotubes were fully characterized using Fourier transform infrared spectroscopy, X-ray
photoelectron spectroscopy, Raman spectroscopy, energy-dispersive X-ray (EDX) spectroscopy and thermogravimetric analyses. This is the first report on the successful functionalization of single-walled carbon nanotubes using hydroiodic acid.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 27
·1901721
·
IF 15.621
Hang Yang,Chenghai Li,Meng Yang,Yudong Pan,Qianfeng Yin,Jingda Tang,Hang Jerry Qi,Zhigang Suo
Many recently demonstrated devices require the integration of hydrogels and hydrophobic elastomers. Extrusion print is a promising method for rapid prototyping but existing approaches do not fulfill a basic requirement: print integrated structures of a hydrogel and an elastomer, in arbitrary sequence, with strong adhesion. This paper demonstrates an approach to fulfill this requirement. During print, the ink of each material flows through a nozzle under a pressure gradient but retains the shape against gravity and capillarity. During cure, covalent bonds form to link monomer units into polymer chains, crosslink the polymer chains into the polymer networks of the hydrogel and the elastomer, as well as interlink the two polymer networks into an integrated structure. The approach covalently interlinks the hydrogel network and the elastomer network by adding an interlink initiator in one of the inks. An adhesion energy above 5000 J m −2 is demonstrated. Printed morphing structures survive swelling and printed artificial axons survive repeated hits of a hammer. This approach opens a road to the development of soft devices for broad applications in medicine and engineering.
研究领域:
生物医学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 6
·1217
·
IF 4.2
Jingkai Nie,Hang Yin,Ruyue Cao,Changyuan Huang,Xiang Luo,Jun Ji
This paper developed a method for preparing ultrasound-responsive microgels based on reversible addition fragmentation chain transfer-hetero Diels–Alder (RAFT-HAD) dynamic covalent bonding. First, a styrene cross-linked network was successfully prepared by a Diels–Alder (DA) reaction between phosphoryl dithioester and furan using double-ended diethoxyphosphoryl dithiocarbonate (BDEPDF) for RAFT reagent-mediated styrene (St) polymerization, with a double-ended dienophile linker and copolymer of furfuryl methacrylate (FMA) and St as the dienophile. Subsequently, the microgel system was constructed by the HDA reaction between phosphoryl disulfide and furan groups using the copolymer of polyethylene glycol monomethyl ether acrylate (OEGMA) and FMA as the dienophore building block and hydrophilic segment and the polystyrene pro-dienophile linker as the cross-linker and hydrophobic segment. The number of furans in the dienophile chain and the length of the dienophile linker were regulated by RAFT polymerization to investigate the effects of the single-molecule chain functional group degree, furan/dithioester ratio, and hydrophobic cross-linker length on the microgel system. The prepared microgels can achieve the reversible transformation of materials under force responsiveness, and their preparation steps are simple and adaptive to various potential applications in biomedical materials and adaptive electrical materials.
研究领域:
材料科学
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生物医学工程
·
高分子化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Shengdu Yang,Keyu Lian,Pan Tian,Dianheng Lu,Junhua Zhang
Although numerous strategies refer to dynamic covalent bond exchanges of small molecules for self-repairing thermosets, it remains a critical challenge to be able to jointly tune the malleability and dynamic properties of photocurable materials via extending dynamical small molecule bridging chains with tunable kinetic features. Herein, we successfully synthesized two typical diboronic ester molecules (diboronic ester dithiol/diacid) with variable dioxaborolane metathesis kinetics, which acted as dynamical interlinking segments constructing simple hydrogenated bisphenol A (HBA) epoxy backbone to achieve dynamically cross-linking feature. Subsequently, the acrylate- and anhydride-modified HBA vitrimers bearing diboronic ester-extending segment variants and photocuring traits are successfully synthesized by a one-pot reaction. Consequently, it is demonstrated that the embedded amounts of dynamic diboronic ester bonds in the backbone play a key role in the photopolymerization rate of photocurable vitrimers. The photopolymerization rate decreases significantly as more diboronic ester segments. Moreover, the diboronic ester dithiol-mediated photocurable vitrimer (HBA-S) exhibits enhanced malleability (strain at break of 26.6 %), desirable photo-crosslinked network, and accelerated thermal-triggered self-healing ability (scratch self-healing efficiency of closing to 100 % at 150 °C), compared to those of the diboronic ester diacid-mediated vitrimer (HBA-O) under identical conditions. This work validates the probability of transferring the dioxaborolane metathesis of small molecules to dynamic properties of bulk UV-curing materials, which provides valuable guidance for the rational design and fabrication of tunable dynamic photocurable materials.
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
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Xiang Ye,Shengqi Jiang,Wei Niu,Rong Bai,Chunjie Yang,Siying Wang,Ziwei Li,Linlu Zhang,Huiyu Han,Jing Xi,Wu Ding
The influence of electron beam irradiation (EBI) treatment on the modification of gelatin-galactose glycosylation was thoroughly examined. The results of the degree of grafting and browning revealed that EBI triggered the glycosylation reaction of gelatin. The degree of glycosylation exhibited a gradual increase with the rising irradiation dose, reaching a maximum of 25 kGy. Moreover, the irradiation process opened up gelatin's internal structure, exposing its hydrophobic groups. This exposure led to an enhancement in sample surface hydrophobicity. The fluorescence intensity at the maximum emission wavelength of the fluorescence spectra decreased; Fourier infrared spectroscopy demonstrated a new absorption peak at 1074 cm −1 for the glycosylation product. These findings substantiate that gelatin formed a new product through covalent bonding with galactose. Glycosylation boosted the emulsification stability of gelatin from 1.92 min to 10.42 min and improved its emulsification and rheological properties. These outcomes affirm that EBI can effectively induce the glycosylation reaction of gelatin, thereby enhancing its functional properties. In addition, EBI has the potential to supplant the conventional heating glycosylation method. This study lays a solid theoretical foundation for the future application of glycosylation and gelatin.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2021
·
IF 8.528
Chongchong Yang,Dandan Zhu,Chengyuan Sun,Buyun Chen,Yinghao Li,Indra Neel Pulidindi,Zhen Zheng,Xinling Wang
A more facile and more efficient self-healing strategy for carbon fiber/thermoset resin interphase was established based on electrothermal effect of carbon fiber (CF) driving the reversible transformation of covalent bonds . Diels-Alder cycloaddition adduct was introduced into the CF/epoxy (EP) interphase region to endow the interphase with thermoreversible covalent bonds through the oxidative co-polymerization and chemical surface grafting, which was nondestructive but more efficient. The modified carbon fiber was characterized via SEM , AFM, XPS and TGA. The CF/EP interphase temperature range in CF reinforced polymer composites (CFRPs) was adjusted through controlling the electric current applied to CFs according to the thermo-sensitivity of CF. The effect of electrothermal effect on the matrix resin around CFs was measured by micro-FTIR. The interfacial shear strength (IFSS) measurement verified that the electrothermal effect promoted the reversible transformation of the Diels-Alder cycloaddition adducts connecting the modified CFs with matrix resin, resulting in the self-healing behavior of the damaged interphase. This self-healing strategy not only can improve the interfacial adhesion of CFRPs without damages to the CF surface caused by the traditional oxidation modification methods, but also can reduce the possible heating aging and deformation of composites caused by convective thermal repairing methods. This strategy is a more efficient process.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2021
·
IF 4.089
Yanzi Ke,Xiangyu Yang,Qian Chen,Junqi Xue,Zhijian Song,Yuehong Zhang,Samy A. Madbouly,Ying Luo,Mei Li,Qingwen Wang,Chaoqun Zhang
The development of multifunctional polymeric materials from renewable resources is of foremost significance from a sustainable development perspective. In this work, a biobased epoxy monomer (EHCPP) with hard core structures and multi-arms was prepared from cardanol with hexachlorocyclotriphosphazene, followed by epoxidation with m-chloroperoxybenzoic acid (m-CPBA). Then, the epoxy polymer networks were prepared via the curing process of EHCPP with four thiol monomers of different thiol groups. The mechanical and thermomechanical properties, thermal stability, solvent resistance, recyclability characteristics, and optical behavior of the cardanol-based epoxy resins were systematically investigated. The results showed that four epoxy resins (EHCPP-2SH, EHCPP-3SH, EHCPP-4SH, and EHCPP-BDB) not only exhibited excellent solvent resistance in 10 wt % aqueous solutions of NaOH, HCl, and NaCl but also showed intrinsic fluorescence, while only the EHCPP-BDB epoxy resin showed phosphorescence behavior. Recyclability was observed in the EHCPP-BDB polymer network due to the presence of dynamic reversible boron ester bonds. These cardanol-based epoxy-thiol polymer networks open a pathway to explore potential biomass resources for high-performance multifunctional materials as a replacement for petroleum-based thermosets in various industrial applications.
研究领域:
材料科学
·
可持续发展
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2024
·
IF 8.1
Shengdao Wang,Zhongxin Dong,Siyu Zhong,Yuan Li,LiangLiang Pei,Shuwen Zhang,Han Feng,Guibin Wang
Achieving simple and efficient interfacial modification between carbon fiber and polyether ether ketone (PEEK) has been the pursuit of researchers. In this study, by comparing the nucleophilicity of various aromatic amines, a direct Schiff base reaction with polyether ether ketone (PEEK) has been achieved. Based on this, a “grafting-bridging” bifunctional diazonium salt containing a phenylethylamine structure was designed and synthesized to enhance the interfacial strength through covalent bonding without the use of sizing agents. The diazonium salt was grafted onto the surface of carbon fiber through electrochemical reduction, while the PEEK resin and phenylethylamine could achieve bridging through heat treatment, thus a PEEK/CF interface with enhanced covalent bonds was constructed. The reaction and conversion rate between phenylethylamine and PEEK resin were confirmed through IR and NMR. The successful grafting of the diazonium salt on the carbon fiber was determined through XPS and cyclic voltammetry. The bridging reaction on the surface of carbon fiber was verified through XPS and the use of 6F-PEEK with characteristic elements. As a result, the interfacial shear strength (IFSS) of the modified PEEK/CF interface reached 86.2 MPa, representing a 102.8 % improvement compared to the untreated interface of 42.5 MPa, fully demonstrating the excellent effect of the bifunctional diazonium salt.
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
危险品化学品经营许可证（带存储）